Atest Gaz PW-033-A, User Manual

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1 Preliminary information
1.1 General description
Gas Safety Systems have been used for many years for continuous monitoring of ambient atmospheres and
detection of hazardous gases. The Sigma MOD LED and Sigma MOD DO described in this manual are parts
of the Gas Safety System Sigma Gas, a comprehensive solution for safety of hazardous environments. The
system includes the following components:
gas detectors – to monitor composition of ambient atmospheres in areas to be protected,
control units – to read and collect information from detectors and develop output signals,
necessary, for instance, to control alarm systems,
indication and warning devices (light beacons, stacklights and sound warning sirens) to alert
persons on endangered areas about hazards,
network hardware Sigma BUS to guarantee safe exchange of information within the system,
auxiliary equipment, such as control HMI panels, data gateways, mimic boards to enhance
performance of the system with additional functionalities, such as tuning of system parameters,
advanced techniques for visual presentation of information, integration with external systems, etc.
The scope of functionalities implemented into the Sigma MOD LED and Sigma MOD DO control unit's cover
a great portion of aforementioned features. These include (see also Figure 1 and 2):
communication with gas detectors,
control of light and sound warning devices (by means of relay outputs),
transmission of information about the system status to other external systems (via the RS-485
digital link or by means of relay outputs),
presentation of the system details for operators (by means of light indicators or an embedded
buzzer),
control of the entire system operation (by means of user interface pushbuttons, binary inputs and
the RS-485 digital link).
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User Manual: POD-002-ENG R03