Atest Gaz PW-033-B, 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 LCD described in this manual is part 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 LCD control unit 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 (via contact 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),
adjustment of parameters and execution of commands issued by a system operator.
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User Manual: POD-003-ENG R04