Instrumentation

Edwards Active and Passive range of gauges and controllers

An Introduction to our range of Active, Passive and Digital Gauges & Controllers

Capacitance manometer gauges: the most accurate “active” gauges we offer

Edwards capacitance manometer gauge

Edwards capacitance manometer gauge

  • Accuracies of <1%
  • The ability to output a linear 0-10V signal or communicate via RS232

They are Electro-mechanical gauges using a ceramic membrane to form an electrode of a capacitor. 


Available in a number of temperature controlled variants, our Capacitance range can be integrated into many applications where accuracy is key.


Active gauges: a complete self-contained head & driver electronics in a compact unit

Active Gauge Range

Edwards active gauge range

  • Typically need 24 V dc
  • Provide a 0-10 V output that relates to the pressure. This output can be S-shaped or Linear depending on the chosen unit.
  • Check out the video for more

Low power

surface mount integrated circuit electronics = a decreased size

Long flexible cables

as the cable only contains a drive voltage and high voltage output signals rather than low voltage signals that could be prone to interference

Non-specific controllers

TIC and ADC can be used to control multiple gauges, no need to specify exact gauges to use at time of ordering

Digital gauges: eliminating the need for a separate controller

Edwards digital gauges range

Edwards digital gauges range

Digital gauges are similar to Active in that they are self-contained including driving electronics, however they take this one step further and eliminate the need for a separate controller.


The Digital gauges simply need a supply voltage in the range of 15 to 48Vdc and then are serial comms enabled, so can be directly interrogated via a PC or PLC using either RS232 or RS485 communications.

Reduced overall costs

No external controller needed

Compact and efficient units
Long standard flexible serial cables

Passive gauges: completely separate the measuring part from the driver electronics

Passive Gauge Range

Edwards passive gauge range

The head that is attached to the system only contains the items needed for the physical measurement and all other electronics is contained in the controller.


As such the controller and cable have to be specific to the desired gauge.

Gauge head less prone to interference

such as that from ionising radiation

Gauges and connectors can be more rugged

Suitable for industrial environments

Portable gauging: be free of cabling and power

P3 Portable Handheld Gauge

Edwards P3 portable handheld gauge

Portable gauging offers the opportunity to easily take spot measurement checks.


Thanks to it being mains power independent, the Edwards P3 handheld all-in-one measuring system is the essential device for:


  • On-site service calls
  • On the spot flexible checking 

Measurement Range

1200 to 5x10-4 mbar (7 decades)

Data logging

  • via USB interface or using the internal memory
  • store up to 2000 values
  • can be exported to PC

Battery powered

  • Standard 9 V battery
  • 12V a.c. adapter in the accessory pack

Pressure unit selectable

  • mbar
  • Torr
  • Pascal