Samon DT 300, Инструкция по эксплуатации

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DT 300
(v0.1)
IS DT300 1410 (SE_GB_D_ES).doc 6
GB
Altering of set point, and adjustments shall be carried out
by trained personnel only, who has adequate knowledge of the
products. Incorrect handling may cause that the system
becomes inoperative.
DT300 is an instrument to be used with:
- Detectors type G-series
- Detectors type MP-series in combination with SPU/MPU
- Monitoring units type MPU & SPU
DT300 Instrument can be used as follows:
-Determine the environment of the actual detector.
Units with SC-sensors only.
- Verify offset-value when changing sensor head
Units with SC-sensors only.
- Measure sensor signal during ”bump-test”, or when using
reference gas
- Check of alarm
thresholds
1. Start of DT300
The instrument is switched on via the on/off button on the left
side of the unit. At start up the letter “W” will be flashing on the
left side of “Ref sensor” value. The letter “W” indicates that the
sensor is warming up. Check that this “Ref-value” is stabilized
before to use the instrument. No adjustment is to be carried out
before that the indication has
extinct.
2. Control of the Ref-sensor offset (SM-300).
To control the status of the Ref-sensor, one should start the
instrument in a possible clean environment, e.g. outside.
-
The “zero”-value of the sensor is defined as the signal
(VDC) when in clean air
By that, it is normal that the signal varies in various
environments, and also due to temperature and humidity.
The output is normally higher during summer than winter.
The acceptable variation is given in the data sheet of the
specific sensor. The factory set sensor module, does normally
not require any adjustment. Although, a small “drift” can occur
due to environment and the frequency of use.
- If the value shown in the display is within the green area ,
no adjustments is required
- If the value shown in the display is within the orange area ,
the value should be adjusted
- If the value shown in the display is within the red area, the
sensor has to be replaced
If the value in the display increases when entering a
plant room e.g., this indicates that there are substances
present that effects the sensor. This value is to be the
reference value for the detectors within this perimeter.
Normal variation
Adjustable deviation
Sensor to be replaced
3. Adjustment of the reference sensor offset (SM300)
Always start the procedure by checking the due date of the SM-
module. (See label on the module)
If due date is passed, the SM-module shall be replaced
without delay. Sensors is a perishable item that is effected 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 SM-module there is a potentiometer that is accessible by
the hole in the end of the housing of the instrument.
(See picture below)
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.
4. 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 underneath the test
terminal socket. (See picture, page 2)
- When testing a detector of the MP-series without the six
pin test socket, an adaptor cable is required to enable
connection to the DT300.
5. Check the system voltage of the detector
The system voltage of the detector shall be 5 VDC ± 0,15V
(See picture, page 1)
If the deviation is larger, check the power supply of the detector.
6. Check the detector output
Make sure that the sensor head of the SM-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 visualised 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 picture, page 2) to reach the similar value as of
the ref-sensor. See the instruction of the specific detector.
At large deviations, > +-0,5VDC, the sensor head is
probably damaged/poisoned, and shall be replaced.
Guide
SM-module adjustment