Vaisala HM70 - Manual (Page 39)

Chapter 8 ___________________________________________________________ Other Functions
VAISALA _______________________________________________________________________ 37
Turning Sensor Preheat ON/OFF
The following applies only with humidity probes HMP75B, HMP76B
and HMP77B:
1. Open the MENU: press OPEN.
2. Select Functions , press .
3. Select Sensor Preheat, press START . Confirm the starting by
pressing YES.
4. Insert the probe to the process.
5. When sensor preheat is done, a display message tells that
operation is completed and the basic display with readings
returns.
Sensor preheat is taking about 4 minutes at maximum . During
that time there are no readings on a display. A message display
appears once in 15 seconds and it tells you the time required to
complete the sensor preheat. Sensor preheat symbol is
shown on upper left corner. Stabilization of the temperature can
take a few minutes.
You can make a shortcut to the sensor preheat function by
setting one shortcut key to refer sensor preheat function, see
page 25.