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Table of Contents
GASSONIC OBSERVER-I............................................................................................................I
ULTRASONIC GAS LEAK DETECTOR.......................................................................................I
1.0.INTRODUCTION.........................................................................................................7
2.0GENERAL DESCRIPTION AND FEATURES........................................................................8
2.1.Artificial Neural Network (ANN)..................................................................................................8
2.2.Area Monitored by Gassonic Observer-i..................................................................................10
2.3.Detector Outputs ......................................................................................................................11
3.0INSTALLATION....................................................................................................................12
3.1.Mechanical Construction..........................................................................................................12
3.2.Mechanical Operation and Safety............................................................................................13
3.2.1.Specific conditions of use.........................................................................................................13
3.3.Mounting ..................................................................................................................................14
3.4.Wiring Diagram ........................................................................................................................15
3.5.Protective Earth Grounding......................................................................................................15
4.0OPERATION AND SETUP...................................................................................................17
4.1.Receipt of Equipment...............................................................................................................17
4.2.Normal Operation.....................................................................................................................17
4.3.Setup........................................................................................................................................17
4.3.1.Detection Modes ......................................................................................................................17
4.3.2.SPL Alarm Trigger....................................................................................................................17
4.3.3.ANN Sensitivity Level...............................................................................................................17
4.3.4.Alarm Relay Energized / De-Energized ...................................................................................18
4.3.5.Alarm Relay Latch / Non-Latched ............................................................................................18
4.3.6.Modbus ....................................................................................................................................18
4.3.7.HART Enable ...........................................................................................................................18
4.3.8.HazardWatch ...........................................................................................................................18
4.3.9.Acoustic Self-Test ....................................................................................................................19
4.3.10.Inputs........................................................................................................................................19
4.3.11.Output Methods........................................................................................................................19
4.3.12.Relay Ratings...........................................................................................................................20
4.3.13.Alarm Relay Output..................................................................................................................20
4.3.14.4-20 mA Output........................................................................................................................20
4.4.Switching Modes ......................................................................................................................22
4.4.1.Error / Fault Output ..................................................................................................................25
4.5.User Display & Magnet Interface .............................................................................................27
4.5.1.Setting / Checking Detection Mode and Analog Output Mode ................................................29
4.5.2.Forced Acoustic Test ...............................................................................................................30
4.5.3.Setting / Checking Trigger Level (ANN Sensitivity Level)........................................................31
4.5.4.Setting / Checking Cut-Off Frequency (Enhanced Mode only)................................................32
4.5.5.Setting / Checking Delay Time.................................................................................................33
4.5.6.Setting / Checking Alarm Relay Energized / De-Energized.....................................................34
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4.5.7.Setting / Checking Alarm Latching ON / OFF ..........................................................................35
4.5.8.Setting / Checking Factory Default ON / OFF..........................................................................36
4.5.9.Switching HazardWatch Mode ON/OFF ..................................................................................38
4.5.10.HART ON/OFF.........................................................................................................................39
4.5.11.Setting HART Analog Output Range (only if HART is on) .......................................................40
4.5.12.Modbus Setting: Baud (Channel One) .....................................................................................41
4.5.13.Modbus Setting: Format (Channel One):.................................................................................42
4.5.14.Modbus Setting: Address (Channel One) ................................................................................43
4.5.15.Baud (Channel Two) ................................................................................................................45
4.5.16.Format (Channel Two) .............................................................................................................46
4.5.17.Address (Channel Two) ...........................................................................................................47
4.5.18.Loop Test ON/OFF (LTON/LTOF) ...........................................................................................47
5.0FUNCTION TEST, GAIN TEST AND CALIBRATION..........................................................48
5.1.Gassonic SB100 Ultrasonic Bump Tester................................................................................48
5.2.Gassonic 1701 Portable Test and Calibration Unit..................................................................49
5.3.Gain Test..................................................................................................................................49
5.4.Calibration ................................................................................................................................49
6.0MODBUS DIGITAL INTERFACE.........................................................................................52
6.1.Baud Rate ................................................................................................................................52
6.2.Data Format .............................................................................................................................52
6.3.Modbus Read Status Protocol (Query/Response)...................................................................52
6.3.1.Modbus Read Query Message ................................................................................................52
6.3.2.Modbus Read Response Message..........................................................................................53
6.4.Modbus Write Command Protocol (Query/Response) ............................................................53
6.4.1.Modbus Write Query Message ................................................................................................53
6.4.2.Modbus Write Response Message ..........................................................................................54
6.4.3.Function Codes Supported ......................................................................................................54
6.5.Exception Responses and Exception Codes ...........................................................................54
6.5.1.Exception Responses ..............................................................................................................55
6.5.2.Exception Code Field ...............................................................................................................55
6.6.Command Register Locations..................................................................................................56
6.6.1.Operational Mode Commands .................................................................................................56
6.7.Gassonic Observer-i Command Register Details ....................................................................61
6.7.1.Analog (00H) ............................................................................................................................61
6.7.2.Mode (01H) ..............................................................................................................................61
6.7.3.Primary Fault Status/Error 1 (02H) ..........................................................................................62
6.7.4.Fault Status/Error 2 (03H)........................................................................................................63
6.7.5.Model Type (04H) ....................................................................................................................63
6.7.6.Software Revision Major (05H) ................................................................................................63
6.7.7.dB Level (06H) .........................................................................................................................63
6.7.8.Peak Sound (07H)....................................................................................................................63
6.7.9.Unit Temperature (08H) ...........................................................................................................64
6.7.10.Modbus Display (09H, 0AH) ....................................................................................................64
6.7.11.Serial Number (0BH, 0CH) ......................................................................................................64
6.7.12.Trigger Level (0DH)..................................................................................................................64
6.7.13.Trigger Delay (0EH) .................................................................................................................64
6.7.14.Comm 1 Address (0FH) ...........................................................................................................64
6.7.15.Comm 1 Baud Rate (10H) .......................................................................................................64
6.7.16.Comm 1 Data Format (11H) ....................................................................................................65
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6.7.17.Comm 2 Address (12H) ...........................................................................................................66
6.7.18.Comm 2 Baud Rate (13H) .......................................................................................................66
6.7.19.Comm 2 Data Format (14H) ....................................................................................................66
6.7.20.Software Rev Minor (15H)........................................................................................................67
6.7.21.Reset Alarm (16H) ...................................................................................................................67
6.7.22.Sub Mode (17H).......................................................................................................................67
6.7.23.Acoustic Test (18H)..................................................................................................................67
6.7.24.HazardWatch (19H) .................................................................................................................67
6.7.25.Relay State (1AH) ....................................................................................................................68
6.7.26.Alarm Latch (1BH)....................................................................................................................68
6.7.27.Relay Energize (1CH) ..............................................................................................................68
6.7.28.HART Enable (1DH).................................................................................................................68
6.7.29.HART Test (1EH) .....................................................................................................................68
6.7.30.Cal Abort (1FH) ........................................................................................................................69
6.7.31.Comm 1 Total Illegal number of registers Errors (20H) ...........................................................69
6.7.32.Comm 1 Bus Activity Rate % (21H) .........................................................................................69
6.7.33.Comm 1 Function Code Errors (22H) ......................................................................................69
6.7.34.Comm 1 Starting Address Errors (23H) ...................................................................................69
6.7.35.Comm 1 Total Receive Errors (24H)........................................................................................69
6.7.36.RXD CRC Errors (25h).............................................................................................................69
6.7.37.RXD CRC Errors (26h).............................................................................................................69
6.7.38.Comm 1 Parity Errors (27H) ....................................................................................................69
6.7.39.Comm 1 Overrun Errors (28H).................................................................................................69
6.7.40.Comm 1 Framing Errors (29H) ................................................................................................70
6.7.41.Comm 1 Total UART Receive Errors (2AH) ............................................................................70
6.7.42.Factory Default (2BH) ..............................................................................................................70
6.7.43.Comm 1 Clear error (2CH).......................................................................................................70
6.7.44.Clear Stats 1(2D) .....................................................................................................................70
6.7.45.HART Current (2E)...................................................................................................................70
6.7.46.HART Present (2F) ..................................................................................................................70
6.8.Event Logging (30H – 5FH) .....................................................................................................71
6.8.1.Faults........................................................................................................................................71
6.8.2.Alarm........................................................................................................................................71
6.8.3.Calibration ................................................................................................................................71
6.8.4.Maintenance.............................................................................................................................71
6.8.5.User Data (60H – 6F)...............................................................................................................78
6.8.6.Comm 2 Bus Activity Rate % (71H) .........................................................................................78
6.8.7.Comm 2 Function Code Errors (72H) ......................................................................................78
6.8.8.Comm 2 Starting Address Errors (73H) ...................................................................................78
6.8.9.Comm 2 Total Receive Errors (74H)........................................................................................78
6.8.10.RXD CRC Errors Hi (75H)........................................................................................................78
6.8.11.RXD CRC Errors Lo (Same as Hi) (76EH) ..............................................................................78
6.8.12.Comm 2 Parity Errors (77H) ....................................................................................................78
6.8.13.Comm 2 Overrun Errors (78H).................................................................................................79
6.8.14.Comm 2 Framing Errors (79H) ................................................................................................79
6.8.15.Comm 2 Total Receive Errors (7AH) .......................................................................................79
6.8.16.Modbus Cal Error (7BH)...........................................................................................................79
6.8.17.Clear Comm 2 UART Errors (7CH)..........................................................................................79
6.8.18.Clear Comm 2 Modbus Errors (7DH).......................................................................................79
6.8.19.Input Voltage (8DH) .................................................................................................................79
6.8.20.Detection Mode (D9H) .............................................................................................................79
6.8.21.Enhanced Analog Output Mode (DAH)....................................................................................79
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6.8.22Set Cut-off Frequency (E2H) ...................................................................................................79
7.0CUSTOMER SUPPORT.......................................................................................................80
8.0APPENDIX............................................................................................................................81
8.1.Warranty...................................................................................................................................81
8.2.Specifications ...........................................................................................................................82
8.2.1.Electrical Specifications ...........................................................................................................83
8.2.2.Approvals .................................................................................................................................84
8.3.Spare Parts and Accessories...................................................................................................85
8.3.1.Installation Drawings ................................................................................................................85
8.3.2.Calibration Equipment..............................................................................................................85
8.3.3.Test Equipment ........................................................................................................................85
8.3.4.Spare Parts ..............................................................................................................................85
8.3.5.Microphone Replacement ........................................................................................................86
8.3.6.Sound Source Assembly Replacement ...................................................................................87
8.4.Sound Source Calibration ........................................................................................................87
8.4.1.Considerations and Preparations.............................................................................................87
8.4.2.Sound-source Calibration ........................................................................................................87
Abbreviations
•ANN – Artificial Neural Network
•Bps – bits per second
•HART – Highway Addressable Remote Transducer (communication protocol)
•SPL – Sound Pressure Level (measured in decibels)
•UART – Universal Asynchronous Receiver/Transmitter (serial communication port)
•UGLD – Ultrasonic Gas Leak Detector
1
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GASSONIC OBSERVER-i
8
2.0 General Description and Features
The Gassonic Observer-i detects leaks from pressurized gas systems by sensing the airborne
ultrasound produced by gas escaping from the leak. This detection method is omni-directional,
functional in extreme weather conditions, and ideal for fast monitoring leaks from valves and flanges in
complex pipeline systems, both onshore and offshore.
The main advantage using ultrasonic gas leak detectors is that the detector does not need to wait for
gas accumulation, instead it responds instantly, in distances up to 28 meters, when a gas leak occurs.
The Gassonic Observer-i is suitable in all pressurized gas installations, from 2 BAR (29 psi) or more,
where the escaping gas is in a gaseous state when it leaks.
The Gassonic Observer-i can be configured to operate in Enhanced or Classic Modes. In Classic
Mode, reminiscent of the legacy Observer-H UGLD, the alarm decision is based on the user-adjustable
SPL threshold. The Classic Mode makes it possible to retrofit the Gassonic Observer-i into Gassonic
Observer and Gassonic Observer-H installations. In Enhanced Mode, the detection method is based
on the intelligent ANN algorithm that can distinguish gas leaks from background noise.
The Gassonic Observer-i is certified to ATEX, IECEx, FM, CSA, HART, and IEC 61508 standards. The
detector housing is cast AISI 316L, acid-proof stainless steel and the ingress protection is IP66 with a
NEMA rating of Type 4X. The performance of the Gassonic Observer-i as a safety device is not
covered by the ATEX certificate.
2.1. Artificial Neural Network (ANN)
An essential performance parameter for an ultrasonic gas leak detector is to ensure high
acoustic sensitivity to real gas leaks while at the same time minimizing the influence from
background noise sources, unrelated to gas leaks. To ensure this very important feature, the
Gassonic Observer-i is the first ultrasonic gas leak detector to use multi-spectral Artificial
Neural Network (ANN) algorithms in the detector’s advanced acoustic sound processing design
to distinguish real gas leaks from false alarms.
The ANN is a mathematical algorithm and is used to search for familiarity in a large and
complex set of data. ANN works very similar to how the human brain handles the constant flow
of information received through its senses - the eyes, ears, nose, and mouth. For example,
when we have seen a face of a person in their youth and heard their voice, we are often able
to recognize the person 20-30 years later, even if the person has changed over time. The
reason we can recognize the person is that our brain is not programmed to search for an exact
match or pattern, instead the brain looks for a combination of familiar similarities which the
brain has been trained to compare and then make a decision. If the human brain did not look
for familiarity when we met another person but instead looked only for an exact match as we
remembered the person, we would only recognize that person if they had not changed and
looked exactly the same.
An ultrasonic gas leak detector does not have to recognize people at different ages; instead it
needs to effectively recognize the sound signature from gas leaks while at the same time also
rejecting sound signatures from acoustic background noise unrelated to gas leaks. The
Gassonic Observer-i uses advanced ANN algorithms to enhance and optimize the detector’s
ability to distinguish between normal background noise not related to leaking gas and real gas
leaks. Due to the use of ANN technology, the Gassonic Observer-i is able to constantly record
and analyze the flow of complex acoustic sound generated in very noisy plant environments,
and instantly raise an alarm if the specific noise from a gas leak is recognized.
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The Artificial Neural Network (ANN) makes it possible to analyze the incoming acoustic sound,
based on the frequency domain instead of the sound level domain (dB levels) in individual
frequency bands. As such, the Gassonic Observer-i detects only the sound from gas leaks,
even if the gas leak sounds are occurring at much lower sound levels than the background
noise. In reality this means that the ANN is extremely immune to false alarms from unwanted
background noise sources, but at the same time extremely sensitive to gas leaks regardless of
size.
The Gassonic Observer-i analyzes acoustic noise from as low as 12 kHz where other
ultrasonic gas leak detectors have to filter out noise below 20 kHz to prevent interference from
compressors or other man-made acoustic noise unrelated to gas leaks. With the ANN multi-
spectral technology, the frequency band works down to 12 kHz, allowing more sound energy
from potential gas leaks to be picked up and analyzed which provides a greater detection
range of gas leaks.
With the ANN technology, the Gassonic Observer-i comes with pre-trained neural network
algorithms from the factory and does not require complicated onsite training procedures to
adapt to specific acoustic plant conditions; instead it is ready to operate in all kinds of
acoustical environments, immediately after installation.
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2.2. Area Monitored by Gassonic Observer-i
The Gassonic Observer-i is configured in either Enhanced or Classic Mode with SPL trigger levels as
low as 44 dB and is capable of detecting 0.1 kg/sec gas leaks at on-axis distances of up to 30 meters.
Illustrated in Figure 1, the detection area is based on actual gas leaks and represents the maximum
coverage of the Gassonic Observer-i without a solid physical obstruction between the detector and the
leak. With an increase in user-adjustable SPL trigger levels, the coverage area is equivalently
decreased. In Enhanced Mode, the ANN algorithm eliminates the need for SPL trigger levels while at
the same time filters out spurious alarms due to background nuisances, thereby increasing the leak
detection coverage in high background noise areas.
Please consult your local representative for more information on area coverage or find more
information in our UGLD Technical Handbook.
Figure 1: Detector Coverage Characteristics (seen from side view)
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2.3. Detector Outputs
The Gassonic Observer-i UGLD has the following output capabilities:
•Analog Output 4-20 mA current loop interface – Sink or Source (factory setting = Source)
•Alarm relay to indicate potential gas leak alarm
•Error Relay to indicate detector fault
•HART 6.0 interface, operates over 4-20 mA current loop interface
•Modbus serial interface, operates on two separate wires, half-duplex RS-485
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3.0 Installation
3.1. Mechanical Construction
The Gassonic Observer-i consists of two chambers. Both chambers are certified as flameproof (Ex d)
and Explosion-proof (XP). The cables are connected through M20 x 1.5 6H cable entries in the top
chamber using approved Ex d glands or approved conduit with seals installed within 18” of the
detector. The inner cores of the cable penetrating the detector should be at least 25 cm long. This will
ensure no tension on the wires and connector PCB when the top chamber is opened. The two
mounting bolts are on the top chamber of the detector so that the cables will enter on the fixed part of
the detector. The bottom part is attached to the top by means of six Allen screws with lock washers.
Unscrewing these screws will expose the connector PCB in the top chamber. These screws will be
fixed by retaining washers to the bottom chamber. The bottom chamber of the detector is supported by
the load-strap, which is connected to the top chamber.
The bottom chamber contains integral associated intrinsically safe apparatus limiting energy to an
intrinsically safe microphone and piezo source, mounted to the exterior of the enclosure.
Figure 2: Mechanical Construction – Internal
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Figure 3: Mechanical Construction – External
3.2. Mechanical Operation and Safety
When closing the top chamber ensure that the load strap and wires are not caught between the
bulkhead and the top part of the detector. Check the status of the O-ring and the flame path. Replace
the O-ring if damaged. Consult the factory for repair if the flame path is damaged.
NOTE: The ambient temperature is limited to -40ºC to +60ºC. The performance of the Gassonic
Observer-i Ultrasonic Gas Leak Detector, as a safety device per clause 1.5 of Annex II of the ATEX
Directive 94/9/EC, is not covered by the ATEX certificate.
3.2.1. Specific conditions of use
•The Class A2-70 M6x1x20 screws connecting the bulkhead flange joints must be tightened to
9 Nm using a torque wrench.
•Consult the manufacturer if dimensional information on the flameproof joints is necessary.
•Do not open when an explosive atmosphere is present. Read and understand this instruction
manual before operating or servicing.
WARNING: The inner six screws should not be unscrewed and the bottom chamber should not be
opened. The warranty will be void if the bottom chamber is opened.
Danger of electro-static sparking. Clean non-metallic parts only with a damp cloth.
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3.3. Mounting
Two M8 stainless steel bolts (not supplied), 88 mm apart, attached to the top of the detector are used
to fix the Gassonic Observer-i in its operating position. These bolts may penetrate the detector top by a
maximum of 14 mm. The detector can be mounted to a freestanding pole or wall, using the Gassonic
mounting bracket 80601-1. This bracket is an optional accessory and is supplied with two M8 mounting
U-bolts which can fit around a pole with a maximum dimension of 63 mm. It is possible to mount the
detector directly onto non-vibrating structural beams or cable-trays. The microphone should face
downwards and if tilting of the detector is necessary, the angle of incline should not exceed 45°. When
mounting the detector within half a meter of a solid structure, such as a wall or a big vessel, the
acoustic test sound source shall be pointed away from the structure. The sound source should be
pointing into free space as far as possible.
Figure 4: Mounting Diagram
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3.4. Wiring Diagram
Figure 5: Wiring Diagram
3.5. Protective Earth Grounding
Figure 6: External Earth Terminal
The protective earth ground terminal requires the use of an M5 ring lug and star washer. The wire gauge
should be less than or equal to the gauge of the power supply wires.
GASSONIC OBSERVER-i
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Figure 7: Internal Earth Terminal
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
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.
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.
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.
Error: Display shows the type of error, and the error relay is turned on. By default, the error relay is
energized.
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:
•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
GASSONIC OBSERVER-i
18
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.
A
n a
c
seco
n
soun
d
SPL
v
pred
e
repe
a
toler
a
toler
a
is dis
p
HAR
T
and
r
sequ
e
The
s
•
•
•
If no
n
can
b
Gass
o
befor
e
facto
r
Durin
displ
a
corre
s
the s
e
•
R
u
s
•
R
p
a
g
r
t
h
•
A
o
u
a
l
l
o
•S
s
y
g
o
f
o
s
e
The
G
4.3.9. A
c
c
oustic self-t
n
ds. A test si
d
source to t
h
v
alue in dB.
T
e
fined toleran
a
t the acous
t
a
nce another
a
nce, the Ga
s
p
layed and t
h
T
digital com
m
r
eturns to in
e
nce will rep
e
s
elf-test error
An obstac
l
A
faulty s
e
A faulty m
i
n
e of the abo
v
b
e tested b
y
o
nic 1701
P
e
sending t
h
r
y for service.
g
the acous
t
a
ys the last
S
s
ponding fixe
e
lf-test and c
a
4.3.10. I
n
R
emote Alar
m
s
er to reset r
e
R
estore Defa
a
rameters,
S
r
ounding the
h
e power is t
u
A
larm Test:
T
u
t the extern
l
arm mode, i
o
nger than 30
B100 Test:
y
stem wiring.
o
to alarm a
n
o
llow the dB
S
e
conds, then
4.3.11. O
G
assonic Ob
s
c
oustic S
e
est (named
gnal with a f
r
h
e microphon
e
T
his value is
ce. If the tes
t
t
ic self-test
3
acoustic self
-
s
sonic Obser
v
h
e Error Rela
y
m
unication in
t
dicating a c
e
at until the a
c
can be caus
e
l
e blocking th
e
lf-test sound
i
crophone
v
e is true, the
y
means of
P
ortable Te
s
h
e Gassonic
t
ic self-test,
S
PL reading
d current lev
e
a
n be seen th
n
puts
m
Reset: Th
e
e
lays remotel
ults: The r
e
S
PL alarm tri
pin and turn
u
rned on.
T
he Gassonic
a
l system wi
r
n which it w
i
seconds, th
e
Similar to t
h
By turning
o
n
d stay there
S
PL in the d
i
16 mA and
a
utput Met
h
s
erver-i has 4
1
9
e
l
f
-Test
Senssonic™
r
equency sw
e
e
. The detec
t
compared t
o
t
signal is ou
t
3
0 seconds
a
-
test is done
v
er-i will indic
y
is turned o
n
t
erfaces. Furt
orrespondin
g
c
oustic fault i
s
e
d by:
e sound path
source
Gassonic O
b
a ”Gain Te
s
t and Cali
b
Observer-i
the Gassoni
c
recorded i
m
e
l on the 4-2
0
rough the op
t
e
Gassonic
O
y, without ph
y
e
mote reset
gger, delay
t
ing the pow
e
Observer-i h
r
ing. Groun
d
i
ll remain un
t
e
device will
g
h
e
A
larm tes
o
n the SB10
0
until the SB
1
i
splay. For
E
a
fter delay ti
m
h
ods
major outpu
t
9
) is done e
v
e
ep at const
a
t
or analyzes
t
o
a factory re
f
t
of the pred
e
a
fter the firs
t
again 30 se
c
ate an acou
s
n
. The user
c
hermore, the
g
SPL readi
n
s
repaired.
b
server-i unit
st” with the
b
ration Unit,
back to the
c
Observer-i
m
mediately b
e
0
mA analog
o
t
ical link win
d
O
bserver-i ha
s
y
sically acce
s
pin is also
u
t
ime, etc.) b
a
e
r on. The pi
n
as provision
s
d
ing the alar
m
t
il the alarm
g
o into fault.
t, the SB10
0
0
, and pointin
1
00 is turned
E
nhanced M
o
m
e it will go to
t
methods:
G
v
ery 15 min
u
a
nt amplitud
e
t
he result of
t
f
erence valu
e
e
fined tolera
n
t
failed test.
c
onds later. I
f
s
tic error mod
c
an acquire t
h
4-20 mA ou
t
n
g until the
e
fore the sta
o
utput. A gre
d
ow.
s
a remote r
e
s
sing the Ga
s
u
sed to rest
o
a
ck to the d
n
must rema
i
s
for a remot
e
m
test pin wil
test pin is r
e
0
Test Unit
c
g it directly a
off. For Cla
s
o
de, the anal
o
20 mA.
G
ASSONI
C
u
tes and tak
e
is transmitt
e
t
he sweep a
n
e
and the res
n
ce, the Gas
s
If this test
s
f
the third tes
t
e. In this mo
d
h
e relay statu
t
put indicates
next acoust
i
rt of the tes
t
en LED is al
s
e
lay reset swi
s
sonic Obser
v
o
re some us
e
d
efault value
s
i
n grounded
f
e
alarm test.
l
l put the Ga
s
e
moved. If th
c
an be used
t the detecto
r
s
sic Mode, t
h
o
g output wil
l
C
OBSER
V
es approxim
e
d by the ult
n
d stores the
s
ult must be
w
s
onic Observ
s
ignal is still
t
signal is sti
l
d
e the “ERA
C
s via the Mo
d
1 mA for 5 s
e
i
c test failur
e
t
, and indica
t
s
o illuminate
d
i
tch that ena
b
v
er-i unit.
e
r options (
M
s
. This is d
o
f
or one minu
t
This is usefu
l
s
sonic Obse
r
e grounding
to test the
e
r
, the Obser
v
h
e analog ou
t
l go to 1.5
m
V
ER-i
ately 8
rasonic
highest
w
ithin a
er-i will
out of
l
l out of
C
” code
d
bus or
econds
e
. This
tes the
d
during
b
les the
M
odbus
o
ne by
t
e after
l to test
r
ver-i in
time is
e
xternal
v
er-i will
t
put will
m
A for 2
GASSONIC OBSERVER-i
20
•Alarm Relay Output
Can be configured as normally energized/de-energized
•Errors Relay Output
Always configured as normally energized
•4-20 mA Analog Output
Can be configured as source or sink
•Serial Digital Communication
Configurable as Dual Modbus or Single Modbus and HART (optional)
The user needs to determine the appropriate output method.
4.3.12. Relay Ratings
8 A @ 250 VAC
See graph in Section 8.2.1 for DC ratings
4.3.13. Alarm Relay Output
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 49 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.
In Enhanced Mode, the internal dB setting is referred to as the ANN Sensitivity Level. This is set
internally by means of the magnet on the display in 5 dB steps between 49 and 99 dB. The ANN
Sensitivity Level is a dB level which keeps the detector from going into alarm on a positive ANN event,
unless the SPL has past the preset ANN Sensitivity Level.
An alarm delay time is implemented to eliminate spurious alarms due to short background noise peaks.
This delay time is particularly important in Classic Mode, when ANN is not used for gas detection. The
delay time can be set between 0 and 240 seconds. The factory default setting for delay is 2 seconds in
Enhanced Mode and 10 seconds in Classic Mode. The delay can alternatively be configured via the
“Fire and Gas Panel”, Modbus or HART.
When a gas leak occurs in the detector’s coverage area and the detector is in Classic Mode, the trigger
level will be reached, the LED in the optical link window will be illuminated, and the alarm relay timer
will be started. When the delay times out, the unit will go into alarm mode.
When a gas leak occurs in the detector’s coverage area and the detector is in Enhanced Mode, the
ANN will calculate the probability of a true gas leak and will result in a positive. When the ANN
Sensitivity Level is also reached, the LED in the optical link window will be illuminated and the alarm
relay timer will be started. When the delay times out, the unit will go into alarm mode.
An alarm mode results in the following:
• The dB value preceded by an “A” (“C” in Classic mode) will flash on the display
• The alarm relay will activate
• The analog output will change according to the output mode (see Table 1)
• An event will be recorded
4.3.14. 4-20 mA Output
In normal operation, the output is between 4 and 20 mA. When using this output method in Classic
Mode, the SPL trigger is set at least 6 dB higher than the background noise, and the alarm delay time
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