ZD22 Transmitter

Transmitter for selective long-term monitoring of oxygen

If oxygen is to be monitored selectively and over a long period of time, the ZD22 transmitter is a reliable and economical solution. The ZD22 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 ZD22 detects oxygen using a zirconium dioxide (ZD) sensor that is insensitive to ambient conditions and sensor poisons. The long-life sensors make the ZD22 an economical solution for detecting oxygen in measurement ranges such as 0 to 1,000 ppm or 0 to 96 % by volume. Automatic temperature compensation and linearisation of the measurement signals ensure high measurement accuracy.

Functional safety and device protection
The hardware of the ZD22 complies with the European Functional Safety Standard DIN EN 61508-2: 2011 (SIL). 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 calibration adapter.

Key features at a glance:

General information:

  • measuring principle: zirconium dioxide (ZD)
  • for oxygen
  • expected sensor lifetime: 4-5 years
  • signal transmission: 0.2-1 mA / 4-20 mA / RS-485
  • protection class: IP54

Approvals / Certifications:

  • SIL 2/3 (hardware)

Optionally available:

  • RC22 operating unit, weatherproof housing, calibration adapter


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 ZD22

Accessories ZD22

Here you'll find the complete list of accessories for the ZD22
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