Open Path (OPECL) IR Gas Detector0 pages

"SPECIFICATION DATA Infrared Hydrocarbon Gas DetectorOpen Path Eclipse nnModel OPECL nn

DESCRIPTION

The Model OPECL IR Gas Detector delivers superior open-path infrared combustible gas detection for protection of oil/gas and other industrial facilities. With a single OPECL pair capable of covering a sensing path between 5 and 120 meters, the OPECL system offers industry leading features including dual xenon flashlamps, stainless steel construction, HART and MODBUS communication protocols, ease of installation and alignment, field replaceable transmitter and receiver modules, and a standard 2 year warranty. The OPECL system is especially useful for perimeter monitoring and applications where combustible gas/vapor leaks can happen over a widely dispersed area. The system is optimized for low maintenance, no false alarms, and low cost, and is housed in flameproof enclosures approved for use in Class I, Div. 1, IECEx, EExe and Zone 1 hazardous areas. The OPECL system utilizes onboard heaters in both modules to melt snow and ice, enabling unattended and uninterrupted operation in inclement weather. POWER CONSUMPTION (Per Module)ٗ Transmitter 5.0 watts nominal @ 24 Vdc, 6.9 watts @ 30 Vdc.5.8 watts peak @ 24 Vdc, 7.5 watts peak @ 30 Vdc. Receiver Without Relays 6.0 watts nominal @ 24 Vdc, 7.6 watts nominal @ 30 Vdc. >

nn

THEORY OF OPERATION

Receiver With Relays The OPECL transmitter module illuminates a direct linear path ending at the OPECL receiver module. As flammable hydrocarbon gases intersect the light beam between the two modules, certain IR wavelengths are absorbed by the gas, while other IR wavelengths are not. The amount of IR absorption is determined by the concentration of the hydrocarbon gas. A pair of optical detectors and associated electronics located in the receiver module measure the absorption. The change in intensity of the absorbed light (active signal) is measured relative to the intensity of light at a non-absorbed wavelength (reference signal). 6.4 watts nominal @ 24 Vdc, 8.0 watts nominal @ 30 Vdc. TRANSMITTER LAMPS Two xenon flashlamps, field-replaceable module. WARM-UP TIME 1 minute for transmitter. 30 seconds for receiver from power-up when correctly aligned. CURRENT OUTPUTח Linear 4 to 20 mA (isolated/non-isolated) rated at 600 ohms maximum loop resistance @ 24 Vdc operating voltage. >

nn

SPECIFICATIONS

VISUAL STATUS INDICATOR Tri-color LED:
Red = Alarm or calibration (receiver only)
Green = Power on / OK
Amber = Fault / warm-up INPUT VOLTAGE (Both Modules)ח 24 Vdc nominal. Operating range is 18 to 30 Vdc.
Ripple cannot exceed 0.5 volts P-P. >
5.1 >
Detector Electronics Corporation 2008 2/08 90-1159 size="-1">

"