Atest Gaz ProGas 4, User Manual

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ambient temperature – ambient temperature should be in line with the values declared by the
manufacturer (or see table 10). Especially during the start-up of the technological installation and
in the case of technological failures, attention should be paid to whether there is any temporary
exceeding of the temperature range, and when it occurs – please contact the manufacturer,
if the detector operates at an ambient temperature higher than the maximum permissible
ambient temperature, the effect may be a thermal detector failure can occur,
danger of flooding the detector with water or other substance – it may lead to the inh ibit of the
detector,
possible outdoor mounting – for outdoor mounting the device must protected against
condensation of moisture inside the housing since it may lead to blocking of the inlet sintering
material. Such protection can be achieved e.g. by heating of the detector by several centigrades,
the oxygen content in the environment:
• especially in the case of catalytic detector (pellistor type), oxygen content less than 18%
significantly reduces the sensitivity of the detector,
the presence of other gaseous substances which can cause:
• false alarms – e.g. the presence of aerosols in the case of semiconductor gas detectors – see
User Manual – Sensors used in gas detectors produced by Atest Gaz (POD-062-ENG),
• pollution of the detector – e.g. the presence of silicone can cause damage to catalytic detector
– see User Manual – Sensors used in gas detectors produced by Atest Gaz (POD-062-ENG),
• crossover effect – the sensor also reacts to other gases, e.g. an electrochemical sensor of
carbon monoxide can also react with hydrogen – see User Manual – Sensors used in gas
detectors produced by Atest Gaz (POD-062-ENG),
• masking effect – a reaction of the sensor to the working gas can be reduced in the presence of
other interfering gases (e.g. in the presence of nitrogen dioxide, the sensor of sulphur dioxide
reacts weaker to the working gas).
3 Description of the construction
Figure 3: The construction of the device and its dimensions
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User Manual: POD-064-ENG R05