Atest Gaz Alpa EcoTerm XT, Руководство пользователя

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Priorities State of operation
1 (highest) Exceeded alarm threshold
2 Exceeded warning threshold 2
3 Exceeded warning threshold 1
4 Damage to the detector, bus or information on an incorrect setting of the configuration switch
5 (lowest) Correct operation of the detector
Warm-up
Table 1: Priorities of the Alpa EcoTerm XT Gas Detector
The type of gas, the thresholds and the corresponding current value for a specific detector
should be checked in the calibration certificate.
In the course of its work, the detector makes continuous measurements of gas concentrations in the
environment, and carries out regular tests of the sensor. Depending on the outcome of these actions, it
distinguishes between the states described in the following sections.
1.2.1 Operation
It is a condition in which the detector works properly and conducts measurements. The value of the
measured concentration of gas is below the thresholds and no irregularities were detected in the operation.
The detector does not require special attention of the user, except for:
possibly frequent readout, preferably daily,
systematic ordering of inspections (see subsection 9.4.3).
In that mode the detector can present history of its operation, i.e. exceeding of warning and/or alarm
thresholds as well as failures (if such events took place during the most recent 72 hours).
1.2.2 Warning 1 (threshold 1) / Warning 2 (threshold 2)
It is a condition that occurs when a low gas concentration is detected that requires informing the user.
Actions to be taken:
check the cause, which can be e.g.
• a leak at the facility,
• interruption of the detector operation by other substances (e.g. a high-concentration solvent
or fuel vapours) – the substances should be removed from the supervised premises,
• shift of the detector characteristics. Over time, the detectors tend to zero drift. Therefore, it
they are not calibrated periodically, it may happen that the warning threshold will move to the
level of clean air. The cause of this should be suspected in a situation when competent services
checked the lack of gas leakage in the facility with a special device, and no presence of
interfering substances was found.
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User Manual: POD-044-ENG R01