Vaisala GMP231 - Manual (Page 20)

User's Guide _______________________________________________________________________
18 ___________________________________________________________________ M211501EN-C
Background Gas Compensations
Compensation for background gas parameters are based on setpoint
values only, as GMP231 has no internal measurement for oxygen
concentration or humidity. The default setpoint values are as follows:
- Oxygen concentration: 19.7 %O
2
.
- Relative humidity: 93 %RH.
If background gas compensations are turned off, GMP231 uses the value
0% for both.
Probe Startup
When powered on, GMP231 starts up within 10 seconds. Measurements
from the outputs (digital and analog) become available during this time
but note that they will only reach specified accuracy after a one minute
warm-up period. For this reason, you should design the incubator’s
control system so that it does not rely on measurements from GMP231
during this time.
NOTE Specifically note that the CO
2
reading will rise to the correct reading as
the sensor’s infrared emitter achieves operation temperature.