14
Adjustment
1. Remove the sensor cap.
2. Note the immersion depth of the probe.
3. Screw the humidity container to the probe with a
suitable adapter.
4. Perform the adjustment at a constant temperature.
5. Wait to the end of the compensation period
(recommended: >6h).
6. Carry out adjustment. To do this, press the key for the
corresponding values (11.3 %RH or 75.3 %RH) and the
“Enable” key at the same time (see top drawing on
page 13).
Note
The adjustment period is at least 180 minutes at a
constant temperature of 25 °C.
Note
For the adjustment process, if a display is connected
(H1, H2, H3, H4, H5 or H6), please refer to the “Display”
instruction manual.
7. Push on OK button of the testo 400/650. Choose
menu ”probe”. Press OK again and choose menu
”Adjustment”. After a further push of the OK button the
humidity and temperature value of the testo 400/650 is
sent to Hygrotest. Humidity adjustment in the
transmitter is cancelled via ”Probe Reset” and set back
to previous values.
Now take off the cable between testo 400/650 and the
Hygrotest transmitter.
8. If you are using a display, re establish communication
between the display and the transmitter by pressing the
key briefly.
9. Close the transmitter and re establish connections.
Note
To ensure accuracy, use a regularly calibrated reference
instrument and precision humidity probe to carry out the
adjustment.
Note
An adjustment period of at least 60 minutes is advised
at a constant temperature of 25°C.
Note
Adjustment of the transmitter is possible from firmware
version 1.22 in the testo 650 or testo 400.
Adjustment with control and adjustment set
A 2-point humidity adjustment of the transmitter can be
performed using the control and adjustment set.
For other adjustment instructions, please refer to the
“Control and adjustment set” instruction manual.
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