It is good safety practice to carry out regular preventative maintenance to
confirm correct operation. The periodicity for preventative maintenance should
be in line with best practice for the industry where the gas sensor is being used
and take into consideration local operating conditions.
9.1
Output Signal
Check the response of the sensor at pre-determined intervals
by injecting a test gas using a Trolex TX6520.32 Gas Test Kit.
Compare the value of the display with the value marked on the
test gas canister.
Calibrate the TX6383 using the instructions in Section 8.
Insert an approved test meter into the signal line.
Inject a test gas using a Trolex TX6520.32 Gas Test Kit.
Compare the value on the test meter display with the measured
line value.
If the value on the test meter does not match the value on the
display:
Recalibrate and then carry out the proof test again
OR
change the gas sensing module, calibrate and then carry out the
proof test.
9.3
Gas Sensing Modules
The gas sensing modules should be changed at regular intervals to
ensure accuracy of response.
The response of the Pellistor sensor will gradually shift due to normal
device decay. The average life is about 5 years, influenced mostly by
the operating environment and the mean level of
exposure to flammable gas during its lifetime.
The shifting response of the cell should be checked at regular intervals
particularly on new installations.
The modules are conveniently replaceable giving a pre-calibrated
standardised output signal. They can be changed in seconds.
Service replacement modules can be supplied by our Product
Support Department on a regular basis.
Simply insert the new module into the instrument and return the
original for checking and calibration.
FLAMMABLE GAS SENSOR/TRANSMITTER
A T E X
M1
GROUP I & II
INTRINSICALLY
SAFE
9 MAINTENANCE
LOCK
Refer to Section
8
Refer to Section
9.2
AIR
CH
4
AIR
CH
4
RELEASE
The sensor will transmit an alarm signal if
a replacement gas sensing module is
not fitted within 15 seconds.
CURRENT
OUTPUT
SHOWN
Refer to Section
5 .14
20/28
INSTALLATION & OPERATING DATA
9.2
Proof Test
.
TT X
X 66 33 88 33
ISSUE S 01/15
