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5.
OPERATING COMPONENTS
5.1
Circuit board
After removal of the housing cover, the following operating components on the circuit
board may be accessed to configure the transmitter to the desired settings:
1. Serial interface:
2. Current-/ voltage output:
6.
MAINTENANCE
6.1
Sensor cleaning
Do not touch or rub the sensing element during the cleaning process!
The best way to clean the sensor is to use an ultrasound cleaner. This is a commercially
available piece of equipment, which generates ultrasound vibrations in a small bath. The
cleaning agent in the bath should be 50% isopropyl alcohol + 50% distilled water.
Remove the filter cap from the tip of the sensing probe. This has to be done very carefully
in order to avoid damaging the humidity sensing element.
Hold onto the sensing probe and slowly stir the tip of the sensing probe in the ultrasound
bath for about 1 minute. The sensing element, the leads, the socket and about ½ an inch
of the stainless steel sensing probe should be immersed in the liquid.
If an ultrasound cleaning bath is not available, stir the sensor as described above in a
container with a mixture of 50% isopropyl alcohol + 50% distilled water for approx.
2-3 minutes. This procedure suffices for "normal soiling".
In the event of extreme soiling – which can be seen on the humidity sensing element with
the naked eye – continue the operation until the pollutants are dissolved.
After the cleaning procedure with isopropyl alcohol, stir the tip of the sensing probe in a
container with distilled water for about 30 seconds and then allow it to dry at room
temperature.
Warning:
!
It is strongly advised NOT to try cleaning the sensor by mechanical means, such as
rubbing the sensor with cotton material!
Important:
It is highly recommended to replace the filter cap with a new one after cleaning the
sensor.
Pin connector for serial interface cable (HA010604).
If the transmitter is switched from current to voltage output, using
the configuration software, the 2 jumpers must be positioned
accordingly:
for current signals:
13
1. serial interface
I
2. current-/voltage output
U
I
for voltage signals:
U
I
U
I
U
I
U
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