www.atestgaz.pl
• makes it possible to deny or delay output execution,
• binary input capable of operating in two different modes: as an external alarm or external fault
(it allows for easy integration with other systems, e.g. a fire protection system).
Modern, easy-to-use, intuitive and legible user’s interface.
Gas detection system control by the following commands:
• unlocking detectors (functionality available e.g. for catalytic sensor detectors – disables the
lock protecting catalytic sensor against overload),
• switching detectors into “inhibit" mode (it allows for a temporary deactivation of selected Gas
Detectors); the detector in “inhibit” mode will be ignored by the System (see NOTES in table
12),
• detector parameter changes, e.g. alarm thresholds, noise gateway level, zeroing the detector,
• testing device outputs, user’s interface.
Events history – logging of events related to the system operation.
Safety – two access levels for persons who change parameters, password-protected.
It has an extension slot for adding modules to extend existing functionalists, e.g.:
• RS-485 output module for communication with DCS or SCADA,
• system operation visualization module based on a website – Ethernet accessible.
Sigma Control L Unit is designed for indoor use. It cannot be installed in explosion (Ex) zones.
2
Operation description
Sigma Control L Unit reads the status of detectors connected to the system. This information is presented
on the display and the built-in Visual System Indicator. Based on gas concentration measured and other
special statuses (e.g. failures), it controls outputs for visual and acoustic indicators as well as for dual
outputs. Control Unit reads the status of dual input and depending on its status, controls system operation
(enables or disables outputs). During operation, the unit runs cyclic self-diagnostic procedures used to
detect any damage to Sigma Control L Unit and detectors.
Optionally, the system status image can be accessed externally via a digital connection (by using optional
Extension Module). It makes it possible to connect external systems, or visualization panels. In addition, the
user’s interface allows the operator to give system commands and change its operation parameters.
The whole system uses modern electronic solutions, while the manufacturer has made every effort to
provide a high quality and reliable product.
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User's Manual: POD-026-ENG R17
