Atest Gaz Sigma SmArt, User Manual

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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 [10]) – 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. In this condition, the detector does not make measurements.
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.
Non-critical
failure Detector malfunction threatening its accuracy of measurement (e.g. time out for periodic
calibration).
Critical failure Faulty detector or no detector.
Table 2: Gas detector status
1.4
Detected gases
Depending on the gas to which the gas detector is intended, the manufacturer selects the type of the
sensor (to avoid confusion, it is assumed that the sensor is an element which converts the gas concentration
into an electronic signal, and the gas detector is the entire unit).
Information about sensors used in gas detectors can be found in the attachments:
semiconductor sensors DET – appendix [4],
catalytic sensors – appendix [5],
electrochemical sensors – appendix [6],
photoionization sensors – appendix [7],
Hot Wire sensors – appendix [8],
IR sensors – appendix [9].
1 The condition is present only for the detectors with a catalytic sensor. Active lock mechanism.
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User's Manual: POD-009-ENG R07