Atest Gaz ProGas 4, User Manual

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1.2 The principle of operation
The gas detectors measures the concentration of a given component, and then turns it – depending on the
variety (described below) – to understandable signal for other devices of the gas safety system. In addition
to the implementation of the measurement, the detector analyses the value of the measured concentration
and may provide information about exceeding the following threshold values:
warning 1,
warning 2,
alarm,
gas overload (threatening with the sensor damage).
In addition to the above, the gas detector is a self-diagnostic device – in the case of detection of
malfunctions, it informs the user about it.
1.3 Gas detector status
Mode Description
Correct
operation The detector operates properly and makes measurements. The concentration value of the gas
being measured does not exceed threshold values and no irregularities in the device operation
were detected.
Warning 1 Signalled after exceeding the gas concentration above the specific value.
Warning 2 Signalled after exceeding the gas concentration above the specific value.
Alarm Signalled after exceeding the gas concentration above the alarm threshold.
Gas overload Gas concentration has exceeded the overload threshold value. If such is the case, the sensor may
be damaged or its sensitivity and shelf-life may be reduced.
Lock 1 Gas concentration is above the overload value (the default value is 100% LEL). The detector is
locked (see appendix [3]) – the last value of the concentration is shut. The detector does not make
measurements. It is possible to unlock the condition by means of sending the applicable command
from the control unit or from the superior system.
Removing the lock on a detector which is in the conditions of concentration
above the measuring range can damage the sensor.
Warm up After turning on the detector's power supply, the sensors's working parameters stabilize for some
time.
Measurements are also taken during preheating of the detector but no
information about gas hazards is provided. Be aware that exceeding of gas
concentration above its maximum measurable range may led to damage of the
gas sensor.
Calibration In this state the detector allows to change your settings. In the calibration mode it is also possible
to examine the detector without raising an alarm (in fact, the behaviour of the system will be
determined by the interpretation of the data by the central system). The detector can be switched
to this state using the appropriate software tools.
1 The condition is present only for the detectors with a catalytic sensor. Active lock mechanism.
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User Manual: POD-064-ENG R05