Key facts
- Brand
- GFG
- Model
- ZD21
- Documents
- 2
- Languages
- EN
- Last added
- 2023-10-18
Start here
GfG ZD 21 Oxygen Transmitter Operations Manual
The GfG ZD 21 is an intelligent fixed gas monitoring transmitter designed for use with a GMA controller. It features an amperometric oxygen sensor based on a zirconia electrochemical pump cell, offering easy calibration, temperature compensation, and long sensor life. The device converts gas concentration into an electrical signal (0.2..1 mA or 4..20 mA) transmitted via a shielded cable.
Read onlineGfG ZD21 specifications
| Output Signal | 0.2 .. 1 mA or 4 .. 20 mA |
|---|---|
| Supply Voltage | 10…32 V DC |
| IP Rating | IP 54 |
All GfG ZD21 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
How do I check the electrical zero point of the ZD21?
After a 30-minute warm-up, measure the voltage at the test contacts; it should be approx. 200mV (0.2 mA or 4 mA output). Adjust using potentiometer A or via the GMA controller.
How do I adjust the sensitivity if it’s off?
Use a calibration adapter and test gas, then adjust via potentiometer A or recalibrate using the GMA controller’s interface.
How long does the transmitter need to warm up before checking sensitivity?
Allow approximately 15 to 30 minutes to warm up the transmitter before checking the sensitivity.
When should the protective cap on the sensor be removed?
The protective cap must be removed immediately prior to applying power to the transmitter.