TX6351 • TX6352 User Manual
50 P5536.1600 rev B
P5536.1600 rev B 51
Gas Inlet Port
• Check the condition and clean with a
small brush to remove dust and debris
IP ratings do not imply that the equipment will detect gas, during and after
exposure to those conditions
If it is suspected that the gas inlet port has been exposed to water in
conditions that exceed IPx4, the sensor should be dried and the response of
the sensor checked.
Annual Safety Check
The main sensor unit will not normally require maintenance or calibration, but it is
advisable to return it to the Trolex Product Support Department for an annual safety
check.
Calibration
The Sentro 1 performs an important safety function and periodic calibration is an
essential part of maintaining safety integrity.
Gas sensors have a known ZERO and SPAN movement related to time, level of exposure
to gas, and the nature of the environment, so Trolex recommend that the sensors should
be bump tested with a suitable test gas at regular intervals. This should be carried out in
accordance with best practice for the industry where the gas sensor is being used.
Periodic calibration of the gas sensor should be carried out whilst it is in service. For
oxygen and carbon monoxide gas sensors Trolex recommends that this is carried out
every 3 weeks. For other gas sensors Trolex recommends that this is carried out in
accordance with best practice for the industry where the gas sensor is being used, and
should take into consideration local operating conditions.
Recommended Test Gas Concentration
Gas Sensor Type
Zero Gas
Calibration Gas/ balance gas
CH
4
(Pellistor) 100% LEL
Zero Air
2.2% v/v CH
4
in air
CH
4
(Infra Red)
Zero Air or Nitrogen 100%
50% to 100% of range CH
4
in N
2
CO
Zero Air
50% to 100% of range CO in air
H
2
S
Zero Air
50% to 100% of range H
2
S in air
NO
Zero Air
50% to 100% of range NO in air
NO
2
Zero Air
50% to 100% of range NO
2
in air
SO
2
Zero Air
50% to 100% of range SO
2
in air
CO
2
Nitrogen 100%
50% to 100% of range CO
2
in air
O
2
Nitrogen 100%
Clean air, or 50% to 100% of range
O
2
in N
2
Standard test gas canisters are available from our Product Support department and can
be supplied in a range of capacities from 34 litres up to 110 litres.
Please call our sales engineers for advice regarding recommended test gas procedures
and product support plans.
Test gas equipment may be ordered from Trolex using the order code: P5393.23. The kit
is comprised of a 0.5 litre/min gas regulator, pipe-work and gassing hoods.
Checkpoint
• CH
4
test gas must be combined with balance air if being used to calibrate pellistor
based devices.
• 25% O2 cannot be supplied. A maximum concentration of 23% can be supplied.
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