Effect of environmental compensations - GMP231

GMP231 User Guide

Document code
Document type
User guide

GMP231 has various environmental compensations that improve its CO2 measurement accuracy. As the calibration and adjustment environment may differ from the actual measurement environment, you must make sure that the compensation settings are properly set. Here are some key points to remember:

  • Pressure and temperature compensations have a significant effect on accuracy. If you are using setpoint values instead of the values from built-in pressure and temperature sensors, make sure to correct the setpoints so that they corresponds to your calibration situation. Consider switching the compensations to use the internal sensors when calibrating, and then switching back when calibration and adjustment is done.
  • The effect of background gas compensations for humidity and oxygen may be significant when using calibration gases, since they are often dry and oxygen-free. For example, pure nitrogen gas is typically used as a convenient 0 ppm CO2 reference.
  • Remember to restore the normal compensation settings after completing calibration and adjustment. If you are integrating the calibration functionality of the GMP231 as part of the incubator’s control software, also implement proper handling of the environmental compensations.