GASSONIC OBSERVER-i
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NOT be passed as a positive by the ANN. When the SPL exceeds 64 dB, the ANN will pass a gas leak
as a positive and trigger an alarm. It is recommended to keep the ANN sensitivity as low as possible to
enhance the detection range and use the full potential of the ANN technology. The ANN sensitivity is
set internally by means of the magnet on the display in 5 dB steps between 44 and 99 dB. The factory
default setting is 54 dB.
Delay Time
An internal alarm delay time is implemented to eliminate spurious alarms due to short background
noise peaks. This delay time can be set internally from 0 to 240 seconds. The factory default setting is
set to 10 seconds for Classic Mode and 2 seconds for Enhanced Mode.
In Classic Mode, the internal alarm delay time is only connected to the alarm relay and not the 4-20 mA
analog output. When using the analog output in Classic Mode, an alarm delay should be programmed
in the fire & gas system.
In Enhanced Mode, the delay time controls the alarm relay as well as the analog output. The delay
time in Enhanced Mode represents the time a gas leak is recognized by the ANN, an alarm is raised on
the analog output and the alarm relay becomes active.
4.3.4. Alarm Relay Energized / De-Energized
The alarm relay can be normally energized or normally de-energized. In either energized state the
single pole double throw allows for the opening or closing of a contact for an alarm. The normally
energized state is a failsafe method. If an alarm or power outage occurs, an alarm condition will be
indicated. The factory default setting is normally de-energized.
4.3.5. Alarm Relay Latch / Non-Latched
The alarm relay can be latched to retain the alarm condition even if the gas leak goes away. This relay
feature can be configured using a magnet on the display as well as via HART or Modbus interfaces.
The factory default setting is non-latched.
4.3.6. Modbus
Modbus is an optional serial communication channel used to obtain control information. The Gassonic
Observer-i has two independent Modbus channels. The second Modbus channel can be configured as
an optional HART interface.
•
Baud rates 2400, 4800, 9600, 19200, 38400, 57600 bps
Factory default is 19200 bps
•
Formats 8-N-1, 8-N-2, 8-O-1,
Factory default is 8-N-1
•
Address
Factory default is Channel 1 Address 1 and Channel 2 Address 1
4.3.7. HART
Enable
•
Selects whether channel 2 is Modbus or HART
Factory default is if HART is installed HART is enabled & current is normal
4.3.8. HazardWatch
HazardWatch is used when the Gassonic Observer-i is part of a General Monitors HazardWatch Fire
and Gas System or a MSA Model 10K system.
The factory default is disabled.
Содержание Observer-i
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