General Monitors Observer-i Ultrasonic Gas Detector
The Observer-i Ultrasonic Gas Detector from General Monitors uses Gassonic ultrasonic technology to instantly detect pressurised gas leaks. This highly precise acoustic detector works when traditional gas detection equipment is not suited or dependent on ventilation.
The GM Observer-i can analyse sounds as low as 12 kHz due to no common high pass filters being used. Broader leak detection can be activated which in turn increases sensitivity to smaller gas leaks, without interference from unwanted background noise.
This detector requires no alarm setpoints or trigger levels to be configured and alarm parameters do not need to be adjusted. Additionally, the Observer-i is backwards compatible with earlier versions of the Observer, thanks to its classic mode setting.
- Improved detection range and background noise rejection - preventing false alarms
- Integrated Senssonic self-test
- The capability of storing faults, sound checks, calibrations, and alarm history
- Detects gas leaks from 2 bar (29 psi) pressure
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: Ex d ia IIB+H2 Gb T6, Ex tb IIIC T85°C Db (Ta = –40°C to +60°C)
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, CSA, FM, IECEx, CE
HART 6.0 registered
FM certified to IEC 61508 (SIL 3) |
Accessories |
1701 Test and Calibration Unit
SB100 Bump Test Tool |
Device Drivers |
DDL, DTM available at MSAsafety.com |
Warranty |
2 years |
Electrical Specifications |
|
Input Power |
15–36 VDC, 250 mA max. 24 VDC, 170 mA nominal |
Relay Ratings |
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: 4–20 mA, 40–120 dB (u)
ANN Mode: 4–12 mA, 40–120 dB (u) 16 mA, warning 20 mA, alarm |
EMC/RFI |
EMC Directive 2004/108/EC 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 |