Atest Gaz Alpa EcoDet XT, Руководство пользователя

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1 General information
1.1 Purpose
Alpa EcoDet XT is a 3-threshold gas detector for detecting the presence of hazardous concentrations of LPG
(C
3
H
8
, C
4
H
10
) 1 in the surrounding atmosphere, incl. in such facilities as garages, underground car parks, liquid
gas boiler rooms or halls heated with gas radiators.
The Alpa EcoDet XT Gas Detector is not designed for installation in areas with potentially
explosive atmospheres.
The presence of a hazardous gas is detected by means of a catalytic sensor. Such a solution features with
high insensitivity to variations of ambient conditions, such as temperature, humidity, pressure, etc. In
addition, the Alpa EcoDet XT Gas Detector also demonstrates immunity to disturbing factors, which
prevents from generation of false alarms.
More details about catalytic sensors can be found in Appendix [2].
Key features of the detector:
safe, low voltage electric circuits,
easy installation,
possibility to arrange the components as a ‘bus layout’ or a ‘star layout’,
option to directly connect the detector to the Alpa EcoWent XT detector, which makes up a pair of
collaborating devices for detection of both LPG and CO,
quick calibration of the detector by simple replacement of the MniPel Head (reduction of the
calibration time),
three alarm thresholds,
indication of detector failures or interruption of the monitoring loop,
long term operation with steady parameters.
These features, at an extremely attractive price, make Alpa EcoDet XT Gas Detector an ideal solution for low
cost applications, e.g. in public construction.
1.2 Description of operation
The Alpa EcoDet XT Gas Detector is one of the elements of the gas detection system. It performs cyclical
measurements of gas concentration in the air. Information about exceeding a certain threshold is
transmitted using the controls located on the side of the enclosure (see Figure 2) and output current signal.
In addition, if it works in an alarm loop system (see sections 6.2, 6.3), at its input (via an XT T-connector)
a current signal can be passed from the next detector – Alpa EcoWent XT or Alpa EcoDet XT. This signal is
compared with the local value and a signal corresponding to a status of a higher priority is transmitted to
the output (see Table 1).
The Alpa EcoDet XT Gas Detector may directly collaborate with the Alpa EcoWent XT detector (owing to the
interconnection via X2 terminal of the Alpa EcoWent XT unit). Such a combination makes up a pair of
detectors that enables simultaneous monitoring of LPG emission (C
3
H
8
, C
4
H
10
) and carbon monoxide (CO).
1 Calibration gas – C
3
H
8
.
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User Manual: POD-043-ENG R03