3.4.1 Temperature compensation
Temperature compensation is a functionality introduced in software version 1.1.0. The HMP7
probe supports probe heating. Probe heating heats up not only the sensor, but the entire
probe head and filter. When probe temperature is heated above dew point temperature,
condensation on the probe can be avoided while measuring the dew point temperature of the
process. The probe heating functionality in HMP7 can be activated either through
configuration code (set at the factory), or it can be activated using the Insight software and
service cable (Vaisala part number 242659 or USB-2).
Output parameters that are dependent on temperature measurement (such as relative
humidity) are unavailable whenever probe is heated unless the true temperature of the
measured environment is updated to the temperature compensation register of the HMP7
from the TMP1 probe. This happens automatically when both HMP7 and TMP1 are connected to
the transmitter and the temperature compensation function is enabled. If TMP1 is disconnected
and temperature compensation is not manually turned o, a NaN value is returned.
Disconnecting TMP1 will invalidate the temperature and relative humidity outputs of the
heated HMP7.
Temperature compensation setting is usable only when HMP7 is connected to probe 1
connection terminal and TMP1 is connected to probe 2 connection terminal. It does not aect
any other probe combinations. When the probes are connected, the temperature
compensation automatically turns on. The temperature output of HMP7 is equal to TMP1
temperature, when heating function is activated. Make sure HMP7 and TMP1 probes are in the
same environment to get the most accurate relative humidity measurement values.
The compensation can be manually turned o.
More information
‣
Disabling temperature compensation on touchscreen (page 83)
‣
Disabling temperature compensation in web interface (page 92)
Indigo510, Indigo520 User Guide M212287EN-N
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