Samon DT 300, Руководство пользователя

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IS DT300 200928 7 / 32
Eng
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DT300
6. Adjustment of the reference sensor offset (Sensor module)
Always start the procedure by checking the due date of the sensor module. (See label on the module).
If due date is passed, the sensor module shall be replaced without delay. Sensors is a
perishable item that is affected by dust, dirt and can be “poisoned” by various substances such
as, aerosols, paint, solvent fumes, glue and similar.
- Before adjustment, the unit should be active in a stable environment for at least one hour.
At the sensor module there is a potentiometer that is accessible by the hole in the end of the housing of the
instrument. See Fig. 3. Carefully adjust by using a small screwdriver. When the offset value passes from the
orange area to the green area, called (normal variation) of the sensor, the task is completed.
The instrument is now ready for use.
7. Connect the instrument to the test-socket of the detector
The small guide at the cable-socket should be pointing to the right, when the three potentiometers for alarm
threshold adjustment of the actual unit, are located under the test terminal socket. See Fig. 2.
8. Check the system voltage of the detector
The system voltage of the detector shall be 5 VDC ± 0,15V
If the deviation is larger, check the power supply of the detector.
9. Check the detector output
Make sure that the sensor head of the sensor module and the detector are identical.
- The detector has to be powered for at least one hour before control is carried out, and it
should not be exposed to draft.
The sensor output of the connected detector is visualized at the very left of the upper row of digits. This value is
to be compared with the value of the reference sensor within the DT300. Adjust the value of the detector via the
potentiometer, marked “GV-offset pot”
(see Fig. 9) to reach the similar value as of the ref-sensor. See the
instruction of the specific detector ( Fig. 6).
At large deviations, > +-0,5VDC, the sensor head is probably damaged/poisoned, and shall be
replaced.
Monitoring unit
s and detectors has built in “fail safe“ circuit that enables un failure indication in
case of sensor error. The same alarm occurs in case of the sensor signal reaches below
0,1 VDC due to an incorrect adjusted GV-offset e.g.
10. Control and altering of alarm thresholds
On the vertical PC-board of the i GD/GS/GSR/GR/GK/GSH-24/230, GXR-24/230, GEX, MP / SPU/SPLS-
24/230, MPU2/4/6 units, there are three potentiometers (See Fig. 1b) for adjustment of alarm thresholds for C,
B and A alarm