EC22 O Transmitter

Transmitter for oxygen measurement with partial pressure sensor


If oxygen is to be monitored in applications with high helium concentration where other oxygen sensors show deviating results, the EC22 O transmitter is a reliable and economical solution. The EC22 O transmits measured values and status displays analogue (0.2-1 mA or 4-20 mA) or digitally (RS-485). In combination with GfG's proven controllers, installation in new gas detection systems as well as retrofitting in existing systems is possible.

The EC22 O detects oxygen by means of the electrochemical process (EC). The long-life partial pressure sensor measures the oxygen concentration accurately and in a measuring range from 0 to 35 vol.%, even in air containing helium. Automatic temperature compensation and linearization of the measurement signals ensure high measurement accuracy.

Device protection
The housing is protected against the ingress of dust and water (protection class: IP54). An optional weatherproof housing provides additional protection.

Communication and service
Signals are transmitted according to the analogue industrial standard (optionally 0.2-1 mA or 4-20 mA) or via the digital RS-285 interface (Modbus protocol). The transmitter indicates operating states via two status LEDs. Service and adjustments are carried out on site using the optional RC22 remote control (one-man adjustment). Test gas can be applied for function control with a flow-through adapter.


Key features at a glance:


General information:

  • measuring principle: Electrochemical (EC)
  • partial pressure sensor for oxygen in air containing helium
  • expected sensor life: 5 years
  • signal transmission: 0.2-1 mA / 4-20 mA / RS-485
  • protection class: IP54

Optionally available:

  • RC22 operating unit, weatherproof housing, flow adapter

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Extensions and accessories

Weatherproof housing

Weatherproof housing


Weatherproof housing for various transmitters
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Test gases

Test gases


You can find an overview of our test gases here
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Accessories EC22 O

Accessories EC22 O


Here you'll find the complete list of accessories for the EC22 O
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