ACO A
utomation
Co
mponents
Operating Instructions DMMS_DIGISYS
21
DMMS moisture sensor
•
The temperature inside the sensor housing may not exceed 80°C.
•
The sensor may not be installed in immediate proximity to vibrating discharge aids (i.e. vibrators).
•
When replacing sensors, do not cut separate away the connecting cable of the old sensor.
•
When filling the silo for the first time, ensure that the sensor is protected against stone chips.
•
Do not wedge the sensor in the wheel flange during installation. Otherwise, the sensor can fall out when
loads are applied.
•
The 3 countersink screws (a) and the tensioning screw (E) must be made of stainless steel.
5.4
Sensor servicing
5.4.1.
Daily tasks
•
Check the correct functioning of the measuring section(s).
•
The ceramic wear shield must be examined for damage and wear
•
Remove any adhesions from the wear shield.
•
Check that an even flow of material with sufficient over-layer (>50mm) is present.
•
The moisture measuring value must be verified through a laboratory test.
A sufficient quantity of material, representative of the mix, is extracted and at the same time the moisture
measuring value or the fraction value is recorded. If the deviations are too large, the calibration curves can
be adjusted (see PC software or display and parametering module).
5.5
Replacing the sensor
1.
Switch off the system and measuring system and secure against starting up again.
2
Open the bus connection socket, loosen the cable clamp and unclamp the sensor cable.
3
First loosen the fastening (B) and then loosen the straining screw (E) until the mounting flange releas-
es the sensor.
4
Install a new sensor in the mounting flange, adjust and tighten the straining screw (E).
5
Tighten the fastening (B).
6
Clamp the sensor cable, tighten the cable clamp and connect the bus connection socket.
7
Clean and dry the surface of the sensor.
8.
Switch on the system and measuring system.
9
Read off the fraction value for the air and carry out an offset. New calibration of the measuring section
is not required (see PC software).
