Oldham OLCT IR Technical Manual
Also see for olct ir: Technical manual
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7 – Special instructions for use inATEX explosive atmospheres21Voltage at detector terminals = 30 VDC max, 16 VDC min.Max power = 5.8 Watts- Replacing screws:If you need to replace a screw from the “Ex d” flameproof housing, use an A4.70 or a screw of higher quality.- Dusty atmospheres:When using the equipment in dust explosive atmospheres, the equipment should be thoroughly cleaned on aregular basis to prevent dust buildup. The dust layer shall be less than 5 mm thick. The joints between thehousing and the sensor part or between the housing and the terminal block cover will be coated with paraffinicgrease.- Transfer curve and power supply parametersThe following curve shows the OLCT IR current output value depending on the gas concentration, specialmaintenance and fault states. In the event the user connects the transmitter to a non-OLDHAM controller, theuser must ensure that the OLTC IR transfer curve is compatible with the controller input characteristics inorder to read properly the signal from the transmitter.In addition, the controller should provide a power supply of 16 to 32 VDC at detector terminals, withintermittent peaks at 500 mA.7.2 Functional SafetyThe detector OLCTIR (CH4 and HC versions) has been certified by INERIS as SIL 2 capable according to EN 50402(Certificate INERIS 03ATEX0141X/02). This standard applies since 2005 and defines the requirements on thefunctional safety of fixed gas systems (electrical apparatus for the detection and measurement of combustible or toxicgases or vapours or of oxygen).The detector OLCT IR was designed in conformity with IEC 61508 standard.The safety function of the OLCT IR is to detect combustible gases with infrared absorption technology and to deliver a4-20mA current output proportionally to the gas concentration as a percentage of the LEL, respectively from 0 to 100%LEL. In fault mode, the output will be less than or equal to 1 mA or greater than or equal to 23mA.Maintenance Interval Test λDU PFDavg SFF DC SIL capability1 year 3.5 10-7 1.6 10-3 90% 72.3% 2λDU : Failure Rate per hour (dangerous undetected)PFDavg : Probability of Failure on DemandSFF: Safety Failure FractionDC: Diagnostic Coverage (fraction between dangerous failures rate and total failures rate).0% 100%20,0mA4,0mA2.4mAConcentrationEn % LIESortie Courant en mADéfaut23,2mADéfaut1.2mAModeMaintenance120%-10 %HorsgammeDéfaut2.0mAConcentrationin % LELOutput Current inmAFaultFaultFaultOut ofrangeMaintenancemode |
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