testo 105679 Bedienungsanleitung Seite 23

If the measuring unit does not supply the required dis-
play of 11.3 %RH ±2 %RH or 75.3%RH ±2%RH the
sensor must be adjusted.
Screw in probe in control container with 11.3%RH
(LiCl) until the stop.
Period of stabilization: 3 days.
Adjustment of potentiometer P1:
- Measuring transducer
Version 0 to 20 mA:
Current output to 0 mA
^
(= display 0%)
Version 4 to 20 mA
Current output to 0 mA
^
(= display -25%)
- Panel meter
Set display at "00.0".
Note:
The current signal cannot take on any negative
values. For your safety set the current slightly
higher than 0 mA (for example between 0 and
0.01 mA).
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Analog adjustment
Analog humidity measuring transducers
and panel meters
First adjustment
(zero point setting)
Analog adjustment
Second adjustment
(setting the gradient)
Screw probe in 75.3%RH (NaCl) control container
until the stop.
Period of stabilization: 3 days
Set the gradient with potentiometer P2:
- Measuring transducer
Version 0 to 20 mA:
current output at 12.80 mA
^
(= display 64%RH)
Version 4 to 20mA:
current output at 10.16 mA
^
(= display 38.50%RH)
Panel meter
Adjust display value to "64.0"
Set the gradient with potentiometer P1:
- Measuring transducer
Version 0 to 20 mA:
current output at 15.06 mA
^
(= display 75.3%RH)
Version 4 to 20mA:
current output at 16.05 mA
^
(= display 75.3%RH)
Panel meter
Adjust display value to "75.3".
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