Observer-i
Observer-i
Observer-i

General Monitors Observer i Ultrasonic Gas Leak Detector

Code: Observeri-1-1-1-1-1-1
  • High-precision, omni-direction acoustic detector
  • Instantly detect pressurised gas leaks
  • Detects gas in challenging situations where traditional methods fail or require ventilation

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The Observer-i from General Monitors is the first ultrasonic gas leak detector that uses real-time broadband acoustic sound processing technology based on Artificial Neural Network (ANN). The development of this technology was based on extensive studies and recordings of gas leak sounds and industrial background noise from various industry sources. The ANN algorithm has been “trained” using these recordings to automatically differentiate between unwanted acoustic background noise and dangerous gas leaks.

ANN technology allows a thorough sound spectrum analysis of as low as 12 kHz without common high-pass filters. This results in a broader range for detecting leaks and a higher sensitivity to minor gas leaks, all while avoiding interference from unwanted background noise.

Thanks to ANN technology, the Observer-i can be easily installed without any time-consuming “training” sequences. It provides an industry-leading detection distance and effectively suppresses false alarms. Moreover, the ANN technology ensures that the Observer-i has consistent gas leak detection coverage even in high and low-noise areas. The device does not require any alarm set points or trigger levels to be configured, and the alarm parameters do not need to be adjusted if background ultrasound varies over time.

The Observer-i is backwards compatible with earlier versions of the Gassonic Observer using the Classic Mode setting wherein ANN is disabled, and the legacy electrical interface is used.

The Observer-i comes with the Senssonic self-test function, a patented feature. This function performs a thorough self-test every 15 minutes and ensures the device’s electrical components and microphone work correctly. It continuously monitors the microphone and windscreen to ensure the detector maintains the optimal sensitivity and detection coverage level. This ensures that the Observer-i is operating optimally.

Applications

  • Floating Production Storage and Offloading Vessels (FPSOs)
  • Gas Compressor and Metering Stations
  • Gas Storage Facilities
  • Hydrogen Storage Facilities
  • LNG / GTL Trains
  • LNG Re-gasification Plants
  • Offshore and Onshore Oil and Gas Installations
  • Petrochemical Processing Plants

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Title Size
Observer-i Datasheet 253 KB
Observer-i Configurator 42 KB
Observer-i Manual 1 MB

Additional information

Weight 0.190 kg

Specifications

SYSTEM SPECIFICATIONS
DETECTOR TYPE Ultrasonic (acoustic) gas leak detector
BACKGROUND NOISE REJECTION METHOD Artificial Neural Network (ANN)
GAS LEAK RECOGNITION METHOD Artificial Neural Network (ANN)
MIN. ACOUSTIC DET. FREQUENCY (ANN MODE) 12 kHz
MIN. DETECTION LIMIT 40 dB (u)
ACCURACY ±3 dB
SELF-TEST Performed every 15 minutes
MIN. PRESSURE REQUIREMENT 2 BAR (29 psi)
DETECTOR COVERAGE (REF. METHANE) Enhanced Mode (ANN) (@ 0.1 kg/sec):
FQHI setting (59 dB ANN sensitivity level):
17 meters (56 ft.) Default
Ultra-high to medium background noise
FQLO setting (54 dB ANN sensitivity level):
28 meters (92 ft.)
Medium to low background noise
Classic Mode (@ 0.1 kg/sec):
Ultra-high: 7 meters (23 ft.) w/84 dB T.L.
High: 12 meters (39 ft.) w/74 dB T.L.
Medium: 18 meters (59 ft.) w/64 dB T.L.
Low: 24 meters (79 ft.) w/54 dB T.L.
RESPONSE TIME < 1 s (speed of sound)
APPROVALS CLASSIFICATION ATEX/IECEx:
II 2 G D
Ex db ia IIB+H2 T6 Gb, Ex tb IIIC T85°C Db
CSA:
Ex d ia IIB+H2 Gb T6, Ex tb IIIC T85°C Db
FM/CSA:
Class I, Div. 1, 2 Groups B,C,D;
Class II, Div. 1, 2 Groups E,F,G; Class III, T5
(Ta = -40°C to +60°C)
APPROVALS ATEX, CE, UKEx, CSA, FM, IECEx, Inmetro, SANS
HART 6.0 registered
FM certified to IEC 61508 (SIL 3)
ACCESSORIES 1701 Test and Calibration Unit
DEVICE DRIVERS DDL, DTM available
WARRANTY 2 years
ELECTRICAL SPECIFICATIONS
INPUT POWER 15-36 VDC, 250 mA max.
24 VDC, 170 mA nominal
RELAY RATINGS (OPTIONAL) 8 A @ 250 VAC
CURRENT OUTPUT (SINK OR SOURCE) Status Indications:
0 mA: Start up, no power
1 mA: Pulsed acoustic error
3 mA: Unit inhibit
Classic Mode:
4-12 mA, 40-120 dB (u)
ANN Mode:
4-12 mA, 40-120 dB (u)
16 mA, warning
20 mA, alarm
EMC/RFI EMC Directive 2014/30/EU
EN 61000-6-2, EN 61000-6-4
SERIAL DIGITAL COMMUNICATION HART, Modbus
CABLE REQUIREMENTS Max. cable length between Observer-i and power source @ 24 VDC (20 ohm)
2.08 mm2 (14 AWG) – 1,809 m (5,928 ft)
ENVIRONMENTAL SPECIFICATIONS
OPERATING TEMPERATURE RANGE -40°C to 60°C (-40°F to 140°F)
OPERATING HUMIDITY RANGE 10-95% RH, non-condensing
MECHANICAL SPECIFICATIONS
HOUSING Stainless Steel AISI 316L
DIMENSIONS 203 x 203 x 201 mm
(7.99 x 7.99 x 7.91 in)
WEIGHT 7.5 kg (16.6 lbs)
CONDUIT ENTRIES M20 x 1.5 (additional ¾“ NPT adapter available)
MOUNTING HOLES 2 x mounting screws – M8 x 19 max
INGRESS PROTECTION IP66 / Type 4X
STANDARD CONFIGURATION OBSERVER i-1-1-1-1-1-1

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