DALEMANS D-TEX3F+, Instruction Manual

Page: 14 / 18

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14
4. MAINTENANCE
Before performing maintenance operations, please inhibit the safety function of
the detector on the alarm panel and secure the servo controls connected to the
system to prevent any untimely activation or any false alarm.
Never open the detector in the presence of explosive gas.
Regularly clean the dust deposits from the detector using a damp cloth ONLY to
limit the risk of electrostatic discharge.
When the detection head’s filter has been contaminated with solvents, gas or gas
vapours, the detection head must be replaced and the inspection frequency must
be doubled.
The gas detectors must be calibrated at least once a year to compensate for the
loss of sensitivity of the sensors. This calibration must be carried out according
to the procedure given by DALEMANS or by its local representative and, in any
case, by qualified personnel having received appropriate training.
4.1. Replacing the sensor
To facilitate its replacement, the sensor is supplied pre-
mounted on the D•BASE 3F+ card.
▪ Unscrew the four screws from the detector’s cover and remove the cover.
▪ Disconnect the cable from the “
24V GND OUT
” terminal block completely.
▪ Remove the D•BASE 3F+ card from the detector’s box.
▪
Insert the new card into the box and reconnect the cable as indicated in Figure 6.
▪ Reclose the detector box’s cover using its four screws.
▪
Power the detector back up and wait 15 minutes for its signal to stabilise.
▪
Calibrate the detector according to the DALEMANS procedure or the local representative.
▪
Re-estab
lish the detector’s safety function on the alarm panel.