Atest Gaz Alpa EcoDet XT, Руководство пользователя

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1.2.2 Warning 1 (1 st threshold) /Warning 2 (2 nd threshold)
It is the mode of operation when a slight concentration of a hazardous gas is detected and a user must be
aware of the situation.
The following measures should be undertaken:
identification of a reason for presence of gas, which include:
• leaks from technological systems of a plant,
• disturbance of the detector operation by gas-emitting substances, e.g. solvents with high
concentration or fuel fumes – such substances must be removed from the monitored areas,
• bias of the detector characteristic curve. As the time goes by the zero point of the detection
curve tends to drift. When scheduled calibration is neglected the warning thresholds may bias
to the area of clean air. Such a reason for the detector misbehaviour is expected when
competent personnel by means of appropriate instrument found no leaks of gas at the facilities
and presence of disturbing substances also was not revealed.
1.2.3 Alarm (3 rd threshold)
It is the detector status that occurs when gas concentration exceeds the alarm threshold (3 rd threshold).
If so, the following measures should be undertaken:
evacuate all third persons from the endangered area,
if possible, enable ventilation of endangered confined areas, open windows and/or doors (when
a control system that automatically activates the ventilation system is not in place).
1.2.4 Failure
In parallel to measurements of gas concentration the detector performs a number of self-tests to make sure
that both the detector itself and the whole system are in sound operating condition.
Internal failures reported by the detector refer to problems with a gas sensor.
The detector can also report failures within the gas detection system, for instance:
break of the communication bus,
incorrect levels of electric current at the detector inputs,
incorrect position of the configuration switch,
breaks of connection with the Alpa EcoWent XT detector.
1.2.5 Warm up
Upon the power voltage for the detector is on, the device needs some time until operation parameters of
a gas sensor are stabilized. It is the time period when no measurements are taken, but after the warm-up
time that usually takes about 1 minute the detectors starts its regular operation.
2 Safety
Do never allow operation of the detector when insulation of interconnecting cables or
conductors of the system is damaged or cut.
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User Manual: POD-043-ENG R03