Atest Gaz ProGas 4, User Manual

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Non-critical
failure
Detector malfunction threatening its accuracy of measurement (e.g. time out for periodic
calibration).
Critical failure Faulty detector.
Table 2: Gas detector status
1.4
Detected gases
Depending on the gas to which the gas detector is intended, the manufacturer configures the device's
measurement parameters – selects the type and range sensor used (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 detectors measurement parameters configuration can be found in document
Measurement parameters configuration document (DOK-6073).
Information about sensors properties can be found in User Manual – Sensors used in gas detectors
produced by Atest Gaz (POD-062-ENG).
1.5 Output signal
RS-485 – this port allows easy integration with data transmission systems, visualization systems in
ACP, industrial controllers – details in section 4.2.
4 – 20 mA output – it allows for easy integration of the gas detectors with other automation
systems, e.g. with industrial controllers – details in section 4.3.
Relays – it allows the direct use of gas detectors to control executive devices – details in section
4.4.
1.6 Gas detector with an FL.C head
Gas detectors designed for installation at poorly accessible or inaccessible locations (e.g. highly, closely
under ceilings) can be equipped with dedicated heads (H=FL.C) that enable supplying a reference gas
directly to the detector.
It is the solution that facilitates calibration of a gas detector, where one end of a flexible hose (with the size
of 6/4 mm) is connected to the detector and the other end is lowered to a location that is accessible for an
operator – see Figure 2.
The FL.C can be used only for some specific gases – see details in DOK-6073-ENG
“Configuration of measurement parameters”.
The calibration procedure is described in Section 5.6.2.2. In addition, the calibration procedure for gas
detectors furnished with the FL.C head must be carried out with consideration of the following constraints:
flow rate of a reference gas must be not less than 0.5 ltr./min,
wind velocity nearby the detector must not exceed 0.5 m/s.
The manufacturer recommends to use a Reference Gas Supply Unit together with a suitable hose – see
details in Section 8.
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User Manual: POD-064-ENG R05