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1
Preliminary information
1.1
Safety
This device may contain voltage dangerous to human health and life. Disconnect the device
from its power supply to carry out any tasks to be done after its cover removal.
1.2
Purpose
Sigma Control L is an advanced Control Unit for use with small size gas detection systems. It controls all the
devices connected and integrates them to create a single Sigma Gas system. Its advantage is to provide two
unique, clear and consistent data presentations:
general view:
Sigma Control L (like other Sigma Gas system Control Units) is provided with a unique Visual
System Indicator allowing users to precisely and immediately assess the whole system “at
a glance”, even remotely.
detailed view:
the user staying in the vicinity of the Control Unit can monitor its indications (e.g. detectors) and
manage them (alarm confirmation, changing parameters, etc.).
The Sigma Control L Unit cooperates with other Sigma type devices and makes an optimum and economical
solution to provide access to all basic Sigma Gas system features.
Sigma Control L Unit reads:
signals from Gas Detectors connected to it (measurement values, diagnostic information, etc.),
digital input (DI),
operator’s inputs (keyboard).
By using this information Sigma Control L:
activates signal connected (both acoustic and visual),
generates visual, acoustic indications for users,
activates system outputs (e.g. to DCS or a ventilation system).
1.3
Device characteristics
Basic functionalists
Supports from 1 to 20 detectors.
Two 24 V DC outputs dedicated to control a visual and acoustic indicator.
Three configurable dual outputs to provide the following functionalists:
• output is triggered if detector warning and alarm thresholds are exceeded (warning 1,
warning 2 and alarm),
• system status indication by using a visual system indicator,
• pulse valve control (see table 3),
p. 6|38
User's Manual: POD-026-ENG R17
