What it is
An electric contact pressure gauge shows the pressure like any dial gauge, and also switches an electrical circuit when the pressure reaches a set point. One or two set pointers can be adjusted across the scale.
It combines a local reading and a pressure switch in one instrument.
How it works
The set pointers are adjusted from the front of the gauge. When the main pointer reaches a set pointer, the contact opens or closes the circuit. Common contact types are magnetic snap-action, sliding and inductive contacts; the wiring is brought out through a terminal box and cable gland.
Where it is used
- Starting and stopping pumps and compressors
- Low and high pressure alarms
- Interlocks on hydraulic and pneumatic systems
- Boilers, fire-fighting and water systems
- Filter and process monitoring with alarms
Things to consider
- Tell us the number of set points and whether each contact should open or close on rising pressure.
- Tell us the switching voltage and current, so we can choose the right contact type.
- Tell us if the gauge is for a hazardous area.
- A glycerine fill steadies the pointer but must suit the contact type; ask us.
What to tell us for a quote
- Dial size and pressure range (bar, kg/cm², psi, kPa)
- Connection type and size
- Material of the wetted parts
- The medium and its working temperature
- Contact type, number of set points and rating (contact gauges)
- Quantity
Questions about electric contact pressure gauges
How does an electric contact pressure gauge work?
Adjustable set pointers mark the switching points. When the main pointer reaches one, the built-in contact opens or closes an electrical circuit, for an alarm, pump or compressor.
Can it replace a pressure switch?
For many alarm and control duties, yes, and it also gives a local reading. For safety-critical trips, follow the instrument specification for your plant.
Not sure this is the right gauge?
Answer up to 5 quick questions and the Gauge Finder suggests the right one from our range.
Need electric contact pressure gauges?
Send us the range, medium and connection and we will quote.