IREX is a fast response sinter-free, fully featured infrared gas detector that produces an mV Wheatstone Bridge output as used on conventional pellistor based systems.

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Quick Overview

Overview

IR Technology versus Pellistor

Pellistors do not fail safe	Sensors can be ‘poisoned’ and rendered insensitive to gas by silicones, lead, sulphurs and chlorinated compounds.
Pellistors are high maintenance	Sensors must be regularly tested with gas to ensure they are stilloperational. Sensors typically last 3-5 years, after which they must beexchanged.
Pellistors must be operated behind a sinter (flame arrestor)	Sinters may become blocked, thus preventing gas from reaching thesensor.
Pellistors may burn out	If exposed to gas concentrations in excess of 110% LEL.
Pellistors need oxygen	Their ability to detect gas reduces significantly in oxygen deficientatmospheres.

Low power

IREX consumes less than 1W of power - ensures compatability with a wide range of control systems

Dependable

Independantly tested for reliability and performance in harsh offshore conditions by Micropack Engineering Ltd - demonstrates IREX will operate dependable in any application
3rd party approval to the performance standard EN60079-29-1
Employs sophisticated systems and algorithms - ensures reliable operation at all times
T90 response time of less than 4 seconds - rapid indication of hydrocarbon gas hazards
Optical components are treated with a STAY-CLIR coating - prevents partial obscuration in condensing atmospheres

Easy to maintain

No adjustments are necessary at the detectors, zero and span adjustments (if required) are performed at the control panel only - saves significant time and cost
Test can be applied remotely via a tube to the standard weather cover
Sinter-free operation - unlike a pellistor sensor, there is no risk of a sinter becoming blocked

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Details

Size	120 x 55 x 130mm (1.7 x 5.1 x 3.3ins) (with spigot gland)
Weight	1.5kg (10.8oz)
Ingress protection	IP66
Enclosure material	316 stainless steel
Power	800mW nominal
Connection	Supplied either with M20 spigot gland for insallation into existing junction boxes or with one M20 cable gland entry
Operating voltage and current	3Vdc nominal (2.9-3.2Vdc) 260mA nominal (260-280mA)
Electrical output	3-wire mV (Wheatstone) Bridge. Typically 10-20mV per % vol. methane
Operating temperature	-40°C to +75°C
Humidity	0 to 100% RH non-condensing
Repeatability	+/- 2% FSD
Zero drift	+/- 2% FSD per year maximum
Response time	T-90 <4 seconds
Performance	Tested in accordance with EN60079-29-1
Functional safety	Validation to IEC61508 SIL 2
Approvals	II 2 G Exd IIB + H2 T6 (-40 to +50°C) T4 (-40 to +75°C) ATEX & IECEx
EMC compliance	EN 50270, FCC, ICES-003