Issue
TAC Xenta 120, up to version 1.08, CO2 input as 2-10 Volt
Environment
- Xenta 121-FC ver 1.08 and earlier
- Xenta 121-HP ver 1.08 and earlier
Cause
The input is designed for 0-10 volt signal and will be offset by 20% if a 2-10 volt sensor is applied.
Resolution
When 0-10V for input is used the 120 will multiply the voltage by the scale factor: V * S = CO2 reading.
When 2-10V for input is used the 120 will multiply the voltage by an adjusted scale factor: V * ((S*10) / 😎 = CO2 reading.
When using a 200ppm Scale factor this results in a reading of 600 ppm when reading 3V on a 0-10V input and 250 ppm when reading 3V on a 2-10V input.
This behavior is not correct, and needs to be corrected in a future release.