Atest Gaz Alpa EcoDet XT, User Manual

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launch test of the detector operability, i.e. depress and hold the TEST button provided inside the
detector (see Figure 2) and wait until the central unit reports the ALARM status. Depressing of the
TEST button on a specific detector should trigger indication of the ALARM status on the detector
under test and on a control unit,
keep the TEST button depressed (all detectors report the ALARM status) take a measurement of
power voltage across power supply terminals of the most distant detector. The actually measured
voltage must not be lower than the minimum limit for supplying the detectors (see Table 6).
Insufficient level of power voltage across input terminals of detectors indicates that cross-section
of power supplying cables are selected improperly or output voltage of the power supply unit for
the system is too low,
test of detector response to a reference gas is recommended,
operability test must be carried out for each single detector,
should the system fails operate in a proper way, recheck all connections or contact the equipment
manufacturer,
passing result of all foregoing test is the indispensable condition to approve the system for regular
operation.
9.4 Scheduled maintenance
Operators of gasometric systems must be aware of the fact that gas detectors, or more precisely gas
sensors, are vulnerable to ageing processes as the time goes by and to impact of ambient environment. It is
why scheduled maintenance and checks of the system must be carried out on regular basis.
Such inspections and maintenance must be carried out by trained personnel, in line with the applicable
state-of-the-art, general safety rules and special conditions for installation of the equipment.
Schedules maintenance includes the following operations:
verification and calibration of detectors,
replacement of consumables and fast wearing parts,
scheduled inspections.
9.4.1 Verification and calibration of detectors
A gas sensor incorporated into the device is vulnerable to ageing and impact of ambient environment. As
a consequence, its sensitivity naturally decreases in pace with its operation time.
To compensate that deterioration effect all gas detectors must undergo regular verification /calibration,
where the frequency of such measures is specified in the Calibration Certificate (see Table 6) issued for the
Gas Detector Alpa EcoDet XT. These operations must be entrusted to a service company authorized by the
equipment manufacturer. The calibration process can be carried out in several way:
removing of a detector from a gas safety system to send it to the manufacturer for calibration,
disassembling of gas detector to remove sole measuring heads and to send them to the
manufacturer – the MiniPel measuring head can be removed from the Alpa EcoDet XT gas
detector upon opening of the device enclosure (see Figure 2). Keep in mind that power voltage for
the detector must be mandatory switched off beforehand,
execution of calibration on site by an authorized service team against a request sent by the system
operator.
In any case, all expenses related to calibration, p&p and travels shall be borne by the system operator.
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User Manual: POD-043-ENG R03