4 Transmitter
21
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4.3.1.5.
Plug-in connection for power supply and channel
M12 plug-in connection (5-pin) connector
View of the plug-in connection in the installed state from outside
PIN Assignment
1
-24 V
2 +24
V
3 +
Ch1
4 -
Ch1
5 PE
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4.3.2.
Adjusting the instrument
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4.3.2.1.
Init. phase during commissioning
In order to achieve the specified high accuracy down to -90°Ctd
and quick response times in case of dew point temperature
changes, the testo 6781 requires an initialization phase for
adjustment.
During this initialization phase any adsorbed moisture, which has
deposited in the sensor during transportation/storage and on all
surfaces of the compressed air system when opening and screwing
in the transmitter, is eliminated. During this time the testo 6781
should be subjected to at least 2 self-adjustment cycles (see Self-
adjustment page 22).
In order to achieve an adjustment as quickly as possible, the testo
6781 has an automatic initialization phase, which is configured
according to target dew point temperature. The factory setting
assumes a dew point range from -20° to -60°Ctd. The following
steps are recommended after the mechanical installation of the
instrument and a stable state of the compressed air system has
been reached.
Residual moisture in the compressed air system has a
negative effect on the measuring results. The following
times only apply for completely demoisturized compressed
air systems. Otherwise longer adjustment times must be
expected.