Transcript OLCT IR - SVECOM

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
Reference wave-length
• Since most gases have unique
absorption spectra, they can
easily be identified by proper
selection of an infrared wavelength at which absorption is
measured
• l ’OLCT IR = two standard
versions :
• OLCT IR CH4
• OLCT IR HC .
Recommanded versions
• CH4 version
• HC version
• ALCANES:butane,propane,hexane,
ethane, pentane ...
• ALCOHOLS:ethanol,methanol,
• ALCENES:
ethylene,propylene,1butene,1-3butadienne…
• AROMATICS:
benzene,toluene,0-Xylene
(m- ; p- ),Styrene...
propanol...
• CETONES:acetone,2Butanone,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
OLCTIR CH4 calibré CH4 : Réponse calculée aux aromatiques
100,0
90,0
80,0
Rep [% LIE CH4]
70,0
Méthane CH4
Benzène C6H6
Toluène C7H8
o-Xylène C8H10
m-Xylène C8H10
p-Xylène C8H10
Styrène C8H8
60,0
50,0
40,0
30,0
20,0
10,0
0,0
0,0
10,0
20,0
30,0
40,0
50,0
Conc [% LIE]
60,0
70,0
80,0
90,0
100,0
« HC » = recommanded version
according to these examples :
ALCANES
ALCOHOLS
CETONES
ESTHERS
ESSENCES
SOLVANTS ...
OLCT IR HC calibré C3H8 : Réponse calculée aux essences & solvants
100.0
90.0
80.0
70.0
Rep [% LIE C3H8]
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Propane C3H8
Butane C4H10
Super SP98
Super plombé 97
Gasoil ou Gazole C9 - C25
Kérosène (JP4) C10 - C16
Essence de térébenthine (Turpentine)
White Spirit
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0
10.0
20.0
30.0
40.0
50.0
Conc [% LIE]
60.0
70.0
80.0
90.0
100.0
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 » = freefitting 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 : 6124976)
– 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 :
6132380.
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: 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 .
Main applications:
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Offshore Platforms,
petrochemical plants,
Chemical industries,
Reffineries,
Marine,
Waste disposal plants …