GfG CS21 Transmitter Operation Manual

About this manual

This manual provides instructions for safely installing, calibrating, and maintaining the GfG CS21 gas transmitter. It covers mounting position, electrical connections, zero point and sensitivity checks, and troubleshooting. The CS21 uses chemosorption principle to convert gas concentration into 0.2–1 mA or 4–20 mA signals. Calibration and adjustments must be performed after warm-up and only with authorized methods or tools.

What's inside

• For your Safety
• General Description
• Detection Principle
• Operational Notes
• Design
• Mounting Position of CS21
• Mounting
• Installation of Electrical Connections
• Putting in Operation
• Check of Electrical Zero point

Specifications

Frequently asked questions

How do I check the electrical zero point of the CS21?

After a warm-up time of approx. 30 minutes, measure the voltage at the test contacts; it should be approx. 197 mV, corresponding to 4 mA output (4–20 mA interface).

What is the required warm-up time before checking the sensitivity of the CS21?

The chemosorption sensor requires a running-in time of approximately 15 to 30 minutes before you can check the sensitivity.

What voltage reading at the test contacts corresponds to an output current of 4 mA?

After the warm-up time, the signal must be approximately 197 mV, which corresponds to an output current of 4 mA.

What is the maximum length allowed for the connecting wire when using an external sensor?

The connecting wire for an external sensor must have a maximum length of 2 meters.