Atest Gaz PW-033-A, User Manual

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1.2 Operation principle
The Control Unit Modules Sigma MOD LED and Sigma MOD DO scan statuses of detectors connected to the
gas monitoring system and read their indications. That information is depicted by means of indicating LEDs.
The measured values of gas concentration as well as other special signals (e.g. defects) are used to control
relay outputs of the unit. Specifically, these outputs may activate various sound and visual warning devices.
The Control Unit Module reads statuses of binary inputs (both electric digital inputs (DI) and logic External
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User Manual: POD-002-ENG R03
Figure 2: Example of collaboration between the Sigma MOD LED device and ambient environment
Operator
Gas Detector
SmArtGas 4
Field – deployed
Warning devices
Automation systems, PLCs,
SCADA, fire protection
Field personnel
Sigma MOD LED
Area covered by a system for gas concentration monitoring
RS485
Relay Outputs
Digital Insputs
Digital inputs
Display, keypad
Digital inputs Relay outputs
Field equipment of
the Sigma Gas system
Sigma Bus
data transmission bus
Sigma Bus
data transmission bus
Figure 1: Application of the Control Unit Module Sigma MOD LED
Scanning and control
of gas detectors
Presentation of
the system status
Data sharing with
other systems
Control of
warning devices
Operator
Gas Detector
SmArtGas 4
Field-deployed
warning devices
Automation systems, PLCs,
SCADA, fire protection
Sigma MOD LED
Sigma Gas
system control