Background Gas Compensation - GMP252

GMP252 User Guide

Document code
M211897EN
Revision
D
Language
English (United States)
Product
GMP252
Document type
User guide

The probe does not have on-board oxygen or relative humidity measurement. However, oxygen and relative humidity readings from an external source can be used as setpoint values for compensation using Vaisala Industrial Protocol or Modbus. The default setpoint values are as follows:

  • Oxygen concentration: 0 %O2 or 21 %O2
  • Relative humidity: 0 %RH or 50 %RH

If background gas compensations are turned off, the probe uses the value 0 % for both.

In practice, when CO2 is measured at a ppm level, O2 and RH compensations have a very small effect on the accuracy of the measurement.