美国Dwyer差压开关
Dwyer Series WDPM 无线差压模块安装和操作指南说明书
Series WDPM Wireless Differential Pressure Module to Models UHH and UHH2 or the Dwyer Mobile Meter ® app to view pressure drop across filters, static pressure in ducts, and velocity pressures from pitot tubes or air flow stations. When using it with a pitot tube or air flow measuring station, the measurement read directly in air velocity or volumetric mounts in the holder on the back of the handheld, or in an optional mounting bracket.Wireless modules can take measurements from at least 50 feet away from the base on the top of the module to let the CHARGING BATTERYWhen the charge of the battery is almost used up, the LED on the module of the wireless probe will turn solid red. There is approximately 5 minutes of battery life left at this point. If the module is not already paired to the base unit, it will not pair while in low battery condition.Step 1: Plug the mini-USB connector end of the cable into the top of the module.Step 2: Plug the USB connector end of the cable into the port on the charger or PC (LED on the charger and the module should both light up).Step 3: The LED on the module will turn off when fully charged.Step 4:Remove USB cable from the module and the charger or PC.Cet appareil est conforme à des règlements d’Industrie Canada exempts de licence standard RSS (s). Son fonctionnement est soumis aux deux conditions suivantes: (1) Ce dispositif ne doit pas causer d’interférences nuisibles, et (2) cet appareil doit accepter toute interférence reçue, y compris les interférences pouvant entraîner un fonctionnement indésirable.This Class B digital apparatus complies with Canadian ICES-003.Cet appareil numériqué de la classe B est conformé à la norme NMB-003 du Canada.It is required before the initial use of the module to fully charge the battery for 12 hours.If desired, it can be operated with USB powered cables less than 3 m in length when connected to the charger or PC.Table 1Lithium ion batteries are very volatile and can cause a fire if punctured or severely damaged. Only use a Dwyer Instruments,Inc. approved charging device in a well ventilated area away from any flammable materials or gases. Do not incinerate the battery. Only charge between 32 to 113°F (0 to 45°C).USING WITH UHHPairing with Wireless Probes1. Turn on Model UHH Universal Handheld by pressing the button.2. Press the and buttons to scroll through the menu headings at the top of the display.3. When PROBE is highlighted, hit the button to access the probe menu.4. Press the directional arrow to scroll through the sub-menu headings. Thecurrent selected parameter will be highlighted in yellow.5. When PAIRING MODE is highlighted, hit the button to access the pairing mode.6. Turn on the wireless probe(s) to be paired. After a period of up to 15 to 20seconds, the UHH screen will update with the information about the wireless probe(s) just turned on.7. Press the button to scroll through the available probes. The current selectedprobe will be highlighted in yellow.8. When the desired probe to be paired is highlighted, hit the button to pair theprobe. Once it is paired, it will be removed from the list automatically.9.Once all the desired probes are paired, press button.10. Repeat step 9 to go back to the home screen and begin readings.USING WITH UHH2 OR MOBILE METER® APPPairing with Wireless ProbesFor the latest instructions, please refer to the “Help” button in the Options menu in the Mobile Meter® app.1. Verify that the UHH2 or handheld device has Bluetooth® technology turned on andis connected to the wireless gateway. Open the Mobile Meter® app by clicking on the icon.2. Press “Get Started”.3. Near the bottom, a pop-up will display a message that reads “Bluetooth issearching for bridges...”. When a bridge is turned on and discovered by MobileMeter® the pop-up will display “Mobile Meter has CONNECTED to the Bluetooth device: PROBEBRIDGE_XXXXXX” where XXXXXX is the probe’s serial number.4. Click on the Options menu and select “Setup”.5. In the Setup page, probes can be discovered and paired to the Mobile Meter®app. After the Mobile Meter® app connects to a bridge, a probe can be discovered.To discover a probe, simply turn on the probe by pressing the button on the handle and it will show up in the Setup list.6. Use the back button or navigation arrow to go back to the Probes List page.WIRELESS GUIDELINES IN ACCORDANCE WITH FCC:Changes not expressly approved by Dwyer Instruments, Inc. could void the user’s authority to operate the equipment.This product complies with FCC OET Bulletin 65 radiation exposure limits set forth for an uncontrolled environment.Pursuant to FCC 15.21 of the FCC rules, changes not expressly approved byDwyer Instruments, Inc. might cause harmful interference and void the FCC authorization to operate this product.Canadian Government Guidelines:Operation is subject to the following two conditions: (1) This device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation.INFORMATION TO THE USERPower Output: 6 mWOperating Frequency: 2.4 GHzOperating Channel: 11Operating Mode: IEEE 802.15.4, Zigbee, Direct Sequence Spread SpectrumData Rate: Up to 250 kbpsIntended Use: Industrial/commercial HVACAntenna Connection: Internal only, non-tunableBattery Removal:If, for some reason, the wireless probe needs to be returned to Dwyer Instruments, Inc. for maintenance or repair, the rechargeable lithium ion battery needs to be removed prior to shipping the unit. Before attempting to remove the battery ensure the probe has been powered down. To remove the battery, set the wireless probe face down on a non-abrasive surface. There are four Phillips head screws that secure the two halves of the handle together. Two are located under the serial number label at the top of the probe and two are located at the bottom of the unit. When lifting the ends of the serial label to access the screws be careful to not damage the label such that the serial number cannot be read. Remove the four screws with a suitable Phillips screw driver and set aside the back half of the housing. Remove the battery by grasping the black plastic connector on the battery wire harness and pull straight out while securing the black plastic connector on the circuit board with the other hand. Be careful to not puncture the battery as this may cause a fire. Remove the battery and set aside. Securely replace the four screws to hold the handle of the probe together. The unit may now be packaged for shipping back to Dwyer Instruments, Inc. MAINTENANCE/REPAIRUpon final installation of the Series WDPM, no routine maintenance is required. The Series WDPM is not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.WARRANTY/RETURNRefer to “Terms and Conditions of Sales” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair. Be sure to include a brief description of the problem, plus any additional application notes.Bluetooth®is a registered trademark of Bluetooth SIG This symbol indicates waste electrical products should not be disposedof with household waste. Please recycle where facilities exist. Check withyour Local Authority or retailer for recycling advice.If a module does not appear, power the module down, then powerit back on.It is recommended that only four probes be selected due to thebandwidth limitations between the UHH2/Mobile Meter® app andthe gateway.Printed in U.S.A. 2/19FR# 444099-00 Rev. 4©Copyright 2019 Dwyer Instruments, Inc.。
Honeywell 低功耗开关技术简介说明书
LOW ENERGY SWITCHINGGeneral Technical Bulletin #13 - Low Energy Switching2 Honeywell Sensing and Controle of ContentsPageINTRODUCTION (3)LOW ENERGY SWITCHING (3)MECHANICAL PERFORMANCE (4)Plunger Movement Characteristics (4)Plunger Force vs. Plunger Position................................................................. 5 Circuit Terminology (5)ELECTRICAL PERFORMANCE (6)Insulation Resistance..................................................................................... 6 Dielectric Strength......................................................................................... 6 Switch Resistance......................................................................................... 6 Contact Resistance....................................................................................... 7 Load Resistance........................................................................................... 7 Measurement of Switch Resistance................................................................ 7 Switch Resistance in Application................................................................... 8 Role of Contamination in Switch Resistance................................................... 9 Common Contact Materials..........................................................................10 Common Contact Configurations...................................................................11 Switch Life (12)GENERAL APPLICATION GUIDELINES .....................................................13 Storage, Installation, and Maintenance...........................................................13 Design..........................................................................................................14 Environment.. (15)SUMMARY (15)General Technical Bulletin #13 - Low Energy SwitchingFor application help: call 1-800-537-6945 Honeywell Sensing and Control 3INTRODUCTIONIn today’s age of low energy control, electromechanical switches are more frequently interfacing directly with computers and other low energy driven hardware. Switching low energy loads presents a unique challenge as compared to switching higher energy loads and at times requires an alternative switch design.The purpose of this bulletin is to provide general information about mechanical and electrical performance of electromechanical switches, along with application guidelines for using electromechanical switches in low energy applications.LOW ENERGY SWITCHINGLow energy switching can be described as using a switch to control any component(s) of a circuit where the load that the contacts will switch will not cause an arc to form between the contacts. Common names for these types of circuits are thermocouple load, dry circuit, logic level, etc.The primary concern in the area of low energy switching is contact contamination. Since low energy loads do not arc or burn the contact surface, they also do not arc or burn off the contaminants that may reside on the contact surface. These contaminants may cause erratic switch resistance and can stop current flow. Pay special attention to the General Application Guidelines if the switch is to be used in a low energy application.General Technical Bulletin #13 - Low Energy Switching4 For application help: call 1-800-537-6945 Honeywell Sensing and ControlMECHANICAL PERFORMANCEPlunger Movement Characteristics of a Basic SwitchFree Position: Switch plunger is fully released and common contact is against normally closed contact.Pretravel: Distance from free position to operating point.Operating Point: Common contact transfers from normally closed contact to normally open contact.Overtravel : Distance plunger travels past operating point.Full Overtravel Point : Point at which further plunger depression is prevented by switch mechanism.Release Point: Common contact transfers from normally open contact to normally closed contact.Differential Travel: Distance between operating point and release point.Operating Force: Force required to depress switch plunger to operating point.Full Overtravel Force: Force required to depress switch plunger to full overtravel point.Release force: Force required to allow the plunger to return to release point.The movement of the switch plunger from the free position through the release point is considered one cycle of switch operation.General Technical Bulletin #13 - Low Energy SwitchingFor application help: call 1-800-537-6945 Honeywell Sensing and Control 5Plunger Force vs. Plunger PositionThe graph at the right represents the relationship between plunger travel and plunger force and is of interest when the mechanism used to operate the switch is a force-sensitive device such as a dead weight, a thermostatic bimetal or a gas-filled bellows.For data on a specific switch type, contact the- MICRO SWITCH Application Center at 1-800-537-6945.Circuitry TerminologyPole : The number of completely separate circuits that can pass through the switch at one time.Throw: The number of different circuits that each pole can control.Break: The number of pairs of separated contacts the switch introduces into each circuit it opens.General Technical Bulletin #13 - Low Energy Switching6 For application help: call 1-800-537-6945 Honeywell Sensing and ControlELECTRICAL PERFORMANCEInsulation Resistance Applied voltage divided by the current is the electrical resistance of the insulation. For new switches at commonly used voltages, insulation resistance usually exceeds 100,000 megohms between non-connected terminals and between terminals and switch housing. The voltage does put an electrical stress on the material but does not damage it unless the potential exceeds the dielectric strength of the switch.Dielectric Strength Dielectric strength is the highest electrical potential that an insulating material can withstand without breaking down, i.e., dielectric breakdown. New switches usually have dielectric strength of over 1000 volts with leakage current less than 500 microamps. When the voltage exceeds the dielectric strength, the insulating material is permanently damaged.Insulation Resistance and Dielectric StrengthSwitch Resistance Switch Resistance is the total resistance of the conducting path between the wiringterminals of the switch.Sources of Switch ResistanceGeneral Technical Bulletin #13 - Low Energy SwitchingFor application help: call 1-800-537-6945 Honeywell Sensing and Control 7Typical Pattern of Switch Resistance versus Plunger Position at 6 Volts DC, 0.1 AmpereContact Resistance : The resistance between a pair of closed contacts.Load Resistance : Load resistance affects contact resistance in the following way; if the circuit voltageexceeds the softening or melting voltage of the contact material, the material softens or melts due to I 2R heating. See table below for softening and melting voltage of silver and gold.MaterialApproximateSoftening VoltageApproximate Melting VoltageSilver .09 Volt .37 Volt Gold.08 Volt.43 VoltIf the metal at the contact interface softens or melts, the cross-sectional area of the conducting path between the contacts will depend upon the current. The size of this cross-sectional area determines contact resistance. The higher the current, the greater the cross-sectional area of the bridge and the lower its resistance. If the softening voltage is not reached, the contact resistance is independent of current.Measurement ofSwitch Resistance: Switch resistance should be measured by voltage drop using the same voltage andcurrent as in the circuit in which the switch is to be used. This can be accomplished by connecting the switch in a series circuit consisting of a power supply of the specified voltage, a variable resistor and ammeter.General Technical Bulletin #13 - Low Energy SwitchingConnections for Measurement of Switch ResistanceSwitch Resistancein Application: In the application of snap-acting switches, if the source voltage is at least .5 volts, contact material almost always softens, or melts slightly, at the interface, and switch resistance becomes afunction of current. This leads to the following practical consequences:1. In low current circuits, switch resistance tends to be relatively high. However, low current circuitsusually have high resistance load components. The resistance of the switch usually is such a smallpart of the total resistance of the circuit that switch resistance is not a problem.2. High current circuits usually have low-resistance load components. In high current circuitshowever, switch resistance tends to be low. Again, the resistance is such a small part of the totalresistance of the circuit that switch resistance is not a problem.At source voltages of 0.5 volt or greater, the resistance of a switch during its life will rarely exceed1% of the load resistance. If source voltage is less than 0.5 volt, switch resistance may or may notbe a function of current, depending upon the amount of the source voltage that appears across thecontacts.In general, the maximum allowable switch resistance of a specific application can be defined asfollows: For DC circuits, the maximum allowable switch resistance equals the line voltage divided by the minimum allowable current, minus the load resistance. For AC circuits, the maximum allowable switch resistance equals the line voltage divided by minimum allowable current, multiplied by thepower factor and minus the load resistance.8 For application help: call 1-800-537-6945 Honeywell Sensing and ControlGeneral Technical Bulletin #13 - Low Energy SwitchingFor example, consider a switch in series with a relay coil:• 24 VDC, 5000 ohm coil, operate .004 amp, release .0025 amp.• Without the switch in the circuit, I=.0048• With the switch in circuit, coil will operate at I=.004. Switch resistance will do no harm if it does not reduce the .0048 amp to less than .004 amp• Total resistance that will allow .004 amp flow = R = V/I = 24 volts/.004 amp = 6000 ohms• Therefore, maximum allowable switch resistance = 6000 ohms - 5000 ohms or 1000 ohmsRole ofContamination inSwitch Resistance:There are two general classifications for switch contaminants, particles and films. Particles can becrushed solids that enter the switch during application or assembly. Particles deposit on the contact surface, are crushed between the contacts and can become embedded in the contact material due to contact force. Particles can cause erratic contact during wipe and roll of contacts and, if large orextensive enough, can stop current flow.Films are the second type of switch contaminant, which can be broken into two parts, organic andinorganic. Inorganic films, such as silver oxides or silver sulfides, do not typically cause switchresistance problems at the contacts. Silver oxide is conductive, so it does not represent a problem.Silver sulfide films are brittle and are punctured mechanically due to contact force and wiping action.There are several types of contaminants that can create organic films and cause resistance problems.The most common are flux, organic vapors, and silicones. Flux enters the switch cavity by vapor or is carried into the switch cavity by a cleaning solvent. Flux will increase switch resistance and can stop current flow. To avoid flux contamination: avoid use of activated flux; use flux sparingly; use flux core solder; do not allow liquid flux or flux vapor to enter the switch; use a soldering temperature ofapproximately 550° F (288° C); and, do not use solvents on or near switches - they carry flux residue and other contaminants into the switch. It is not necessary to remove flux residue from terminals.Organic materials, especially organic vapors, can decompose in the arc or I2R heating of the material at the interface between the closed contacts. Carbonaceous deposits can build up over time on thecontact surface and increase the switch resistance.For application help: call 1-800-537-6945 Honeywell Sensing and Control 9General Technical Bulletin #13 - Low Energy SwitchingSilicon is an inorganic element found in many materials. Silicone is an organic material commonlyfound in oils, greases, mold release, cleaning sprays, and potting material. Silica (SiO2), commonly referred to as glass, is transformed from silicone in the presence of electrical energy. Silicones enter the switch as vapor and over time, based on load, rate of actuation, and amount of silicone present, transform into silica. These silica deposits can raise switch resistance and stop current flow. Everyprecaution should be taken in the application to prevent silicone from coming in contact with the inner switch cavity.Common ContactMaterials:• Fine silver. 1.6 ohms/cm, low cost, if kept clean, there is no lower load limit.• 24 karat gold.2.36 ohm/cm, high cost, limited to use in applications with little or no arc energy because of its ductility.• Gold Alloys.Different properties depending on the alloy.• Gold clad over silver.If the load is low energy, it is carried through gold. If the load is arcing, it burns away the gold and is carried through silver contacts. However, a switch that has seen anarcing load should not be used for a low energy load.• Silver Cadmium Oxide.Designed for use in power loads, not recommended for use in loads less than .5 amp and/or 12 volts.The following graph can be used as a general guide for the selection of contact material. The graph indicates 1st choice, 2nd choice, etc. for each current range. Note, the current represented on the X axis is steady-state. Inrush currents from motor loads and lamp loads can be 6 to 10 times steadystate current.General Guide to the Selection of Contact Material10 For application help: call 1-800-537-6945 Honeywell Sensing and ControlFor application help: call 1-800-537-6945 Honeywell Sensing and Control 11 Common ContactConfigurations:Smooth contact. Common contact configurationSerrated contact. The top surface of the contact can be serrated toprovide a series of peaks and valleys. When the switch is operated theraised areas (peaks) tend to scruff or scrape over the mating contactsurface. This self-cleaning discourage buildups of films or particulate foreignmaterial on the raised areas. Even when the minute particles are not totallyremoved, they tend to drop into the valleys where they are less likely tocontaminate the contact interface. Serrated contacts have been effective inimproving electrical continuity in applications ranging from power duty loadsto low current requirements.Bifurcated contacts. The most effective system developed to date.Bifurcated contacts offer some of the same benefits as described forserrated contacts in addition to providing parallel redundancy.Redundancy can also be provided by connecting two or more switches inparallel and actuating them at the same time.NOTE : Not all contact configurations are available on all switch types.For more information regarding the availability of different contactconfigurations on specific switch types, contact the HONEYWELLApplication Center at 1-800-537-6945.12 For application help: call 1-800-537-6945 Honeywell Sensing and ControlSwitch Life: Mechanical life: The life of a switch with no electrical load present.Electrical life: The life of a switch when switching an electrical load.The following graph demonstrates the life of switch at different electrical loads. Switch life depends on such criteria as electrical load, environment, switch mechanism, and other factors particular to the application. As electrical load increases, switch life decreases. Below 1 amp, the electrical life approaches the mechanical life of the switch. For available test data, contact the HONEYWELL Application Center at 1-800-537-6945.GENERAL APPLICATION GUIDELINESStorage, Installation,and Maintenance• Store switch in a clean, reasonably dry environment that does not exceed the rated temperature of the switch.• Install the switch carefully:♦ Do not drill, sand or otherwise modify the switch.♦ Do not overtighten mounting screws. Review packing sheet instructions carefully.♦ If mounting the switch with an adhesive, use extreme care to avoid contaminating the switch interior.♦ Avoid the use of silicone materials to prevent silicone from coming in contact with the interior of the switch. If this is not possible, in low energy applications, use a sealed switch.♦ When soldering leads to terminals, use non-activated flux core solder and a soldering temperature of about 550° F (288° C).♦ Do not use solvents on switches.♦ Do not use commercial contact cleaners on snap-action switches.♦ Do not paint over switch after installation.♦ Do not connect opposite polarity between normally open and closed terminals. When this is done, and when the arc persists after the contacts are fully apart, a short circuit is establishedthrough the arc and hence through the switch.• Chemicals used during maintenance cleaning can degrade switch materials. If the switch cannot be easily removed prior to cleaning and the types of chemicals used for cleaning are known,contact the HONEYWELL Application Center at 1-800- 537-6945 fo r fluid compatibilitydata.For application help: call 1-800-537-6945 Honeywell Sensing and Control 13Design• For advice regarding the choice of a switch for a specific application, contact the HONEYWELL Application Center at 1-800-537-6945.• If low price is an important factor, silver contacts may help reach the objective.• All snap acting electromechanical switches have contact bounce. When the contact closes it bounces, causing the switch to open and close for a period of microseconds before stayingclosed. If contact bounce will be a problem, the circuit must be buffered. The circuit can bebuffered with additional electronic circuitry or with software.• If the load is below melting voltage, gold or gold alloys can be used for an added measure of safety.• Actuate the switch as closely as possible to the extremes of its plunger travel without applying excess force that might damage the switch. For force data, contact theHONEYWELLApplication Center, 1-800-537-6945.• Decide, based on accurate technical information, whether a switch resistance specification is needed and whether its additional cost is justified. If so, on the basis of end use, specify: thevoltage, current, plunger position, sequence of actuation, and measurement, and maximumallowable switch resistance.• When to give switch resistance special attention:♦ When the switch controls a circuit at less than 0.5 volts.♦ When several switches must be connected in series.♦ When a switch is likely to be exposed to contaminating particles or fumes.♦ When an occasional switch closure with the switch resistance exceeding 1% of the load resistance will have negative consequences.• Design the circuit so the switch sees voltage well above the softening voltage of the contact material, e.g., 0.08 volt for gold, 0.09 volt for silver.• Design low voltage circuits with a minimum number of switches in series.• Design the switch circuit to be as insensitive to normal variations of switch resistance as possible.14 For application help: call 1-800-537-6945 Honeywell Sensing and ControlIf additional assurance of low and stable resistance is desired, use bifurcated contacts or connect two or more switches in parallel and actuate them at the same time.Customers should test the switch under conditions simulating end use to verify that it performs asrequired in the application.Environment• Protect unsealed switches from contamination by particles and fumes.• Switches can be sealed to help prevent contamination from entering them. Some common levels of sealing are: dust resistant, drip-proof, water resistant, resilient, and hermetic. In general, themore critical the application and the harsher the environment, the more stringent the sealrequirements.• If the switch is unsealed and a low energy load is involved, a thorough understanding of the environment is required to choose the correct contact material and configuration. Contact theHONEYWELL Application Center at 1-800-537-6945, for help in choosing the propermaterial• If the environment of an unsealed switch contains a significant amount of sulfides (such as decaying organic matter, cardboard, or vulcanized rubber) and moisture, gold or gold-plated contacts canhelp.• If an alien film contaminant (such as paint spray or oil mist) can reach the contacts, gold won't help. Use a sealed switch.SUMMARYContact material, contact configuration, and the degree of environmental protection are importantconsiderations when low energy switching is required. They must be considered, along with otherapplication variables, to determine the proper switch for the application. The most reliable and cost-effective solution to any switch application results from a partnership between the user andHoneywell’s Sensing and Control Division.For further technical information and assistance in determining your total switching requirements,contact HONEYWELL:1-800-537-6945 USA1-800-737-3360 Canada1-815-235-6847 InternationalFAX1-815-235-6545 USAINTERNET********************.comFor application help: call 1-800-537-6945 Honeywell • MICRO SWITCH Sensing and Control 15Helping You Control Your World Honeywell Inc.11 West Spring StreetFreeport, Illinois 61032001008-3-EN IL50 GLO 797 Printed in USA。
Dwyer Magnehelic 压力差表说明说明书
VISIT OUR WEBSITES: • • .auMountingA single case size is used for most models of Magnehelic ®gages. They can be flush or surface mounted with standard hardware sup plied. With the optional A-610Pipe Mounting Kit they may be conveniently installed on horizontal or vertical 1-1/4˝ - 2˝ pipe. Although calibrated for vertical position, many ranges above 1˝ may be used at any angle by simply re-zeroing. However, for maximum accuracy, they must be calibrated in the same position in which they are used. These characteristics make Magnehelic ®gages ideal for both stationary and portable applications. A 4-9/16˝ hole is required for flush panel mounting. Complete mounting and connection fittings plus instructions are furnished with each instrument.Vent Valvesn applications where pressure is continuous and the Magnehelic ®gage is connected by metal or plastic tubing which cannot be easily removed, we suggest using Dwyer A-310A vent valves to connect gage. Pressure can then be removed to check or re-zero the gage.High and Medium Pressure ModelsInstallation is similar to standard gages except that a 4-13/16˝ hole is needed for flush mounting. The medium pressure construction is rated for internal pressures up to 35 psig and the high pressure up to 80 psig. Available for all models. Because of larger case, the medium pressure and high pressure models will not fit in a portable case size.I nstallation of the A-321 safety relief valve on standard Magnehelic ®gages often provides adequate protection against infrequent overpressure. See Note.Select the Dwyer ®Magnehelic ®gage for high accuracy — guaranteed within 2% of full scale — and for the wide choice of 81 models available to suit your needs precisely. Using Dwyer's simple, frictionless Magnehelic ®gage movement, it quickly indicates low air or non-corrosive gas pressures — either positive, negative (vacuum) or differential. The design resists shock, vibration and over-pressures. No manometer fluid to evaporate, freeze or cause toxic or leveling problems. It's inexpensive, too.The Magnehelic ®gage is the industry standard to measure fan and blower pressures,filter resistance, air velocity, furnace draft, pressure drop across orifice plates, liquid levels with bubbler systems and pressures in fluid amplifier or fluidic systems. It also checks gas-air ratio controls and automatic valves, and monitors blood and respiratory pressures in medical care equipment.Note:May be used with hydrogen. Order a Buna-N diaphragm. Pressures must be less than 35 psi.SPECIFICATIONSService: Air and non-combustible, compatible gases (natural gas option available).Wetted Materials:Consult factory.Housing: Die cast aluminum case and bezel, with acrylic cover. Exterior finish is coated gray to withstand 168 hour salt spray corrosion test.Accuracy: ±2% of full scale (±3% on - 0, -100 Pa, -125 Pa, 10MM and ±4% on - 00,-60 Pa, -6MM ranges), throughout range at 70°F (21.1°C).Pressure Limits: -20˝ Hg to 15 psig† (-0.677 to 1.034 bar); MP option: 35 psig (2.41 bar); HP option: 80 psig (5.52 bar).Overpressure: Relief plug opens at approximately 25 psig (1.72 bar), standard gages only. See Overpressure Protection Note on next page.Temperature Limits: 20 to 140°F* (-6.67 to 60°C).Size: 4˝ (101.6 mm) diameter dial face.Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.Process Connections: 1/8˝ female NPT duplicate high and low pressure taps - one pair side and one pair back.Weight: 1 lb 2 oz (510 g), MP & HP 2 lb 2 oz (963 g).Standard Accessories: Two 1/8˝ NPT plugs for duplicate pressure taps, two 1/8˝pipe thread to rubber tubing adapter and three flush mounting adapters with screws.(Mounting and snap ring retainer substituted for 3 adapters in MP & HP gage accessories.)*Low temperature models available as special option.†For applications with high cycle rate within gage total pressure rating, next higher rating is recommended. See Medium and High pressure options at lower left.Series 2000Magnehelic ®Differential Pressure GagesIndicate Positive, Negative or Differential, Accurate within 2%OPTIONS AND ACCESSORIESFlush, Surface or Pipe MountedTransparent OverlaysFurnished in red and green to highlight and emphasize critical pressures.Adjustable Signal FlagI ntegral with plastic gage cover. Available for most models except those with medium or high pressure construction. Can be ordered with gage or separate.Add suffix -ASF to end of gage model numberLED Setpoint IndicatorBright red LED on right of scale shows when setpoint is reached. Field adjustable from gage face, unit operates on 12-24 VDC. Requires MP or HP style cover and bezel. See Note.Add suffix -SP to end of gage model numberCALL TO ORDER: U.S. Phone 219 879-8000 • U.K. Phone (+44) (0)1494-461707 • Australia Phone (+61) (0) 2 4272 20555Quality design and construction featuresO-ring seal for cover assures pressure integrity of case.OVERPRESSURE PROTECTIONBlowout plug is comprised of a rubber plug on the rear which functions as a relief valve by unseating and venting the gage interior when over pressure reaches approximately 25 psig (1.7 bar). To provide a free path for pressure relief, there are four spacer pads which maintain 0.023 inch clearance when gage is surface mounted. Do not obstruct the gap created by these pads.The blowout plug is not used on models above 180 inches of water pressure, medium or high pressure models, or on gages which require an elastomer other than silicone for the diaphragm.The blowout plug should not be used as a system overpressure control. High supply pressures may still cause the gage to fail due to over pressurization, resulting in property damage or serious injury. Good engineering practices should be utilized to prevent your system from exceeding the ratings or any component.Die cast aluminum case is precision made and iridite-dipped to withstand 168 hour salt spray corrosion test. Exteriorfinished in baked dark gray hammerloid. One case size is used for all standard pressure options, and for both surface and flush mounting.Silicone rubber diaphragm with integrally molded O-ring is supported by front and rear plates. It is locked and sealed in position with a sealing plate and retaining ring. Diaphragm motion is restricted to prevent damage due to overpressures.Samarium Cobalt magnet mounted at one end of range spring rotates helix without mechanical linkages.Bezel provides flange for flush mounting in panel.Clear plastic face is highly resistant to breakage. Provides undistorted viewing of pointer and scale.Precision litho-printed scale is accurate and easy to read.Red tipped pointer of heat treated aluminum tubing is easy to see. It is rigidly mounted on the helix shaft.Pointer stops of molded rubber prevent pointer over-travel without damage.“Wishbone” assembly provides mounting for helix, helix bearings and pointer shaft.Jeweled bearings are shock-resistant mounted;provide virtually friction-free motion for helix. Motion damped with high viscosity silicone fluid.Zero adjustment screw is conveniently located in the plastic cover, and is accessible without removing cover. O-ring seal provides pressure tightness.Helix is precision made from an alloy of high magnetic permeability. Mounted in jeweled bearings, it turns freely, following the magnetic field to move the pointer across the scale.Calibrated range spring is flat spring steel. Small amplitude of motion assures consistency and long life. It reacts to pressure on diaphragm. Live length adjustable for calibration.Series 2000 Magnehelic ® Gage — Models and RangesPage VI shows examples of special models built for OEM customers. For special scales furnished in ounces per square inch, inches of mercury, metric units, square root scales A-299, Surface Mounting Bracket A-300, Flat Flush Mounting Bracket A-310A,3-Way Vent Valve A-321, Safety Relief Valve A-432, Portable Kit A-448, 3-piece magnet kit for mounting Magnehelic ®gage directly to magnetic surface A-605, Air Filter Kit A-610, Pipe Mount KitOPTIONS — To order, add suffix: I.E. 2001-ASF ASF,Adjustable Signal Flag HP ,High Pressure Option LT,Low Temperatures to -20°F MP ,Med. Pressure Option SP ,Setpoint Indicator Scale Overlays,Red, Green, Mirrored or Combination, Specify Locations。
Dwyer 三相差压开关说明说明书
Explosion-proof,heavy duty, industrial unit has patented and unique new design whichprovides sensitivity to differential pressures as low as 10 inches of water (254 mm w.c.),yet handles total pressure of 1500 psi (103 bar). Unlike common differential pressureswitches that use a piston-type motion transfer, the Series H3 utilizes a rotary motiontransfer shaft that prevents a change in total pressure from causing a setpoint shift. Unityields deadbands approximately 5% of range, with zero setpoint shift due to variation inworking pressures. Friction is minimized and repeatability increased by allowing rangespring to act directly on diaphragm plate. Rolling diaphragm design maintains constanteffective area to further reduce friction. Diaphragm is allowed to “seat”, allowingapplication of full rated pressure, up to 1500 psi (103 bar), on either high or low pressureport, without damage. Special overtravel feature prevents overtightening of range adjustscrew. Choose optional 316SS chamber for water and water-based fluids or harsherSPECIFICATIONSWetted Materials: See pressurechamber and diaphragm material inmodel chart.Temperature Limit: -4 to 220°F(-20 to 104°C), ATEX: -20 to 90°C(-4 to 194°F).Pressure Limit: 1500 psig (103 bar).Enclosure Rating: Standard meetsNEMA 4X (IP56), drain option meetsNEMA 3 (IP54). For hazardous usesee the hazardous location ratingsElectrical Rating: 5A @ 125/250 VAC,30 VDC.Electrical Connections: See modelchart.Conduit Connection: 3/4˝ femaleNPT.Process Connection: 1/8˝ femaleNPT.Mounting Orientation: Vertical.Set Point Adjustment:Internal screw.Weight: 4 lb, 2 oz (2 kg).Deadband:Approximately 5% of Note:Shown without housing and cover.CI. II, Gr.E, F & GCompliant0344II 2 G EEx d IIB-20°C≤ T amb ≤ 75°C T60344II 2 G EEx d IIB-20°C≤ T amb ≤ 75°C T6。
Dwyer Instruments 差压传感器说明书
B
Blind
O
Glass top cover
1
1/8˝ NPT female brass ports
2
1/8˝ NPT female SS ports
X
Standard without overpressure
relief valve
OPV Overpressure relief valve
Material same as ports
PRESSURE
Series AT2
ATEX
Approved
Magnesense® Differential
MS
Pressure Transmitter
Series MS in Flame-Proof ATEX Enclosure
Differential Pressure Transmitters
2 [50.00]
Series Output
Range
Mounting Display Housing
AT2MS -0 -1 -2 -3 -6 -7 -8 -9 -1 -2 -3 -4 -5 1 -LCD -A
Bidirectional, 4 to 20 mA Positive range, 4 to 20 mA Bidirectional, 0 to 10 VDC Positive range, 0 to 10 VDC Bidirectional, 0 to 5 VDC Positive range, 0 to 5 VDC Bidirectional, 0 to 5 VDC, 12 volt in Positive range, 0 to 5 VDC, 12 volt in 1, 2, 5 in w.c. (200, 500, 1000 Pa) .1, .25, .5 in w.c. (25, 50, 100 Pa) 10 in w.c. (2 kPa) 15 in w.c. (3 kPa) 25 in w.c. (5 kPa) With LCD Aluminum
dwyer ms121 ms111 ms321使用说明书美国德威尔
满量程对应的输出值
Model MS-X2X
MS-X1X
English Metric English
Low 0.1˝ w.c.
25 Pa 1˝ w.c.
Medium 0.25˝ w.c.
50 Pa 2˝ w.c.
Metric
250 Pa 500 Pa
Table 2
High 0.5˝ w.c. 100 Pa 5˝ w.c. 1250 Pa
图3 TB1的输出端Vo为0-10 VDC。其电流最大不超过10 mA。他要求接 收器的阻抗RL 不小于1 KΩ。请注意要保证传输线路的电阻一定要大 大小于接收器的阻抗RL。
当变送器输出端VO 在10mA下保持不变时，传输线路的电阻将会 导致接收器端的电压损失。对于1%精度的变送器来说，应保证该 电阻不超过RL 的0.1%。
安装使用说明： 安装方式 Magnesense®必须安装在一个与水平面垂直的平面上。同时， 压力连接孔及电线连接管必须方向朝下。 用三颗螺丝稳定固定在该平面上即可，不必过于拧紧。 如果选择其它安装角度，都会对精度造成较大损失。
产品特性
适用介质： 空气以及非易燃性气体，兼容性气体 接液材质：请咨询厂家 精度：0.5”&0.25”w.c.; ±1%；0.1”w.c.:±2%。100&50Pa:±1%; 25Pa:±2% 稳定性：±1%满量程/年 温度范围:0 to 150°F (-18 to 66°C). 压力极限：最大耐压：1 psi（连续），安全极限压力：10 psi 电源：10-35VDC（2 线）；17-36VDC 或隔离的 21.6-33VAC(3 线) 输出信号：4-20mA（2 线）；0-10V（3 线） LCD 反应时间：现场连续可调 0.5-15 秒；提供 1.5 到 45 秒的 95% 反应时间 零点和量程调节：数字输入键 回路阻抗：电流输出最大 0-1250 欧姆；电压输出最小负载 1000 欧姆 电力消耗：最大 40mA 显示（可选）：4 位数字 LCD 显示 电气连接：4-20mA，2 线：欧洲样式接线盒为 16 到 26 AWG；010V，3 线：欧洲样式接线盒为 16 到 22 AWG 电气接入端：1/2”NPS 接头 附件：适用于 5-10mm 直径的密封管 压力连接：3/16” (5 mm) ID 管，最大 OD 9mm。 防护等级：NEMA 4X. 安装方向：膜片垂直安装 重量：8.0 oz (230 g). 认证： CE，符合下列标准：
DWYER INSTRUMENTS 36型差压仪 开关、传感器说明书
VIDEO ON
LINE
1/8 FEMALE NPT HIGH PRESSURE
CONNECTION 1-1/4 [31.75]
1/8 FEMALE NPT LOW PRESSURE
CONNECTION
Shown with optional -SS bezel. Backward compatible+ with Magnehelic® gage.
The Series DH3 Digihelic® 3 Differential Pressure Controllers are 3-in-1 instruments possessing a digital display gage, control relay switches, and a transmitter with current output all packed in the popular Photohelic® gage style housing. Combining these 3 features allows the reduction of several instruments with one product, saving inventory, installation time and money. The Digihelic® controller is the ideal instrument for pressure, velocity and flow applications, achieving a 1.5% or better full-scale accuracy on ranges down to the extremely low 0.25 in w.c. to 2.5 in w.c. full-scale. Ranges of 5 in w.c. and greater maintain 0.5% FS accuracy. Bi-directional ranges are also available. The Series DH3 Digihelic® controller allows the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units. 2 SPDT control relays with adjustable deadbands are provided along with a scalable 4-20 mA process output. Programming is easy using the menu key to access 5 simplified menus which provide access to: security level; selection of pressure, velocity or flow operation; selection of engineering units; K-factor for use with flow sensors; rectangular or circular duct for inputting area in flow applications; set point control or set point and alarm operation; alarm operation as a high, low or high/low alarm; automatic or manual alarm reset; alarm delay; view peak and valley process reading; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your applications range and field calibration.
进口阀门十大品牌
进口阀门十大品牌一、品牌介绍进口阀门是指生产创造国外进口的阀门产品，具有高品质、可靠性和先进技术等特点。
下面将为您介绍进口阀门领域中的十大品牌。
二、品牌排名及介绍1. 瓦尔特（Walter）瓦尔特是一家德国知名的进口阀门品牌，成立于1921年。
该品牌以其高质量、高性能和创新的产品而闻名，产品包括球阀、蝶阀、闸阀等，广泛应用于石油、化工、电力等行业。
2. 古德威（Goodway）古德威是一家英国的进口阀门创造商，成立于1982年。
该品牌以其可靠性和耐用性而受到客户的青睐，产品涵盖了各种类型的阀门，如截止阀、调节阀等。
3. 法兰克（Frank）法兰克是一家瑞士的进口阀门品牌，创立于1896年。
该品牌以其精确的工艺和卓越的品质而享有盛誉，产品广泛应用于化工、石油、天然气等领域。
4. 罗克韦尔（Rockwell）罗克韦尔是一家美国的进口阀门创造商，成立于1903年。
该品牌以其先进的技术和创新的产品而闻名，产品包括控制阀、安全阀等，广泛应用于工业自动化领域。
5. 斯密特（Schmidt）斯密特是一家德国的进口阀门品牌，创立于1928年。
该品牌以其高性能和可靠性而受到客户的赞誉，产品包括截止阀、球阀等，广泛应用于石油、天然气等行业。
6. 阿克曼（Ackman）阿克曼是一家瑞典的进口阀门创造商，成立于1910年。
该品牌以其先进的技术和优质的产品而享有盛誉，产品涵盖了各种类型的阀门，如蝶阀、止回阀等。
7. 赫斯曼（Hessman）赫斯曼是一家德国的进口阀门品牌，创立于1892年。
该品牌以其卓越的品质和可靠性而受到客户的信赖，产品广泛应用于石油、化工、电力等领域。
8. 拜耳（Bayer）拜耳是一家德国的进口阀门创造商，成立于1863年。
该品牌以其丰富的经验和先进的技术而享有盛誉，产品包括截止阀、调节阀等，广泛应用于化工、石油等行业。
9. 基因斯（Kings）基因斯是一家英国的进口阀门品牌，创立于1975年。
该品牌以其高品质和可靠性而受到客户的好评，产品涵盖了各种类型的阀门，如球阀、蝶阀等。
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美国Dwyer差压开关
北京北方泰克自动化设备有限公司代码美国Dwyer差压开关（Dwyer A3000系列差压开关、Dwyer MRS3000差压开关）。
TECK/泰克仪表所销售的HUBA699 压差变送器为瑞士进口产品，公司备有常规型号，供货周期为即时发货。
如客户选购产品为特殊型号以及定制压力范围产品，供货周期为4-6周，特殊情况6-8周。
Dwyer3000MR型号采用了镀金纯银触点的多功能继电器，这种继电器非常适用于无源电路。
对于开关频繁的场合，选择带有双刀双掷固态继电器的3000MRS型号。
所有型号都提供低限和高限控制，并且包括18-inch（45cm）安装线缆。
差压表的精度是±2%满量程，开关重复性是±1%，开关死区为一个指针宽度—少于满刻度的1%。
它们与空气和其他的不易燃、无腐蚀气体兼容，可以用于差压达到25psig(1.725bar)的系统中。
对于35 psig(2.24bar)或80 psig (5.51bar)可另外定制。
Dwyer A3000面板是透明的聚碳酸酯塑料。
表针和遮光器被平衡安装在螺旋和平衡物上。
遮光器的光限制形状根据作用于自身的压力来控制内部红外线源射向光敏晶体管的光量。
光线保护板有效地保护光敏晶体管受外面光线的干扰，并且不影响指针自由的运动，同时也起到装饰作用。
塑料保护壳保护电子元件和电子连接。
双刀双掷的带闭锁的负载继电器，能够用于更多的应用场合。
典型的应用中这些Dwyer开关/表在高、低压设置点之间进行控制。
Dwyer差压开关常年备货型号：
A3000-00 0-0.25 A3201 0-1
A3000-0 0-0.50 A3202 0-2
A3001 0-1.0 A3203 0-3
A3002 0-2.0 A3204 0-4
A3003 0-3.0 A3205 0-5
A3004 0-4.0 A3210** 0-10
A3005 0-5.0 A3215** 0-15
A3006 0-6.0 A3220** 0-20
A3008 0-8.0 A3230*** 0-30
型号量程 (in.w.c.)最小刻度3000-0(MR)(MRS) 0-0.5 0.01 3001(MR)(MRS) 0-1.0 0.02 3002(MR)(MRS) 0-2.0 0.05 3003(MR)(MRS) 0-3.0 0.1 3005(MR)(MRS) 0-5.0 0.1 3010(MR)(MRS) 0-10 0.2 3015(MR)(MRS) 0-15 0.5 3020(MR)(MRS) 0-20 0.5 3030(MR)(MRS) 0-30 1
3050(MR)(MRS) 0-50 1
3100(MR)(MRS) 0-100 2
3000(MR)(MRS)-60Pa 0-60 2
3000(MR)(MRS)-125Pa 0-125 5
3000(MR)(MRS)-250Pa 0-250 5
3000(MR)(MRS)-500Pa 0-500 10 3000(MR)(MRS)-1KPa 0-1.0 0.02 3000(MR)(MRS)-3KPa 0-3.0 0.1 3000(MR)(MRS)-4KPa 0-4.0 0.1 3000(MR)(MRS)-6MM 0-6 0.2 3000(MR)(MRS)-10MM 0-10 0.5 3000(MR)(MRS)-25MM 0-25 0.5 3000(MR)(MRS)-50MM 0-50 1 3000(MR)(MRS)-100MM 0-100 2
注：以上为部分备货型号、详细请咨询TECK/泰克仪表。