gazex DEX/P Series User Manual page 21

6.2.2. SENSOR MODULE REPLACEMENT
The procedure for removal of the sensor's cylindrical cover must be carried out with the utmost care to
avoid damaging the gas sensor or the threads on the body or cover.
DO NOT power up the system in the absence of this cover!
6.2.3. Procedure for removing the sensor module for calibration:
a) Remove the sensor cover as described in 6.2.1;
b) Unscrew the screw securing the sensor module to the spacer sleeve (if the screw is stuck, hold the
sleeve with pliers).
c) Grasp the edges of the insulating board and disconnect the sensor module (along with the white filler
cap, for DEX-PnK/N or DEX-PnR/N models) from the connection socket (DO NOT pull or touch the gas
sensor!!!).
d) Place the sensor board and the filler cap in a sealed polyethylene bag or container and seal it tightly.
e) A sudden mechanical shock (e.g., dropping onto a hard surface) can permanently damage the gas
sensor!
f) Place in a box padded with soft foam for shock protection (secure the mounting screw separately to
avoid damage to the sensor).
g) Reinstall the sensor cover, lightly tightening it by hand until resistance is felt (excessive force
may damage the anti-corrosion layer on the threaded surfaces!).
h) Tighten the SHIELD LOCKING screw in the detector's body.
i) Do NOT power on the detector until the sensor module is installed.
6.2.4. Procedure for installing the sensor module (with the power off!)
j) Remove the cylindrical sensor cover;
k) WARNING! For MS-PnK/N models, a sudden mechanical shock (e.g., dropping onto a hard surface)
can permanently damage the gas sensor or, as often happens, alter the sensor's calibration settings,
necessitating recalibration! For MS-PnR/N models, a shock risks permanent damage to the sensor!!!
l) Grasp the edges of the sensor module board and gently connect the module to the black connection
socket (DO NOT touch the gas sensor!!!), ensuring all connections enter the socket.
m) Cover the sensor with the while filler cap (if supplied with the new module)
board into the spacer sleeve (do not apply excessive force!).
n) Reinstall the sensor cover to the detector body, lightly tightening it by hand until resistance is felt.
o) Tighten the SHIELD LOCKING screw in the body with a hex key.
After installing the cylindrical sensor cover, replace the grey (or yellow) calibration label with a new one
(provided with the new sensor module or the recalibrated sensor module).
NOTE: for periodic calibration, check or complaint regarding the
sensor – DO NOT remove and return the entire detector to the
Manufacturer and ONLY THE SENSOR MODULE !!!
6.3. Spare parts available for the DEX detector:
a) sensor module (with calibration for a specific medium);
b) sensor shield with porous sinter made of bronze or stainless steel;
c) a set of service keys and locks (hex key, cover 'U' key/handle for the cover, cover locking screw,
sensor shield locking screw);
d) simple mounting bracket made of stainless steel + 2 screws for securing to the detector body;
e) 5 mm copper ring terminal for crimping the wire connected to the equipotential bonding point in the
explosion hazard zone.
6.4. STORAGE OF DEX
DEX-PnK/N and DEX-PnR/N detectors should be stored powered off in a place free from vibrations,
moisture, dust, exhaust fumes, free of any chemically active substances (especially those containing
silicones and derivatives), in a tightly sealed polythene bag. Storage temperature: -20°C to +50°C.
Always store the DEX with the short calibration certificate attached. Calibration is required after a
period of 36 months from the production date.
DEX-PnE/N detectors should be stored in a place free from vibration, moisture, dust, fumes, chemically
active substances, gases with concentrations exceeding the upper measurement range values from Table
1.1.B. column 6, in a gas-tight polyethylene bag. Storage temperature: -20°C to +30°C.
The sensor module should be calibrated every 6 months calculated from the date of manufacture.
User Manual: DEX/P detector, version 9PU2
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WARNING!
©gazex ' 2024 v2406
and screw the sensor
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