Determining The Probe Type; Differentiating Between Digital And Analog Sensors; Recognising A Digital Version; Recognising An Analog Version - testo 105679 Bedienungsanleitung

Differentiating between digital and analog sensors

Testo differentiates between digital/analog adjustment
and adjustment via the instrument.
Check which humidity probes or which measuring
instrument you are using.
1. Recognising a digital version-button adjustment
Two push-buttons can be seen on the board.
2. Recognising an analog version-potentiometer
adjustment
Two potentiometers can be seen on the board.
Humidity values can only be changed using a
screwdriver.
3. Recognising a probe which is to be adjusted
via an instrument
No openings in the housing, no buttons on the
board.

Procedure with

- humidity probes

Remove the protective sleeve or cover plugs from
the handle of the humidity probe. The handle must
be removed from probes with date of manufacture
08.84. The date of manufacture is engraved on the
connection plug of the cable.

- hand-held measuring instruments

Remove the caps from the humidity probe.

- humidity measuring transducers

Unscrew the four screws on the housing cover and
then remove cover.
If you have an analog version continue reading
the Instruction manual from page 19 onward.
12

Determining the probe type

The instruments testo 615/testo 625 can be newly
adjusted via a 1 point adjustment (75.3 %RH).
The probes and control and adjustment set should
be stored in a constant temperature range (20 to 30
°C) for approx. 12 hours prior to checking or adjust-
ment.
Never carry out an adjustment without a control
container.
1) Unscrew the lid of the adjustment containers
(75.3% RH). Insert probe in slot.
2.) After at least 70 minutes´ waiting time switch the
instrument to the adjustment mode (CAL) and
press the Hold button when CAL "YES" appears in
order to save the new adjusted value.
An adjustment time of miin 24 hours is needed for
the sword probe 0636.03xx.
Keep the HOLD key pressed when switching on the
instrument until text appears in the display.
Auto On ° C
HOLD HOLD
MAX/MI MAX/MI
Auto OFF ° F
Note:
If "CAL" flashes you can cancel the
adjustment via the "HOLD" key without
readjusting the instrument.
Press each sketched key once per ope-
rating step.
1) Reset to an adjustment point saved in
the factory
2) 1 point adjustment with known humidity

Digital adjustment

Humidity adjustment set 0554.0638
Digital adjustment
Procedure
Return
(Meas. val.)
HOLD
MAX/MI
CAL
% _
Return
(Meas. val.)
HOLD
MAX/MI
CAL flashes
% _
Return
NO 1)
HOLD
CAL flashes
MAX/MI
% _
Adjustment
YES 2)
HOLD
MAX/MI
CAL flashes
13