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IR transmitter : OLCT IR

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.

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IR transmitter : OLCT IR

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  1. IR transmitter : OLCT IR

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

  3. 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...

  4. 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 .

  5. 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.

  6. 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

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

  8. « CH4 » = recommandedversion according to these examples : • ALCENES • AROMATICS

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

  10. 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 .

  11. 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

  12. 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)

  13. 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.

  14. 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.

  15. DIMENSIONS WEIGHT: 2,3 to 3,1 kgs

  16. 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 : 6124976) • The detector should not be mounted where it could be exposed to water drenching

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

  18. 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 : 6132380.

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

  20. Accessories Weather protection kit : Mounting bracket:

  21. Accessories « mosquito » Filter • Weather protection

  22. 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) !

  23. TECHNICAL CARACTERISTICS • Detection range: 0-100 % 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 .

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

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