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In the development of gas monotoring plants
the following planning options are recommended:
AP normally deliver 0-10Vdc/4-20mA detectors,
if power supply and signal reception for these can be arranged, or
systems with detectors for central instruments, or completely
independent detectors without instruments that provide a relay
signal in cases of alarm.
Each analog detector is supplied with data to
interpret the analog output signal it produces.
All types of analog sensors, not only for gas
can be used on AP:s entral instruments.
Each detector generates two alarm levels
in the central instrument, one for control purposes (flashlight), the
other for emergency purposes (gas alarm sign).
Each detector is reported separately on the
central´s display.
Each detector's alarm levels, give control
options which to a large extent can be customized.
Normally each sensor provides its own
relay signal at level 1 (flashlight) and level 2 (gas alarm
sign).
Level 2 can also often be designed with a
condition so that a minimum number of detectors´ Level 2 alarms, is
required before the relay is activated.
The relays also have a built-in time delay.
Time delay can also be customized.
Each gas central has at least one measured
data per gas type so that before entering the monitored space, the
staff can see the detector readings.
The gas centrals are equipped with
self-diagnostics that can alert errors in the plant:
Alerts are given even for inadequate AC power
or battery back-ups.
The gas centrals hve the following has the
following system functions
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Easy operation with six menu buttons
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Password protected in two levels
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User Level 1
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Service technicians level2
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Individual identification of each zone /
sensors
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Self Diagnosis
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Sensor error
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Wiring eror
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Instrument error
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Reads both current and average values (10
values measured during the time span) in the display.
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Can supervise 2-64 zones
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Service Function 60 minutes
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External alarm blocked
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Resets automatically
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Display information that service of the
the system is necessary
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The display shows phone number to the
service technician when service date is exceeded
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Choice of different types of gas
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The last 15 erros alarms marked with date
and time
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Log of recent arms
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Current alarm displayed in text
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5 alarm levels per detector
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Output alarm relay can be set with time
delay
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Alarm memory showing the last 5 alarms
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Manual control of output relay functions
possible
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Programming for the flash function for
gas alarm sign
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External relay control
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Operation Mode = Evaluation of alarms
from current are average values
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Time delay at start
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Check and configuration lists
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