Gas Sense Detectors
The
Zeta Gas Sense
detector is a 24V gas
detector that can run either in stand alone
mode, or can be connected to a control panel
for the centralized monitoring of several
detectors.
Stand Alone Mode
In stand alone mode, the detector has 3 relay outputs,
and a monitored 24V output (Intended for alarm sirens).
The 3 relay outputs correspond to the 3 alarm levels
of
PREALARM
,
ALARM 1
and
ALARM 2
. Each of these
threshold levels has a default setting, and can be
altered by +/- 5% or +/- 10%.
The detector will display the gas type, the current
status (normal, fault or alarm), along with the current
sensor reading on its 2 x 16 character LCD display. As
the gas concentration level rises, the detector will light
its relevant alarm LEDs and operate its relays. They
operate concurrently, so that in the highest alarm level,
all lower alarm LEDs & relays will remain ON.
System Mode
In System mode, the detector will display
SYS
to
indicate that it is now part of a system. It will function
similar to when it is in Stand alone mode,
except
the
alarm relays will be under the control of the fire panel.
This feature allows the control panel to monitor the
system as a whole before deciding whether or not to
operate an output.
The detectors can also be locally recalibrated, with
menu options to set the zero level, and options to set
the calibration span, with the use of a calibration gas
cylinder filled with the full scale gas concentration
level.
At the end of the recommended working life of the
sensor, a replacement sensor should be fitted. The part
numbers for each sensor are shown on the specification
table.
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