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If more detailed information on system status is required and/or it is necessary to perform
additional operations or settings, the operator can use the dynamic keyboard available under the
unit display.
5.1
Front panel
Sigma Control L Unit front panel includes:
system status LED field (see section 5.1.2),
visual indicator System field (see section 5.1.1),
LCD display field (see section 5.1.3),
navigation push button field (see section 5.1.3).
Figure 11: Sigma Control L Unit front panel with fields description
5.1.1
System Visual Indicator Field
System Visual Indicator allows the operator, who is normally focused on other activities, to quickly assess
site gas safety status – by taking a quick glance at the indicator and confirming that only the green LED is on.
System Visual Indicator is responsible for displaying four independent information:
LED
Color
Description
MONITORING
Green
Active, if at least one of the detectors connected measures gas concentration.
FAULT
Yellow
Active, if at least one system component is faulty.
SERVICE
White
Active, if at least one system component is in service status (e.g. warming up,
calibration, “inhibit”, test or system configuration).
ALARM
Red
The most important and largest indicator, active if at least one Gas Detector
detects a dangerous concentration.
Table 4: Description of System Visual Indicator LED's
p. 16|38
User's Manual: POD-026-ENG R17
MONITORING
ALARM
FAULT
SERVICE
Sigma
Control L
SYSTEM VISUAL
INDICATOR
DISPLAY
KEYBOARD
STATUS LED'S
