Atest Gaz Alpa EcoWent XT, User Manual

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1 Preliminary information
1.1 Purpose
Alpa EcoWent XT is a 3-threshold gas detector for detecting the presence of hazardous concentrations of
carbon monoxide in the surrounding atmosphere, incl. in such facilities as garages and underground car
parks.
The Alpa EcoWent XT Gas Detector is not intended for use in potentially explosive
atmospheres.
An electrochemical sensor was used as an element detecting the presence of a hazardous gas. This solution
is characterized by a high resistance to the change of environmental conditions, such as temperature,
humidity, pressure. The Alpa EcoWent XT Gas Detector is also characterized by high resistance to the
presence of disturbing factors (e.g. methane, isobutane, carbon dioxide), which eliminates generation of
false alarms.
The CO (carbon monoxide) sensor demonstrates a slight sensitivity to hydrogen and ethanol vapours,
however, in typical applications, these gases occur sporadically and in small quantities. More details on
electrochemical sensors can be found in Appendix [2].
Basic operational features include:
safe, low-voltage installation,
ease of installation,
possibility to connect the components in a "bus system" or a "star system",
possibility to connect the Alpa EcoDet XT detector (we obtain a cooperating pair of CO and LPG
detectors),
possibility to calibrate the detector by replacing the sensor plate (shortening the calibration time),
three alarm threshold,
detector failure and loop breaking indication,
long term, stable operation.
These features, at an extremely attractive price, make Alpa EcoWent XT Gas Detector an ideal solution for
low cost applications, e.g. in public construction.
1.2 Description of operation
The Alpa EcoWent XT Gas Detector is one of the elements of the Gas Safety 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 part of the housing (see Figure 2) and output current
signal. In addition, if it works in an alarm loop system (see Section 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).
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User Manual: POD-042-ENG R04