Infrared
Technology
• Combustible Hydrocarbon Detector
• 5
Year Warranty
• Self Diagnostic Optical Detector
Detcon CH
infrared sensors are designed to detect and monitor combustible hydrocarbon
gases in the lower explosive limit range (%LEL). The sensors utilize a
non-dispersive, subminiature detector assembly that contains an IR light
source, an active wideband pyroelectric detector and a reference pyroelectric
detector. The IR light source and both detectors are packaged as a plug-in
field replaceable optical sensor module.
Two models are available,
Detcon Model IR-522 and Detcon Model IR-622. Both models feature Detcon’s
unique and intuitive MicroSafe™ software. Operator interface is
nonintrusive via a small handheld magnet. Embedded intuitive software guides
the operator through configuration programming and simple calibration
procedures. Both sensor assemblies are certified by CSA and UL for installation
in Class I, Division 1, Group B C D areas. Both sensor assemblies are certified
to a very demanding performance standard.
Carbon
Dioxide
IR-540W and IR-640W are specifically designed to detect and
monitor Carbon Dioxide. See
the Carbon Dioxide section of the web site and the CO2 brochure for
complete information.
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Principle of Operation
 IR
sensors operate on the principle of infrared light absorption as a means to
detect the presence of combustible hydrocarbon gases. The Detcon IR sensor uses
a miniature plug-in optical detector in a stainless steel housing. The target
gas diffuses through a sintered stainless steel flame arrestor and into an
optical cavity. A lamp provides a cyclical IR radiation source that contacts
two pyroelectric detectors. These “active” and “reference”
detectors each give an output that measures the intensity of the radiation
contacting their surface. The active detector is covered with a filter specific
to the IR spectrum where hydrocarbons absorb and the reference detector has a
filter specific to the non-absorbing part of the IR spectrum. Hydrocarbon gases
absorb a fraction of the IR radiation and the active detector signal decreases.
The reference detector signal remains unchanged in the presence of the target
gas. The ratio of the active and reference detector signals is used to compute
the gas concentration. By using the ratio, drift caused by changes in the lamp
intensity or optical reflectivity is eliminated. |
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Detectable Gases
| Acetone |
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1, 4 Dioxane |
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Isobutanol |
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Pinene |
| Benzene |
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Ethane |
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Methane |
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Propane |
| Butanamine |
|
Ethanol |
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Methanol |
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Propanol |
| Butane |
|
Ethyl Ether |
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Methyl Ethyl Ketone |
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Propylene |
| Butene |
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Ethylene |
|
Methyl Isobutyl Ketone |
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Pyridines |
| Cyclohexane |
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Ethylene Oxide |
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Octane |
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Tetrahydrofuran |
| Cyclohexene |
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Heptane |
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Octene |
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Toluene |
| Cyclopropane |
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Heptanone |
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Pentane |
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Trimethyl Amine |
| Dimethyl Amine |
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Hexane |
|
Pentanone |
|
Vinyl Ether |
| Dimethyl Ether |
|
Hexene |
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Pentene |
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Xylene |
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