Overview
The EC22 O Transmitter is designed for oxygen monitoring, particularly in environments containing helium. It is part of the 22 series of transmitters by GfG Gesellschaft für Gerätebau mbH, which includes various models for different gases and applications.

Specifications
- Measuring Principle: Electrochemical (EC)
- Measuring Range: 0 to 35 vol% (configurable)
- Response Time: t90 ≤ 5 s
- Temperature Range: 0 to +50 °C
- Humidity: 0 to 90% relative humidity
- Air Pressure: 70 to 125 kPa
- Output Signal: Analog (0.2-1 mA or 4-20 mA), Digital (RS-485)
- Power Supply: 12 to 30 V DC
- Housing: Plastic, IP54 protection class
- Dimensions: 96 x 153 x 49 mm
- Weight: 310 to 390 g

Features
- Designed to monitor oxygen levels even in helium-rich environments using a partial pressure sensor.
- Compact housing suitable for wall mounting, protected against splash water and dust (IP54).
- Equipped with status LEDs for operational readiness and fault indication.
- Smart electronic system for temperature compensation and ease of operation and maintenance.
- Sensor lifespan is expected to be 5 years.

Communication
Signal transmission can be done via 4-20 mA industry standard or digital RS-485 interface (Modbus RTU), allowing integration with GfG controllers or higher-level process control systems.

22 Series Transmitters
The 22 series includes various models for monitoring different gases:
- CC22: Combustible gases
- CC22 ex: Combustible gases in Ex zone 2
- CS22: Refrigerants
- EC22: Toxic gases, H₂, and O₂
- IR22: Combustible gases and CO₂
- IR22 F: CO₂ in cold stores
- ZD22: O₂
These transmitters are available with or without display, push buttons, and buzzer.

Conclusion
The EC22 O Transmitter is a reliable and cost-effective solution for oxygen monitoring in challenging environments, particularly where helium is present. Its robust design and advanced features make it suitable for various industrial applications.