Differential Pressure Gauges

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. May be used with Hydrogen; order a Buna-N diaphragm, pressures must be less than 35 psi.

Switch setting is easy to adjust with large external knobs on the gauge face. Gauge 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.

This compact gauge is easy to read and can safely operate at total pressures up to 30 psig. 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 in by means of a blow-out membrane molded in conjunction with the diaphragm.

Employs an encapsulated sensing element for use with both liquids and gases at pressures to 500 psig (34 bar). Optional cast brass case is available for water or water based liquids. Two phototransistor actuated, DPDT relays are included for low/high limit control.

The direct reading scales eliminate troublesome conversions. The scales are brushed aluminum, coated with epoxy and the graduations are on both sides of the indicating tube. Special integral flow guides stabilize the float throughout the range to keep it from hunting or wandering in the bore. The float is highly visible against a white background.

Offers a complete pressure gauge with calibration capabilities. With a precise 0.05% full scale accuracy and large 5 digit resolution, this gauge can be used in critical industrial applications where precision is most important. This versatile gauge only requires one 9V battery or power adapter and can operate up to 5,000 working hours.

3 in 1 instrument possessing a digital display gauge, control relay switches, and a transmitter with current output. Is ideal for pressure, velocity and flow applications, achieving a 0.5% full scale accuracy on ranges from 0.25 to 100"w.c. Two SPDT control relays with adjustable dead bands are provided along with a scalable 4-20 mA process output.

3 in 1 instrument possessing a digital display gauge, control relay switches, and a transmitter with current output all packed in the popular Photohelic gauge style housing. Ranges of 5" w.c. and greater maintain 0.5% F.S. accuracy. Bi-directional ranges are also available.

Combines two SPDT control relays, 4 to 20 mA process output, and Modbus communications with a large, brightly backlit 4-digit LCD that can easily be seen from long distances. The electrical wiring is enhanced with detachable terminal blocks, and removable terminals allow you to easily wire the terminal block outside the housing and then attach it to the circuit board.

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. All models are factory calibrated to specific ranges.

Designed to measure and control positive, negative, or differential pressures consisting of non-combustible and non-corrosive gases. The gauge reading is independent of switch operation, and switching status is visible by LED indicators located on the front and rear of the gauge. Setpoints are adjusted with push buttons on the back of the unit.

Designed for determining the state of an inline filter. Determines the pressure drop on either side of a filter through its 1/8" female NPT pressure connections, and relates the value to one of three zones: clean, change, or dirty. Suited for filter applications, line loss, valve drop, and other applications where a simple indicator is needed.

Perfect for applications where corrosion resistance is necessary, these gauges are an economical choice where ambient corrosion and vibration are a concern. Features stainless steel case and ring for excellent protection from harsh processes, and are suitable for all fluids that are compatible with brass and bronze.