Pressure & Differential Instruments

We offer magnehelic differential pressure gauges which run on air and non-combustible compatible gases and are offered with the option of natural gas. In addition to this, these housing are fabricated by using die cast aluminum case and bezel, with acrylic cover. These have exterior finish with grey color to withstand 168 hour salt spray corrosion test.

Specifications :

• 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 bar to 1.034 bar); MP option:
• HP option: 35 psig (2.41 bar), 80 psig (5.52 bar).
• Overpressure: Relief plug opens at approximately 25 psig (1.72 bar), standard gages only.
• 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
• 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).
• Other position orientations.

Offering a wide range of quality intensive pressure transducer also known by the name wet differential pressure transmitter, these are reckoned across the globe for their reliable readings and apt functions. 
 
Specifications :

• Accuracy: linear signals.
• Total of linearity, hysteresis and repeatability, < /- 0.5 % fs at 2 x nominal pressure.
• Temperature influences: linear signals, Medium and ambient temperature -15 °C to 80 °C, TC zero point see order code selection table, TC sensitivity (% fs/K).
• Load cycle: < 50 Hz.
• Dynamic response: Suitable for static and dynamic measurements.
• Response time: < 5 ms
• Signal Power supply:
  • 0 – 5 V 11 – 33 VDC
  • 24 VAC /- 15%
  • 3-wire cable
  • 0 – 10 V 18 – 33 VDC
  • 24 VAC /- 15%
  • 3-wire cable
  • 4 – 20 mA 11 – 33 VDC
  • 2-wire cable
• Short circuit-proof and protected against polarity reversal. Each connection against other with max. /- supply voltage
• Load
  0 – 5 V > 10 k Ohm
  0 –10 V > 10 k Ohm
  4 –20 mA < [Ohm]
• Current consumption: At maximum signal output:
  0 – 5 V < 5 mA
  0 – 10 V < 5 mA
  4 – 20 mA < 25 mA
• Electrical connections: Protection standard Cable 1.5 meters, IP 65, with cable gland (threaded).

We offer precision engineered range of differential pressure switches that are known for their reliable readings and effectiveness. These are subjected to several quality tests so as to ensure they offer accurate readings. Additionally these are available in the following specifications:
 
Specifications :

• Wetted Materials: Diaphragm Material: Silicone. Housing Material: switch body: PA 6.6; Cover: Polystyrene.
• Temperature Limits: Process ambient temperature from -4 to 185°F (-20 to 85°C).
• Pressure Limits: Max. Operating Pressure: 40” W.C. (10 kPa) for all pressure ranges.
• Switch Type: Single-pole double-throw (SPDT).
• Repeatability: ±15% FS.
• Electrical Rating: Standard: Max., 1.5A/250 VAC,
• Max. Switching rate: 6 cycles/min.;
• Gold Contact Option: 0.4 A/ 250 VAC.
• Electrical Connections: Push-on screw terminals. M20x1.5 with cable strain relief or optional 1/2?? NPT connection.
• Process Connections: 5/16?? (7.94 mm) outside diameter tubing, 1/4?? (6.0 mm) inside diameter tubing.
• Mounting Orientation: Vertically, with pressure connections pointing downwards.
• Mechanical Working Life: Over 106 switching operations.
• Weight: 5.6 oz (160 g).
• Enclosure Rating: NEMA 13, IP54.

We offer superior quality and ruggedly constructed magnesense differential pressure transmitter that run on air and non combustible compatible gases.

Specifications :

• Accuracy: ±1% for 0. 25” (50 pa), 0. 5” (100 pa), 2” (500 pa), 5” (1250 pa), 10” (2 kpa), 15” (3 kpa), 25” (5 kpa) ±2% for 0. 1” (25 pa), 1” (250 pa) and all bi-directional ranges
• Stability: ±1% / year f. S. O.
• Temperature limits: 0 to 150°f (-18 to 66°c).
• Pressure limits: 1 psi maximum, operation; 10 psi, burst.
• Power requirements: 10 to 35 vdc (2-wire); 17 to 36 vdc or
• isolated 21. 6 to 33 vac (3-wire).
• Output signals: 4 to 20 ma (2-wire) or 0 to 10 v (3-wire).
• Response time: adjustable 0. 5 to 15 sec. Time constant.
• Provides a 95% response time of 1. 5 to 45 seconds.
• Zero & span adjustments: digital push button.
• Loop resistance: current output: 0-1250 ù max;
• Voltage output: min.
• Load resistance 1 kù.
• Current consumption: 40 ma max.
• Display (optional): 4 digit lcd.

Electrical connections : 

• 4-20 ma, 2-wire: european style
• Terminal block for 16 to 26 awg.
• 0-10 v, 3-wire: european style
• Terminal block for 16 to 22 awg.
• Electrical entry: 1/2” nps thread

Description:

Using solid state technology, the series 3000mr and 3000mrs photohelic® switch/gages combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage employing the durable, time-proven magnehelic® gage design. Switch setting is easy to adjust with large external knobs on the gage face. Gage reading is unaffected by switch operation - will indicate accurately even if power is interrupted. Solid state design now results in greatly reduced size and weight. Units can be flush mounted in 4-13/16" (122 mm) hole or surface mounted with hardware supplied. 3000mr models employ versatile electromechanical relays with gold over silver contacts - ideal for dry circuits. For applications requiring high cycle rates, choose 3000mrs models with spst (n. O. ) solid state relays. All models provide both low and high limit control and include 18-inch (45 cm) cable assemblies for electrical connections.

Gage accuracy is ±2% of full scale and switch repeatability is ±1%. Switch deadband is one pointer width - less than 1% of full scale. Compatible with air and other non-combustible, non-corrosive gases, they can be used in systems with pressures to 25 psig (1. 725 bar). Optional construction is available for use to either 35 psig (2. 42 bar) or 80 psig (5. 51 bar).

Included accessories: mounting ring, snap ring; 18" (45 cm) cable assembly; (2) 3/16" tubing to 1/8" npt adapters; (2) 1/8" npt pipe plugs; (4) 6-32 x 1-1/4" rh machine screws (panel mounting); and (3) 6-32 x 5/16" rh machine screws (surface mounting).

The dwyer series dm-2000 differential pressure transmitter senses the pressure of air and compatible gases and sends a standard 4-20 ma output signal. The dm-2000 housing is specifically designed to mount in the same diameter cutout as a standard magnehelic® gage. A wide range of models are available factory calibrated to specific ranges.

pressure connections are inherent to the glass filled plastic molded housing making installation quick and easy. Digital push-button zero and span simplify calibration over typical turn-potentiometers. An optional 3. 5 digit lcd shows process and engineering units. A single bush button allows field selection of 4 to 6 engineering units depending on range.

The atex approved series at2ms magnesense® differential pressure transmitter is an extremely versatile transmitter for monitoring pressure and air velocity in hazardous areas. This transmitter is loaded with features such as: field selectable english or metric ranges, field upgradeable lcd display, adjustable dampening of output signal and the ability to select a square root output for use with pitot tubes and other similar flow sensors. Along with these features, the magnetic sensing technology provides exceptional long term performance and enables the magnesense® transmitter to be the solution for a myriad of pressure and flow applications. Flame-proof atex enclosures are available in aluminum and can include a glass window for viewing process on the lcd.  

Important notes for installation: 
• Cables must be fitted through 1/2" npt cable gland or atex conduit (not supplied with instrument).  
• Make sure after cabling to close tight cover and cable gland, in order to keep ip66 rating (ip65 with option opv, overpressure relief valve).  
• Open cover only after de-energizing instrument.  
• Attention: check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.

The ISDP differential pressure transmitter provides a 4-20 ma process output, a robust nema 4x enclosure, plus a large lcd display that can be programmed to read in pressure, velocity or flow. The isdp offers simplified programming via a menu key that enables the user to select: security level; english or metric engineering units; pressure, velocity or flow operation, k-factor for use with various pitot tubes and flow sensors, circular or rectangular duct size for volumetric flow operation plus many more. The series isdp differential pressure transmitter is powered on its two wire loop with 10-35 vdc via its integral m-12 four pin male connector. The isdp provides a 0. 5% full scale accuracy on ranges from 0. 25" w. C. To 100" w. C. As well as bi-directional models up to 10" w. C. These features make the series isdp differential pressure transmitter the ideal instrument for monitoring pressures or air flows in hazardous zones having a class i div. I groups a, b, c, d; class ii div. I groups e, f, g; class iii div. I ratings.

Series HADP differential pressure transmitter combines low ranges with exceptional stability, reliability and an outstanding accuracy of ±0. 14% fs. All models come with nist certificates and are available in unidirectional and bi-directional ranges as low as 0 to 0. 5" w. C. And 0 to 5 psid. These transmitters are ideal for a variety of applications such as hvac control, leak detection, medical instrumentation, clean rooms, energy management, and environmental testing. With minimal thermal effects and the ability to withstand high overpressures, the series hadp transmitters are extremely stable allowing for use in the most demanding applications.

The series 616kd differential pressure transmitters with one-touch® technology are designed for simplicity making them the ideal choice for installers and maintenance professionals.

The one-touch® differential pressure transmitters are cost-effective, compact transmitters that reduce up front costs as well as expenses over the life of the product. These instruments not only alleviate cumbersome turn pots typically found in most transmitters, but eliminate entirely the need to span the instrument during calibration. With a single digital push button, both zero and span are calibrated properly, nothing else is required. No additional reference pressure sources and separate calibration devices are necessary; no need to remove from service and send to a lab. All that is required of the installer or user is to let the unit sit at zero reference pressure, then push a button. That is it! The transmitter is now ready for operation. Time savings are enormous over the life of the product compared to traditional transmitters which require time to annually remove the product from service plus the additional time to actually perform a complete full-span calibration.

Mounting is simple with integral mounting holes on the 616kd that are inherent to the molded housing. The 616kd has the expanded capability to be mounted on a 35 mm din rail either via its side or back integral din rail clips. The series 616kd has easy-to-wire open screw terminals at the top of the housing. An optional protective cap snaps directly to housing to cover terminals.

The one-touch® family of differential pressure transmitters are ideal for building automation applications such as air handlers, duct pressure, variable air volume and filter monitoring. Available models include ranges from 1 in w. C. To 20 in w. C. Depending on series.

The digimag® series dm-1000 digital differential pressure and flow gages monitor the pressure of air and compatible gases just as its famous analog predecessor the magnehelic® differential pressure gage. All models are factory calibrated to specific ranges. The 4-digit lcd can display readings in common english and metric units so conversions are not necessary. The simplified four button operation reduces set up time and simplifies calibration with its digital push button zero and span.

The digimag® digital gages are more versatile than analog gages with their ability to be field-programmed to select pressure, air velocity or flow operation depending on model. The digimag® digital gages have an added feature for filter applications where a set point can be input where the display will blink when the filter is dirty, alerting the user that a maintenance action needs to occur.

Programming the series dm-1000 is easy using the menu key to access 4 simplified menus which provide access to, depending on model: security level; engineering units; k-factor for use with various pitot tubes and flow sensors circular or rectangular duct size for volumetric flow operation; filter set point; view peak and valley process readings; digital damping for smoothing erratic process applications; display update to conserve battery life; zero and span field calibration.

The series dm-1000 digimag® digital differential pressure and air flow gages possess a full-scale accuracy of 1% on ranges down to 2 in w. C. And 2% accuracy down to the very low range of 1 inch to 0. 25 in w. C. Digimag® digital differential pressure gages offer power versatility by working with 9-24 vdc line power or simply 9v battery power. If using line power and connecting the 9v battery, the battery will act as a back-up if line power is lost or interrupted.

Combining clean design, small size and low cost with enough accuracy for all but the most demanding applications our Minihelic® II gage offers the latest in design features for a dial type differential pressure gage. It is our most compact gage but is easy to read and can safely operate at total pressures up to 30 psig. The Minihelic® II gage is designed for panel mounting in a single 2-5/8" diameter hole. Standard pressure connections are barbed fittings for 3/16" ID tubing; optional 1/8" male NPT connections are also available. Over-pressure protection is built into the Minihelic® II gage by means of a blow-out membrane molded in conjunction with the diaphragm. Accidental over-ranging up to the rated total pressure will not damage the gage. With removable lens and rear housing, the gage may be easily serviced at minimum cost.

With the housing molded from mineral and glass filled nylon and the lens molded from acrylic, the gage will withstand rough use and exposure as well as high total pressure. The 5% accuracy and low cost of the Minihelic® II gage make it well-suited for a wide variety of OEM and user applications. OEM applications include cabinet air purging, medical respiratory therapy equipment, air samplers, laminar flow hoods, and electronic air cooling systems. As an air filter gage, the Minihelic® II gage finds many end use applications on large stationary engines, compressors, ventilators, and air handling units. The Minihelic® II gage is suitable for many of the same applications as the Magnehelic® gage where the greater accuracy, sensitivity, and higher and lower differential pressure ranges of the Magnehelic® gage are not required.

The series 629 differential pressure transmitter monitors differential pressure of air and compatible gases and liquids with 0. 5% accuracy. The design employs dual pressure sensors converting pressure changes into a standard 4-20 ma output signal for two wire circuits. Small internal volume and minimum moving parts result in exceptional response and reliability. Terminal block zero and span adjustments are easily accessed under the top cover. The series 629 differential pressure transmitter is designed to meet nema 4x (ip66) construction.

The atex approved series at2ms magnesense® differential pressure transmitter is an extremely versatile transmitter for monitoring pressure and air velocity in hazardous areas. This transmitter is loaded with features such as: field selectable english or metric ranges, field upgradeable lcd display, adjustable dampening of output signal and the ability to select a square root output for use with pitot tubes and other similar flow sensors. Along with these features, the magnetic sensing technology provides exceptional long term performance and enables the magnesense® transmitter to be the solution for a myriad of pressure and flow applications. Flame-proof atex enclosures are available in aluminum and can include a glass window for viewing process on the lcd.

Important notes for installation: 
• Cables must be fitted through 1/2" npt cable gland or atex conduit (not supplied with instrument).  
• Make sure after cabling to close tight cover and cable gland, in order to keep ip66 rating (ip65 with option opv, overpressure relief valve).  series at2ms atex approved magnesense differential pressure transmitter
• Open cover only after de-energizing instrument.  
• Attention: check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.

Series 605 magnehelic differential pressure indicating transmitter.

The series 605 magnehelic® indicating transmitter provides for both visual monitoring and electronic control of very low differential pressure. The series 605 is ideal for control applications in building hvac systems where local indication is desired during routine maintenance checks or necessary when trouble shooting the system. The easily read dial gage is complimented by the two-wire, 4-20 ma control signal utilizing the time-proven dwyer® magnehelic® gage mechanical design and series 600 transmitter technology. The two-wire design with terminal strip on the rear simplifies connection in any 4-20 ma control loop powered by a 10-35 vdc supply.

Positive, negative and differential pressures can be measured within a full span accuracy of ±0.25 with the Series 616W Differential Pressure Transmitter. Units are enclosed in a polycarbonate case, rated NEMA 4X (IP66) and operate by sensing the pressure of air and compatible gases then sending a standard 4-20 mA output signal.

Design enables operation in 2-wire current loops. A wide range of models are available factory calibrated to specific ranges. The span and zero controls are for use when checking calibration. They are not intended for re-ranging to a significantly different span. The LCD (as shown to the left) allows local indication of pressure.

The series 610 low differential pressure transmitters are capable of measuring the pressures and flow of air or non-conducting gases at high resolutions. Designed specifically for clean rooms, isolation rooms, and other critical environments, the series 610 uses an improved all stainless steel micro-tig welded sensor to detect differential pressure and convert this pressure into a linear dc electrical signal by a unique electrical circuit. This unit is ideal for situations when accurate and reliable pressure monitoring is essential. Easy access pressure ports and electrical connections, removable process heads, and detachable terminal blocks make for fast and easy installation. The series 610 transmitters are available for air pressure ranges as low as 0. 1" w. C. Full scale. Standard accuracy is ±0. 5% on full scale (terminal-based) in normal ambient temperature environments. The tensioned sensor allows up to 2 psi overpressure in either direction with absolutely no damage to the unit. The series 610 transmitters can be ordered as either a base mount or a din rail mount and the option of a digital read out display. In addition, a calibration key can be ordered that allows the user to set zero and span. One key will work on multiple transmitters.

Series 677b differential pressure transmitters are designed to measure pressures as low as 0. 1 in w. C. With ±0. 4% accuracy. Use series 677b for building energy management systems, environmental pollution control, oven pressurization, lab and fume hood control, hvac and vav applications. The transmitter features 15 psid overpressure, reverse polarity protection and emi/rfi protection. Internal regulation permits use with unregulated dc power supplies. The nema 4 housing allows for versatile mounting locations and integral mounting tabs simplify installation.

Our low cost series 668 differential pressure transmitter is capable of measuring low pressures with a ±1% accuracy - ideally suited for proper building pressurization and air flow control. Transmitters can withstand up to 10 psig overpressure with no damage to the unit. Variable capacitance sensor design provides excellent sensitivity and long-term stability. Compact, lightweight design makes installation simple and easy. Units also feature reverse-polarity protection.

The series BDPA adjustable differential pressure alarm with built-in audible and visual set point indication is designed for overpressure, vacuum, and differential pressure applications. The scaled adjustment knob allows changes to the switching pressure to be made without a pressure gauge. The bdpa is available with settings from 0. 08" w. C. (20 pa) to 20" w. C. (5000 pa). The silicone diaphragm and pa 6. 6 body make the series bdpa perfect for use with air and other noncombustible gases.

The series BDPA adjustable differential pressure alarms offer a versatile range of configurations allowing utilization of their many features. The bdpa can be powered by battery or 24 vdc/vac line power. If connecting line power, the battery can act as back-up power in case of power outage. When set point threshold is reached, a local loud audible buzzer and bright led will indicate periodically notifying of set point activation. An spdt contact may also be wired to send a signal remotely to a ddc or building management system. A snooze button located through an opening in the cover can be pressed by the user to manually disengage the audible and visual indication until a maintenance operation is performed. If the instrument is mounted where it is difficult to access, a remote contact may be connected allowing the user to deactivate the buzzer and led at the remote contact location.

the series bdpa differential pressure alarms great functional versatility makes it perfect for filter, fan, and ventilation applications or any retrofit job where installing electrical wiring proves cost-prohibitive.

The series dh3 digihelic® differential pressure controller is a 3 in 1 instrument 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% full scale accuracy on ranges down to the extremely low 0. 25" w. C. To 2. 5" w. C. Full scale. Ranges of 5" w. C. And greater maintain 0. 5% f. S. 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.

The digihelic® controller just got better with the new series dhii differential pressure controller. The dhii takes all the fabulous features of the standard digihelic® pressure controller and packages them in a robust nema 4 (ip66) housing. The digihelic® ii pressure controller combines the 2 spdt control relays, 4-20 ma process output and modbus® communications with a large, brightly backlit 4 digit lcd display that can easily be seen from long distances. The electrical wiring has also been enhanced in the dhii with its detachable terminal blocks. The removable terminals allow the install to easily wire the terminal block outside the housing and then attach to the circuit board, reducing wiring difficulties and installation time on the process. The digihelic® ii differential pressure control in the new nema 4 (ip66) enclosure enables this product to be the perfect choice when mounting pressure controls outdoors in such applications as rooftop air handlers. This housing also makes it the ideal solution for surface mounting in clean rooms or facilities where water or a cleaning solution is utilized in maintaining plant cleanliness.

Model 1950 explosion-proof differential pressure switch combines the best features of the popular dwyer® series 1900 pressure switch with an integral explosion-proof and weatherproof housing, making it an exceptional value for either application. It is ce, ul and csa listed, fm approved for use in class i, div 1, groups c and d, class ii groups e, f, and g and class iii hazardous atmospheres nema 7 & 9. Raintight nema 3 (ip54). Weatherproof features include a drain plug and o-ring seal in cover. Electrical connections are easily made by removing front cover. For convenience the set point adjustment screw is located on the outside of the housing. Twelve models offer set points from . 03 to 20" w. C. (7. 5 to 5 kpa) and from . 5 to 60 psi (0. 035 to 3. 5 bar). The unit is very light and compact - about half the weight and bulk of other explosion-proof or weatherproof switches with separate enclosures. Caution: for use only with air or compatible gases. Applications with hazardous atmospheres and a single positive pressure may require special venting.

The model 1950g explosion-proof switch combines the best features of the popular dwyer® series 1950 pressure switch with the benefit of natural gas compatibility. Units are rain-tight for outdoor installations, and are ul listed for use in class i, groups a, b, c, & d; class ii, groups e, f, & g and class iii atmospheres, directive 94/9/ec (atex) compliant for ce atex ii 2g exd iib+h2 t6, csa & fm approved for class i, div. 1, groups b, c, d; class ii, div. 1, groups e, f, g and class iii atmospheres iecex ex d iib+h2 t6 (-40°c < ta < +60°c). The 1950g is very compact, about half the weight and bulk of equivalent conventional explosion-proof switches.

Easy access to the spdt relay and power supply terminals is provided by removing the top plate of the aluminum housing. A supply voltage of 24 vdc, 120 or 240 vac is required. A captive screw allows the cover to swing aside while remaining attached to the unit. Adjustment to the set point of the switch can be made without dis-assembly of the housing.

Essential for industrial environments, the series 1800 combines small size and low price with 2% repeatability for enough accuracy for all but the most demanding applications. Set point adjustment inside the mounting stud permits mounting switch on one side of a wall or panel with adjustment easily accessible on the opposite side. Ul and csa listed, and fm approved. Series 1800 low differential pressure switch for general industrial service.

Caution: for use only with air or compatible gases.

The series dx is a differential pressure switch that makes a contact output based on the differential between two pressure sources. Wetted materials of brass and flouroelastomer are suitable for use with most gases and water based solutions. The switch can be used for low differential pressure indication with set point on a decrease of pressure as low as 1 psid (0. 07 bar). Differential set point ranges are available from 2. 5 to 75 psid (0. 17 to 5. 17 bar) on increasing differential pressure and 1. 0 to 67 psid (0. 07 to 4. 62 bar) on decreasing differential pressure. Unit features a high static pressure rating of 200 psig (13. 8 bar) for higher static pressure applications. Standard is a weatherproof, ul type 4x, enclosure for dust laden, outdoor, or wash-down installation environments. Series dx incorporates an externally adjustable set point, integral mounting flange and a removable electrical terminal block for quick and easy installation. The dx uses opposing diaphragms to sense the high and low pressure with a pivot mechanism that transfers the difference of the two pressures to the spdt switch.

Explosion-proof, heavy duty, industrial unit has a unique new design which provides 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 pressure switches that use a piston-type motion transfer, the series h3 utilizes a rotary motion transfer shaft that prevents a change in total pressure from causing a setpoint shift. Unit yields deadbands approximately 5% of range, with zero setpoint shift due to variation in working pressures. Friction is minimized and repeatability increased by allowing range spring to act directly on diaphragm plate. Rolling diaphragm design maintains constant effective area to further reduce friction. Diaphragm is allowed to "seat", allowing application of full rated pressure, up to 1500 psi (103 bar), on either high or low pressure port, without damage. Special over-travel feature prevents overtightening of range adjust screw. Choose optional 316ss chamber for water and water-based fluids or harsher applications.