GASSONIC Observer-i, Инструкция по эксплуатации

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GASSONIC OBSERVER-i
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4.0 Operation and Setup
4.1. Receipt of Equipment
All equipment shipped is packaged in shock absorbing containers, which provide considerable
protection against physical damage. The contents should be carefully removed and checked against
the packing list. If any damage has occurred or there is any discrepancy in the order, please notify the
manufacturer as soon as possible. All subsequent correspondence with the manufacturer must specify
the equipment part number and the serial number.
4.2. Normal Operation
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Power up:
The Gassonic Observer-i unit initializes its microprocessor, conducts internal tests and
goes into the normal operation mode within a few seconds. During the power up, the analog output
current is set at 0.0 mA; the software revision and ”TEST” are displayed in sequence.
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Normal: The real-time SPL is shown on the display. The corresponding 4-20 mA analog output
value is set depending on the detection mode, Classic or Enhanced.
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Alarm: Depending on the detection mode (Classic Mode or Enhanced Mode), display shows “A” or
“C” in front of the SPL reading. The alarm relay* is turned on.
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Error: Display shows the type of error, and the error relay is turned on. By default, the error relay is
energized.
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Self-Test: The acoustic self-test is done at regular intervals, and during the test, the display shows
a fixed SPL reading recorded immediately prior to its start.
* Both alarm and error relays are configured as single pole, double throw.
4.3. Setup
The setup can be done in three different ways. The display/magnet is a user input that only requires a
magnet as an external tool. It is best used in simple systems. HART is a method that requires a
HART modem and supporting software. It is best used where there is existing wiring and control
information is desired. Modbus requires a separate pair of wires and an RS-485 to PLC converter. It
is best used for large systems.
4.3.1. Detection Modes
The Gassonic Observer-i supports two detection modes:
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Classic Mode
: Gas leak detection is based only on the SPL Alarm trigger
•
Enhanced Mode : Gas leak detection is based on ANN algorithm and ANN Sensitivity Level
See Section 4.4. for selecting detection modes.
4.3.2. SPL Alarm Trigger
In Classic Mode, the SPL alarm trigger shall be set at least 6 dB higher than the background noise.
When using the Alarm Relay, the trigger level setting should be set internally by means of an
adjustable trigger level in 5 dB steps between 44 and 99 dB. When using the Analog Output, the trigger
level should be set in the fire & gas system. The factory default setting is 79 dB.
4.3.3. ANN Sensitivity Level
In Enhanced Mode, the internal dB setting is referred to as the ANN Sensitivity Level. The ANN
sensitivity level is the SPL level (dB) at which the ANN starts to operate. For example, if the ANN is set
to 64 dB, all acoustic noise received by the Gassonic Observer-i with a sound level below 64 dB will