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• by a whichever combination of alarm thresholds signals received from whichever detectors
(alarm zones can be customized as desired),
• by a failure signal received from a whichever detector,
• by a collective failure signal (including a defect of the control unit itself),
• by signals assigned to special statuses, e.g. maintenance, measurements (a common user
interface device can be used to indicate status of the system)
• from Digital Inputs (DI) and/or External Digital Inputs (ExDI),
MooN voting (M out of N means that M channels from the group of all N available ones are active
and the output relay is triggered after at least M channels are activated, M and N may range from
1 to 32
operation with a hysteresis according to tripping /reset thresholds of detectors,
tripping delay adjustment within the range from 1 s to 100 min,
reset delay adjustment within the range from 1 s to 100 min,
operation with a tripping status locked after disappearing of a tripping signal (tripped status can
be reset by means of a pushbutton on the front panel, a DI or External DI signal),
temporary deactivation of an output signal whilst the tripping signal keeps remaining active (by
means of the same methods as above),
inverted outputs,
control of a solenoid valve with power voltage of 230V for the valve – without a tests of the valve
control line (3 impulses 1 second long with 1 second of interruption).
Below describe default setting for Sigma MOD LCD:
Output No.
Functionalities
Conditions for the output activation
Conditions for the output deactivation
R1
WARNING 1
Warning 1 – the first threshold is
exceeded.
The monitored concentration of gas drops below the
first threshold.
R2
WARNING 2
Warning 2 – the second threshold is
exceeded.
The monitored concentration of gas drops below the
second threshold.
R3
ALARM
ALARM – the alarm threshold is
exceeded.
The monitored concentration of gas drops below the
alarm threshold.
R4
OPTICAL ALARM
(sustained)
Warning 1 – the first threshold is
exceeded. See figure 6.
The signal to reset a locked alarm (button
)can be
issued only after the gas concentration drops below
the first warning threshold. See Figure 6.
R5
ACOUSTIC
ALARM
ALARM – the third threshold is
exceeded. See figure 7.
The monitored gas concentration drops below the
third threshold. The sound alarm can be temporary
muted (button
). See Figure 7.
R6
MEASUREMENT
At least one detector is operating in the
measurement mode.
None of the gas detectors is in MEASUREMENT mode.
R7
SERVICE
At least one detector is operating in the
service mode.
None of the gas detectors is in SERVICE mode.
R8
FAILURE
No defects
At least one of the devices within the controlled
system reports a defect or no power voltage supplied
to the control module.
1
See figure 5.
s. 11|40
User Manual: POD-003-ENG R04
Summary of Contents for PW-033-B
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