Instruction Manual

HMP230 SERIES
M210225en-B User's Guide
43
6.3.7. Others
6.3.7.1. Setting the averaging time
Disconnect the security lock jumper!
With command FILT the transmitter can be given the averaging time during
which the individual measurement samples are integrated to get an averaged
reading. The time can be set in seconds within the range of 0 - 1024 (0 = no
averaging time = factory setting).
• Select More in the main menu and select Filt in the More menu:
• Pressing ENT returns the program to the main menu without changing
the filtration time.
• If the filtration time needs to be changed, press CL; enter the new
filtration time with the arrow keys.
6.3.7.2. Setting the pressure for pressure compenstion of the
HUMICAP

sensor and for mixing ratio, wet bulb and
enthalpy calculations
The atmospheric pressure has an effect on mixing ratio, wet bulb temperature
and enthalpy. Therefore, accurate calculations can be achieved only when the
ambient pressure is taken into consideration. The pressure is used for pressure
compensation of the HUMICAP

sensor in order to ensure the best possible
measurement accuracy. If the process pressure differs from normal ambient
pressure, the value has to be entered in the transmitter memory when using the
transmitters HMP234 or HMP238. The pressure to be entered is the absolute
pressure in hPa or mbar (for pressure unit conversion, see Appendix 10).
NOTE
The pressure compensation takes place only with the
security lock jumper connected. If the security lock
jumper is not connected, the pressure compensation is
performed with the value 1013.25 hPa.