Vaisala GMP343 - Manual (Page 78)

User’s Guide ______________________________________________________________________
76 ___________________________________________________________________M210514EN-E
Effects of Temperature, Pressure, Relative
Humidity, and Oxygen
The temperature compensation of GMP343 is based on the built-in Pt1000
temperature sensor. The values of pressure, relative humidity, and oxygen
must be input by the user, if they vary from the default.
Temperature
* Always at least ±10 ppm CO
2
.
Temperature compensation is performed by an integrated Pt1000 element.
The specifications in the table above are valid when temperature change is
< 1 °C / min. If optics heating is in use, the > 500 ppm accuracy values
should be multiplied by a factor of 2.
Effect on accuracy without compensation (typ.): -0.35 % of reading / °C
Pressure
Effect on accuracy without compensation (typ.): +0.15 % of reading /hPa
Table 8 Effect of Temperature on Accuracy with Temperature
Compensation
CO
2
range options 0 ... 1000 ppm 0 ... 2000 - 5000 ppm 0 ... 2 %
Temperature °C (°F) Accuracy (% of reading)*
+10 ... +40 (+50 ... +104)
+40 ... +60 (+104 ... +140)
-40 ... +10 (-40 ... +50) ±1
±2
±3 ±1
±3
±3 ±2
±4
±5
NOTE Integrated pressure sensor is not included in GMP343.
Table 9 Effect of Pressure on Accuracy with Pressure
Compensation
CO
2
range option 0 ... 1000 ppm 0 ... 2000 ppm - 2 %
Pressure (hPa) Accuracy (% of reading)
900 ... 1050
700 ... 1300 ±0.5
±1 ±1
±2