OLCT IR Fixed Gas Detector

Overview

Offshore platforms, petrochemical and chemical industries, naval installations, waste water treatment plants… in these types of environments, infrared technology is very often the only solution. The OLCT IR is built to withstand these harsh environments, which require the most efficient gas and flame detection.

Proven Leading-Edge Technology

“Zero Maintenance” Efficiency
The answer to false alarms
Non-intrusive calibration

Two Configurations for Adapting to Your Site

Standalone Version
Free-Fitting Version

Unrivalled Performance

Reliability
Durability

Special Version

The semi-conductor electronics of the OLCT IR guarantee extreme accuracy and constant stability.
Costs are considerably reduced:- Lifetime detector stability after initial calibration- Requires minimal maintenance
The economic implications of false alarms have led us to design the OLCT IR with the ability to ignore external elements that trigger false alarms.
Equipped with a non-intrusive system allowing a single operator to access a protected menu.
The detector can therefore be calibrated in an explosive area in total compliance with safety rules.
Includes a case fitted with a mounting system and a wiring compartment for electrical connections in explosive zones.
Magnetic system for calibrating in explosive zones without opening the compartment cover.
Includes a case fitted with a 3-wire output for connection to any approved junction box.
Highly resistant to sensor poisoning
High gas concentration does not saturate the transmitted signal
All vital functions are maintained even if an accumulation of dust or other substances reduces transmission by 70%.
Heated mirror and window to prevent misting or icing of the optics
Operates in an oxygen deficient atmosphere
Stainless steel explosion-proof compartment, secure connection compartment
The mirror is made of quartz
External optics are made of quartz capable of withstanding high pressure and abrasive substances.
Simultaneously optimises the response to various hydrocarbons, meeting the requirements for multi-hazard sites.

For more information on the OLCT IR Fixed Gas Detector, contact your local Air-Met office.

Features

4-20 mA analogue infrared transmitter
SIL2 capability
Infrared CO2 or combustible gas detector
IP67
Double source / four beams
Heated optics
Dirty optics compensation
Low maintenance
Resistant to poisons
Long lifespan (>10 years)
Non-intrusive calibration

Specifications

Detection Principle	Optics: infrared absorption
Detected Gases	Hydrocarbons Methane, propane/butane as standard Others on request including CO2
Range	0-100% LEL CH4, C3H8, C4H10 0-100% of volume CH4 0-3% of volume CO2
Housing	IP66/IP67, DIN40050
Ingress Protection	316L Stainless Steel
Sensitivity	1% LEL
Accuracy	+/-3% LEL CH4 or +/- 5% of the value +/-2% LEL HC or +/- 3% of the value
Response Time	T90 < 8 sec.
Self Test	Continuous
Calibration	In factory or locally
Humidity Range	0 to 99% (without condensation)
Output Signal	4-20 mA
Max Load Resistance	300 Ω
Trouble Signals	Line fault (0 mA) Optics fault (0.5 mA) Other fault (1 mA) Calibration mode (2 mA) Scale over range (23 mA)
Power Supply	15 to 30 VDC at detector terminal
Average Consumption	2.5 W
Connection	3 active wires, shielded cable
Maximum Resistance Per Conductor Of Detector/Central Unit Cable	8 Ω (250 m in 1.5 mm2) under 21 VCC
Type Of Cable Inlet	M20, Cable gland not supplied
Operating Temperature	-25°C to +55°C on standard version -50°C to +55°C on CH4 version (P/N WIRCH4LBT) & Propane (P/N WIRPROLBT)
Storage Temperature	- 50°C to 55°C
Weight And Dimensions	212 x 105 x 120 mm; 1.6 kg
EC Electromagnetic Compatibility	Complies with EN50270
Certifications	Ex	Ineris 03ATEX0141X Ex d e ia IIC T4- II 2GD Ex tD A21 IP66 T135C T.amb: -50°C to +65°C
	IECEx	IECEx INE 07.0005X Ex d e ia IIC T4- II 2GD Ex tD A21 IP66 T135C T.amb: -50°C to +65°C
Performance	INERIS 03ATEX0141X EN 61779-1, -4
SIL Capability	INERIS 03ATEX0141X/02 SIL capability 2 EN 50402/EN 61508