IR transmitter : OLCT IR

OLCT IR: onshore and offshore installations You encounter some of the most severe constraints and infrared technology is very often the only solution.

OLCT IR The extra-tough OLCT IR transmitter detector with infrared sensor for top performance provides top-end gas flammable detection reliability : insensible to poisoning ( silicon vapours, hydrogen sulphide, chlorinated products …) resistant to aggressive substances long-life, highly-resistant sensor low maintenance and non-intrusive calibration...

OLCT IR The transmitter OLCT IR is designed for detection of flammable gas : hydrocarbons, methane,propane/butane as standard and others on request… Note : functional in inert gas atmosphere.

OLCT IR : concept OLCT IR concept is based on measurement of infrared radiation passing through a volume of gas. Working IR pulsed source Reference IR pulsed source.

OLCT IR Since most gases have unique absorption spectra, they can easily be identified by proper selection of an infrared wave- length at which absorption is measured l ’OLCT IR = two standard versions : OLCT IR CH4 OLCT IR HC. Reference wave-length

Recommanded versions CH4 versionHC version ALCENES: ethylene,propylene,1- butene,1-3butadienne… AROMATICS: benzene,toluene,0-Xylene (m- ; p- ),Styrene... ALCANES: butane,propane,hexane, ethane, pentane... ALCOHOLS:e thanol,methanol, propanol... CETONES: acetone,2- Butanone,cyclohexanone... ETHERS: ethyl acetate, methyl methacrylate, ethyl acrylate... ESSENCES: supers,gasoil,gazole,kerozene,essence of terebenthine... SOLVANTS: White spirit...

« CH4 » = recommanded version according to these examples : ALCENES AROMATICS

« HC » = recommanded version according to these examples : ALCANES ALCOHOLS CETONES ESTHERS ESSENCES SOLVANTS...

ALCANES detection: version « HC » recommanded : –Sur l’OLCT IR HC on a moins de 15 % d’écart de sensibilité pour les alcanes non cycliques de C 2 (éthane) au C 9 (nonane) et le calibrage butane permet d’être en sécurité en cas de mélanges, tandis que cet écart dépasse 35 % sur l’OLCT IR CH4. –A titre de comparaison, on a ci-contre la réponse d’un OLCT IR CH4 à différents alcanes. –Dans le cas le cas de la présence potentielle de méthane et d’autres alcanes, l’OLCT IR CH4 permet d’assurer la sécurité de détection dans tous les cas, mais les alcanes > C 2 seront fortement surestimés.

ALCOOLS detection : version « HC » recommanded. –L’OLCT IR HC est le mieux adapté pour les alcools les plus courants. –L’interférence sur l’OLCT IR CH4 des alcools est donnée dans le graphe ci- contre.

CETONES detection : version « HC » recommanded. –L’OLCT IR HC est le mieux adapté pour les cétones les plus courantes. –L’interférence sur l’OLCT IR CH4 des cétones est donnée dans le graphe ci- contre.

ESTERS detection : version « HC » recommanded. L’OLCT IR HC est le mieux adapté pour les esters plus courants. –L’interférence sur l’OLCT IR CH4 des esters est donnée dans le graphe ci- contre.

essences et solvants detection : version « HC » recommanded. L’OLCT IR HC est le mieux adapté pour les solvants et essences les plus courants. –L’interférence sur l’OLCT IR CH4 des solvants et essences est donnée dans le graphe ci-contre.

ALCENES, aromatiques et FREONS detection : version « CH4 » recommanded. L’OLCT IR CH4 est le mieux adapté pour la détection de ces familles de gaz : ALCENES AROMATICS

OLCT IR compared with cataltytic cells : major advantages High gas concentration does not saturate the transmitted signal insensitive to poisoning low dispersion of response to various gases presence of oxygen is not required humidity ( without condensation) has no influence on accuracy the gas flow rate has no influence on accuracy.

Other ADVANTAGES  Proven high reliability and long-term stability  no calibration (1) and low maintenance required during equipment lifetime (10 to 15 years)  Automatic self test  Immunity to poisonning from H2S, silicone and other agents (1) OLCT IR has a continous self-test function

Proven leading-edge technology « low maintenance » efficiency: electronics of the OLCT IR guarantee extreme accuracy and constant stability... The answer to spurious alarms: an ability to ignore external substances that trigger false alarms... non -intrusive calibration (magnetic switch)

OLCT IR : maintenance The OLCT IR has been designed to requiere a minimum of maintenance : it ’s only necessary to inspect visually that the weather protection is not clogged in heavily contaminated areas and be sure that the optical surfaces are clean*. * use an equal-part mixture of isopropyl alcohol and water.

Two configurations for adapting to your site : Housing « E » = standalone version, fitted with a terminal compartment and a cable gland. Housing « M25 » = free- fitting version, fitted with a threading and 3-wire output for electrical connections.

DIMENSIONS  WEIGHT: 2,3 to 3,1 kgs

INSTALLATION : indications –The location of each detector should preferably be determined at the system design stage : –where gas leakage is most likely to occur –It should be considered whether the gas in question is heavier or lighter than air ? –The detector can be used with the weather protection (réf : ) –The detector should not be mounted where it could be exposed to water drenching

INSTALLATION : orientation –L’OLCT IR must be mounted so that the flow direction indicator must point upwards.

INSTALLATION : information –Housing “ E ” must be mounted so that the longitudinal axis of OLCT IR is horizontal. –This will prevent accumulation of water and dust on the optics –for this purpose, mounting bracket is avaible : réf :

Accessories Calibration sample flow housing. Leather test nozzle: allows the functional test by injecting a calibration gas.

Accessories Weather protection kit : Mounting bracket:

Accessories « mosquito » Filter Weather protection

Accessories Interface-module allows a direct transmetter 4-20mA linking to a channel initially connected with a catalytic gas detector (analog signal in mv): and that, without other modifications of installation (cable…), wiring and electronics (control unit) !

TECHNICAL CARACTERISTICS  Detection range: % LEL  response time : T50 < 10 secondes with calibration cap  power supply: 16 à 30VCC, 3 active wires max. resistance per wire capt./control unit = 16 ohms ( 500 m with 1,5 mm2) and with 21 VCC of power 4-20 mA signal : max. impedance = 300 ohms average power consumption = 8W (max 12W)  IP66  Housing material: stainless steel 316L  Operating temperature: from -30°C to + 55°C Storage temperature : from 0 to +30°C.

Main applications: Offshore Platforms, petrochemical plants, Chemical industries, Reffineries, Marine, Waste disposal plants …