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7.7
Maintenance schedule
Each user must be aware of the fact that operation of any gas monitoring system leads to inevitable ageing
of equipment, in particular gas sensors, due to detrimental impact of environmental factors. Therefore the
systems must undergo regular and scheduled maintenance.
Maintenance operations shall include:
calibration of gas detectors,
replacements of fast-wearing parts,
scheduled inspections.
7.7.1
Calibration
Gas sensor incorporated into the device is a component that subject to ageing due to environmental
factors, which inevitably leads to deterioration of its sensitivity.
To compensate the deterioration effect the gas detectors must be calibrated on the regular basis (calibration
frequency is specified in the Calibration Certificate – see Table 5) by authorized personnel of the equipment
manufacturer. The calibration procedure can be carried out in several manners:
dismounting of the gas detector to send it to the manufacturer for calibration,
removing only sensor plates to send them to the manufacturer for calibration (see Section
7.7.2.1),
sending a request to authorized service team of the manufacturer to come and calibrate the
detectors on site.
7.7.2
Replacement of fast wearing parts
Please refer to Table 6 for the recommended lifetime and replacement schedule of fast wearing parts.
7.7.2.1 Replacement of a sensor plate
Operation of gas detector leads to natural deterioration of metrological parameters of gas sensors. That
effect can be compensated by regular and scheduled adjustment of the detector indication up to the
moment when the sensor is completely exhausted and must be replaced. It is assumed that replacement of
a gas sensor should take place when its sensitivity drops below 50% of the initial one.
Replacement of a sole sensor is infeasible since it sits on a base plate (sensor plate) and must be replaced
together with its plate – see Table 6.
To replace the sensor plate proceed in the following way:
switch off the power voltage for the gas detector,
open the device housing,
replace the sensor plate (see Figure 1),
close the housing,
switch on the power voltage for the gas detector.
7.7.3
Test / simulation
Tests of the gas monitoring systems are necessary to make sure that the gas monitoring system is in sound
operating condition. Please contact the equipment manufacturer in case of any irregular response of gas
detectors.
The following tests can be distinguished:
s. 16|20
User Manual: POD-046-ENG R01