OLC(T) 20_rev C.2_ EN
Contents
1. Power supply Power consumption Load resistance Line length shielded cable Intrinsic safety version Characteristics of ZENER barrier Supply voltage for barrier Voltage on detector terminals Power consumption Load resistance Line length shielded cable Output signal Source mode current Max current Fault current Miscellaneous Ingress Protection Weight Dimensions voltage on detector terminals 15 V to 30 V 3 wire version 100 mA 2 wire version 25 mA maximum resistance 250 ohms 3 wire version 1 km as 3x 1 5 mm 32 ohms in loop mode 2 wire version 4 km as 3x 1 5 mm 32 ohms in loop mode 28 V 300 ohms 19 V to 26 V 10 V to 26 V 25 mA max 47 ohms 1 km as 3x 1 5 mm 32 ohms in loop mode 4 20 mA 25 mA lt l mA IP66 800 g 60 X 120 mm 17 18 8 Specific Instructions for use in Explosive Atmospheres according to European Directive ATEX 94 9 EC The OLC OLCT 20 gas detectors comply with the requirements of European Directive ATEX 94 9 EC relating to explosive Dust and Gas atmospheres As a result of their metrological performance as tested by the Approval Agency INERIS the OLC OLCT 20 gas detectors designed to measure explosive gasses and oxygen are classified as safety devices and may therefore contribute to limiting the risk of explosion The information contained in the following paragraphs should be respected and taken into account by the manager of the site2. means nor used as the basis for the manufacture or sale of OLDHAM equipment or for any other reasons without prior consent from OLDHAM WARNINGS This document is not contractually binding In the interests of its customers OLDHAM reserves to modify the technical specifications of its equipment without notice in order to improve its performance READ THIS MANUAL CAREFULLY BEFORE FIRST USE OF THE EQUIPMENT this manual must be read by any person who is or will be responsible for using maintaining or repairing this equipment This equipment will only provide the announced performance levels if it is used maintained and repaired according to OLDHAM directives by OLDHAM personnel or by personnel approved by OLDHAM GUARANTEE 2 years guarantee in normal conditions of use on parts and technical labour return in our workshops excluding consumables sensors filters etc 1 RR N A A CONTENTS Description HR 5 1 1 General sinus nn ala ua 5 1 2 Main characteristics of the various versions 5 1 3 Mechanical installation of the various versions 6 Wiring ALLANDE MES nn te elia 7 2 1 3 Wire version OLC 20d OLCT 20d i 7 2 2 2 wire versions OLCT 20d ie 7 2 3 2 wire Intrinsic Safety versions OLCT 201 iii 8 Mamntenance acalaa rara 9 Sil Detector QLC 20 seria ote 9 Je Ealibration re GR RELA RENI ARA La ice 9 3 1 2Replacing a sensor on an OLC 2023 a ila 10 3 2 Transmitters OCCT A
3. 1 General 1 2 OLC 20 gas detectors are catalytic type detectors intended for the detection of combustible gases They are flameproof certified OLC 20d OLCT 20 gas detectors are 4 20 mA transmitters and are intended for the measurement of combustible and toxic gases and oxygen They are either flameproof certified OLCT 20d or intrinsically safe certified OLCT 201 OLC 20s and OLCT 20s are available in NPT or M25 screw fittings and are designed to be attached on a junction box or any compatible generic transmitters Main characteristics of the various versions LEL LEL TOX 02 Flameproof design X X X Intrinsic safety design X 3 wire cable Wheatstone bridge X 3 wire cable 4 20 mA output X 2 wire cable 4 20 mA output X Catalytic sensor X X Electrochemical sensor X Replaceable sensor X Replaceable and pre calibrated sensor X X 1 3 Mechanical installation of the various versions Please ensure you read the paragraph Special Specifications for use in Potentially Explosive Atmospheres in Accordance with European Directive ATEX 94 9 EC See Appendix 1 for general installation instructions i 120 Figure 1 Dimensions A Dimensions OLC OLCT 20 Cable length 0 2 m 2 Wiring arrangements Please ensure you read the paragraph Special Specifications for use in Potentially Explosive Atmospheres in Accordance with European Directi
4. 1000 EN 50054 1998 EN 50057 1998 Ex 112 GD Ex d IIC T6 Gb Ex tb IIIC T85 C Db IP66 T Amb 20 C to 70 C Ex 111 GD Ex 1a IIC T4 Ga Ex ia MIC T135 C Da IP66 T Amb 20 C to 70 C Ex IMI Ex ia I Ma T Amb 20 C to 70 C INERIS 01ATEX0004X INERIS Parc Alata 60550 Verneuil en Halatte France INERIS 00 ATEX Q403 INERIS Parc Alata 60550 Verneuil en Halatte France Note les OLC 20 et OLCT 20 sont compatibles avec les centrales de d tection are compatible with gas controllers MX 15 MX 32 MX 42A MX 43 MX 48 MX 52 MX 62 and WINGAS ID Directive Europ enne CEM 2004 108 CE du 15 12 04 Compatibilit Electromagn tique The European Directive EMC 2004 108 CEE of 15 12 2004 Electromagnetic compatibility Normes harmonis es appliqu es Harmonised applied Standards EN 50270 2006 type 1 et2 CEM Appareils de d tection de gaz EMC Apparatus for the detection of gases Page 1 sur 2 page 1 out of 2 CE_atex CEM olct20 ind h 29 f i DECLARATION DE CONFORMITE CONSTRUCTEUR OLDHAM Manufacturer Declaration of Conformity S curit de fonctionnement Functional Safety Normes appliqu es EN 50402 Applied Standards L analyse de fiabilit objet du rapport INERIS n CGR 74448 du 06 juillet 2006 a permis de d terminer le taux de d faillances dangereuses non d tect es pour les OLC 20 et OLCT 20 pour gaz combustibles The reliability analysis based on INERIS report n
5. 8 01 14 ETS Oldham S A S Michel Spellemaeker Z L EST CS 20417 Director of Product Management 62027 ARRAS Cedex FRANCE ISO 14001 www oldhamgas com CE_atex_CEM_olct20_ind h CERTIF 30 31 nee OLDHAM The Fixed Gas Detection Experts EUROPEAN PLANT AND OFFICES Z l Est rue Orfila CS 20417 62027 Arras Cedex FRANCE T l 33 0 3 21 60 80 80 Fax 33 0 3 21 60 80 00 Website http www oldhamgas com AMERICAS ASIA PACIFIC EUROPE Tel 1 713 559 9280 Tel 86 21 3127 6373 Tel 33 321 608 080 Fax 1 281 292 2860 Fax 86 21 3127 6365 Fax 33 321 608 000 americas oldhamgas com sales oldhamgas com info oldhamgas com
6. CGR 74448 of 06 July 2006 has determined that the dangerous failure rate for OLC 20 and OLCT 20 for combustible gases is Aau 4 42 10 par an per year Les d tecteurs de gaz explosibles et d oxygene type OLC 20 et OLCT 20 ont un niveau OLC 20 and OLCT 20 combustible and oxygen gas detectors are SIL 2 avec un intervalle de maintenance Ti de 3 mois au plus PFD 0 55 10 SIL 2 compliant with a maintenance interval no greater than 3 months SIL 1 avec un intervalle de maintenance Ti de 6 mois au plus PFDayg 1 1 107 SIL 1 compliant with a maintenance interval no greater than 6 months Note Les taux de d faillances calcul s ne sont valables que durant la dur e de vie r elle des l ments sensibles intervalle de temps limit de l ordre de 3 5 ans Au del de par le vieillissement des cellules de mesure le taux n est plus significatif La norme EN50402 assume pour les modules simples comme les capteurs OLC 20 et OLCT20 une proportion effective de d faillance en s curit SFF comprise entre 60 et 90 Note The calculated failure rates are only valid on the real lifetime of the sensitive elements limited time about 3 to 5 years Beyond that due to ageing of the measuring cells the rate is not significant any more The EN50402 standard assumes for the simple modules like OLC 20 and OLCT20 detectors an effective Safety Failure Fraction SFF between 60 and 90 Page 2 sur 2 page 2 out of 2 Arras le 2
7. E 10 3 2 Cahbrationa una ee E ae it A E A 10 3 2 2Calibration Species esa 12 3 3 Replacing a sensor on OLCT 20 sister kin 12 3 4 Disposal ot DECO iR lehnt 12 Spare PARTS ansehe 13 4 1 OLC 20 flameproof gas detector A A HERE 13 2 OLCT 20 flameproof Sas detectoren anena Re ans aE ae 13 4 3 OLCT 20 Intrinsic Safety detector iia 14 ACCESssorles vii aaa 15 Technical characteristics Of OLC 20 220u2000000000000000000000000000000000000000000 17 Technical characteristics Of OLCT 20 200 2200020000000000000000000000000000000 17 Specific Instructions for use in Explosive Atmospheres according to European Directive ATEX 94 9 EC scccsssssssccsssssssccssssssscccsssssecsees 19 8 1 Specifications for mechanical and electrical installation in Classified Areas 19 Sil Flameproordetectors Di A A A pelare 19 8 1 2 Intrinsic safety detectors 1 OLCT 201 19 8 2 Metrological specifications for explosive gas and oxygen measurement detectors 20 8 2 1 Technical Specifications and Special Instructions for explosive gas detectors 21 8 2 2 Technical Specifications and Special Instructions for Oxygen detectors 25 e 26 8 3 1 Flameproof certified version OLC 20d and OLCT 20 d 26 8 3 2 Intrinsic safety version OLCT 20 1 kan 26 9 Recommendatuons nua 27 10 EC Declaration of Conformity cccssscccssssssccssssssssccssssssscccsssssecsees 29 1 Description 1
8. SV 4B MX 15 MX 32 MX 42A MX 43 MX 48 and MX 52 OLCT 20 explosive gas detectors comply with European standards EN 50054 and EN 50057 for Methane calibration gas Propane and Hydrogen gasses following response curves where they are used with SV 4B MX 15 MX 32 MX 42A MX 43 MX 48 MX 52 and MX 62 OLDHAM controllers or where they are connected to measurement devices with 4 20 mA inputs in accordance with paragraph 1 5 of Appendix II of the ATEX 94 9 EC Directive and are compatible with their characteristics cf transfer curve Oxygen detectors OLCT 20 oxygen detectors comply with European Standard EN 50104 where they are used with MX 15 MX 32 MX 42A MX 43 MX 48 MX 52 and MX 62 OLDHAM controllers or where they are connected to measurement devices with 4 20 mA inputs in accordance with paragraph 1 5 of Appendix II of the ATEX 94 9 EC Directive and are compatible with their characteristics cf transfer curve 20 8 2 1 Technical Specifications and Special Instructions for explosive gas detectors 8 2 1 1 Transfer curves for OLCT 20 detectors The following curve shows transmitter output current values as a function of gas concentration Where the user connects the transmitter to a device other than a device manufactured by OLDHAM he must check that the transfer curve is fully compatible with its input characteristics to ensure that the information generated by the transmitter is correctly interpreted Equally the devic
9. USER MANUAL OL C OL CT 2 0 Gas Detector gt Ap OLDHAM The Fixed Gas Detection Experts Part Number NPO20GB Revision C 2 GAS DETECTION We are delighted that you have chosen an OLDHAM instrument and would like to thank you for your choice We have taken all the necessary measures to ensure that your instrument provides total satisfaction Now it is important to read this document carefully EXTENT OF RESPONSIBILITY OLDHAM declines its responsibility towards any person for material damage physical injury or death resulting wholly or partly from inappropriate use installation or storage of its equipment resulting from failure to observe instructions and warnings and or standards and regulations in force OLDHAM neither supports nor authorises any company physical or moral person to assume responsibility on behalf of OLDHAM even if it is involved in the sale of OLDHAM products OLDHAM cannot be held responsible for direct or indirect damage or be required to pay direct or indirect compensation resulting from the sale or use of any of its products IF THESE PRODUCTS HAVE NOT BEEN DEFINED AND CHOSEN BY OLDHAM FOR THEIR SPECIFIC USE CLAUSES CONCERNING PROPERTY Drawings plans specifications and information included in this document contain confidential information that is the property of OLDHAM None of this information may be reproduced copied divulged or translated by physical electronic or any other
10. a Soci t Industrial Scientific Oldham ZI Est 62000 Arras France atteste que les The Company Industrial Scientific Oldham Z Est 62000 Arras France declares that Detecteurs de gaz OLC 20 et OLCT 20 Gas detectors OLC 20 and OLCT 20 sont conformes aux exigences des Directives Europ ennes suivantes comply with the requirements of the following European Directives D Directive Europ enne ATEX 94 9 CE du 23 03 94 Atmospheres Explosives European Directive ATEX 94 9 CE dated from 23 03 94 Explosive Atmospheres Normes harmonis es appliqu es r gles de construction EN 60079 0 2009 EN 60079 1 2007 EN 60079 11 2012 Harmonised applied Standards rules of construction Normes appliqu es m trologie Applied standards metrology Marquage marking OLC20d ou or OLCT20d Attestation CE de Type du mat riel EC type examination certificate D livr par l Organisme Notifi num ro 0080 Issue by Notified Body No 0080 Notification Assurance Qualit de Production Notification of the Production QA D livr par l Organisme Notifi num ro 0080 Issue by Notified Body No 0080 EN 60079 26 2007 EN 60079 31 2009 EN 50104 2002 Exigences d aptitude la fonction des d tecteurs d oxygene Performance requirements of detectors for oxygen Exigences d aptitude la fonction des d tecteurs de gaz inflammables Performance requirements of detectors for flammable gases M thane Methane capteur sensor standard C
11. d during the training course provided by OLDHAM or by a person authorized by OLDHAM Adjustment of 0 in clean air using potentiometer item 1 OLCT 20 sensor module Adjustment of LEL TOX O sensitivity with standard gas using the potentiometer item 2 3 3 Replacing a sensor on OLCT 20 When When the sensor is damaged or cannot be calibrated Ona preventive basis How Switch off the relevant measuring channel Remove the sensor to be replaced Replace it with a new precalibrated unit Switch the channel back on and check that it operates correctly 3 4 Disposal of OLC T 20 Concerning the conservation of the protection and the improvement of the quality of the environment as well as for the protection of the health of the persons and the careful and rational use of natural resources OLCT 20 has to be the object of a selective collection for the electronic equipments and cannot be scrapped with the normal domestic waste The user thus has the obligation to separate the OLCT 20 of the other waste so as to guarantee that it is recycled in a sure way at the environmental level For more details of the existing sites of collection contact the local administration or the distributor of this product 12 4 Spare Parts Ah Use only genuine spares otherwise the reliability of the equipment could be adversely affected 4 1 OLC 20 flameproof gas de
12. e must supply a suitable power supply voltage allowing for cable voltage losses Output Current in e mn 20 0 mA 4 0 mA nein a tacos 1 mA ia 4 rr aura PALLA iii Fault 7 Concentration ii in LEL 0 100 120 Please note Detectors can generate ambiguous measurements at high gas concentrations i e the current output for a gt 20 concentration of gas by volume is the same as for a concentration of lt 5 by volume bell curve It is therefore essential that the measuring device memorises the fact that the value has exceeded the scale and that resetting is manual rather than automatic and follows the safety regulations specific to the site 21 8 2 1 2 Metrological data Type vai Maximum concentration 100 LEL Principle Catalytic Estimated service life gt 36 months Storage Away from air 10 C lt T lt 35 C 10 lt RH lt 60 Maximum 6 months Continuous temperature range 20 C to 55 C Humidity range 0 RH to 95 RH Pressure range 1 bar 10 Linearity variance methane scale Between 0 and 70 LEL lt 1 LEL Between 70 and 100 LEL lt 7 LEL Measurement reproducibility 2 of the value measured or 1 LEL or 0 05 CH4 Long term drift Zero point in normal Sensitivity operating Methane conditions Propane Butane lt 5 methane LEL per year Typical drift values lt 20 of the value measured per year l
13. f an Acetone detector using 1 butane by volume as the calibrating gas Value to be displayed 1 butane injected x 100 x 0 90 Butane Acetone coefficient 60 LEL 1 5 butane LEL N B LELs vary depending on the source Those values shown here are taken from European Standard EN 50054 Coefficients are accurate to 15 24 8 2 2 Technical Specifications and Special Instructions for Oxygen detectors 8 2 2 1 Transfer curves for OLCT 20 detectors The following curve shows the transmitter output current value as a function of gas concentration Where the user connects the transmitter to a device other than a device manufactured by OLDHAM he must check that the transfer curve is fully compatible with its input characteristics to ensure that the information generated by the transmitter is correctly interpreted Equally the device must supply a suitable power supply voltage allowing for cable voltage losses Output Current in mA 23 2 mA FRERE 7 20 0 mA 4 0 mA A E mnt e 000000000000001 esssssseseszeszeseosioneseoeeneesezezizese Fault Wy O2 concentration by volume 0 30 0 36 0 8 2 2 2 Metrological data 30 O2 Type and number CT5020 CELL Principle 2 electrode electrochemical Measurement of oxygen Storage 4 C lt T lt 12 C 7 Accuracy at 20 C 15 to 21 Oz 0 5 vol O T90 response time Effect of temperature 0 to 40 C lt 0 5 vol O Effect of humidity 10 to 90 RH T
14. he measurement is lower as a result of the air being diluted by water vapour Sensitivity drift over time lt 2 per month Zero stabilisation time following 30 to 60 minutes power up 25 8 2 2 3 Characteristics and Special precautions for oxygen detectors e When the transmitter is powered up or the measurement sensor is replaced it takes between 30 and 60 minutes for the measurement to stabilise at 20 9 v v in pure ambient air e The use of an oxygen rich atmosphere gt 25 can compromise safety 8 3 Markings 8 3 1 Flameproof certified version OLC 20d and OLCT 20 d OLDHAM F 62027 Arras C 0080 OLC 20d or OLCT 20d II 2GD Ex d IIC T6 Gb Ex tb IIC T85 C Db IP66 Tamb 20 C to 70 C INERIS 01ATEX0004X Read instruction manual WARNING Do not open when energized Serial number year of manufacture 8 3 2 Intrinsic safety version OLCT 20 i OLDHAM F 62027 Arras C 0080 OLCT 201 II 1 GD Ex ia IIC T4 Ga Ex ia INC T135 C Da IP66 IMI Ex ia IMa Tamb 20 C to 70 C INERIS 01 ATEX0004X Read instruction manual WARNING Do not open when energized Serial number year of manufacture 26 9 Recommendations The measuring sensor shall be positioned facing downwards The physical location of the TRANSMITTER depends on the type of gas to be detected e at the high point if the gas is lighter than air e at the low point if the gas is heavier than air e near outlet vents in the case of mechanica
15. instrument calibration be performed using a certified concentration s of calibration gas es quarterly every 3 months Calibrations may be necessary more or less frequently based for example on application field conditions exposure to gas sensor technology and environmental conditions The frequency of calibration is best determined by company policy or local regulatory agencies If an instrument fails to operate properly during any functional bump test a full instrument calibration should be performed successfully prior to use These recommendations are based on safe work procedures industry best practises and regulatory standards to ensure worker safety OLDHAM is not responsible for setting safety practices and policies For new installations it may be prudent to carry out bump tests frequently at first perhaps weekly increasing the time intervals to perhaps monthly or more as confidence grows with experience in the installation concerned on the basis of the maintenance record 3 1 1 Calibration On the controller On the detector Set the measuring channel to the calibration position alarm relays inhibited Apply the calibration cup and perform the calibration in accordance with the procedure defined during the training course provided by OLDHAM or by an OLDHAM s authorized person Proceed the zero ig i Set the measuring channel back to the normal position and make sure that it is working pro
16. ion Coefficients Gas Chemical LEL LSE Flash Vapor Coefficient Coefficient Coefficient Coefficient Formula ee ously ra ee ee Ge Pentane Ethyl acetate C4H802 2 10 1150 4 3 0 1 65 1 35 0 90 0 80 Acetone C3H6O 2 15 1300 18 21 1 65 1 35 0 90 0 80 Acetylene C2H2 1 50 100 18 09 2 35 1 90 1 25 1 15 Acrylic acid C3H402 2 40 800 54 25 5 00 4 00 2 65 2 40 Butyl acrylate C7H1202 1 20 800 37 44 3 50 2 80 1 85 1 70 Ethyl acrylate C5H802 1 70 1300 2 35 3 05 2 45 1 65 1 50 Acrylonitrile C3H3N 2 80 28 00 1 1 8 1 45 1 20 0 80 0 70 Ammoniac NH3 15 00 3020 lt 100 06 0 90 0 75 0 50 0 45 Benzene C6H6 1 20 8 00 11 27 4 00 3 20 2 15 1 90 RE C4H6 1 40 1630 85 1 9 2 55 2 05 1 35 1 25 Butane CAHIO 150 850 60 20 19 15 4100 o9 en C4H100 14 113 29 26 1 95 1 60 1 05 0 95 C CAHBO 180 11 50 4 25 390 3 15 2 10 1 90 Cyclohexane C6H12 1 20 830 17 2 9 2 00 1 60 1 10 1 00 Dimethylether C2H60 300 27 00 4 1 6 1 80 1 45 0 95 0 90 Dodecane C12H26 0 60 60 74 5 9 4 00 3 20 2 15 1 90 Ethane C2H6 3 00 1550 15 10 1 50 1 20 0 80 0 75 Ethanol C2H60 3 30 1900 13 16 2 15 1 75 1 15 1 05 Dinan C2H5 20 1 70 3600 45 26 1 90 1 55 1 00 0 90 Ethylene C2H4 270 3400 135 10 1 65 1 35 0 90 0 80 LPG Prop But 1 65 90 lt 50 19 1 90 1 55 1 00 0 90 Diesel Melange 0 60 60 55 gt 4 3 20 2 60 1 70 1 55 Natural Gas CH4 5 00 15 00 18 06 1 05 Heptane C7H16 1 10 670 4 35 2 20 1 80 1 20 1 05 Chemical Vapor Coefficient Coefficient Coefficient Coefficient i Calibrationgas Calibrationga
17. l ventilation e or more generally in locations where the gas is likely to accumulate Despite its high degree of protection IP66 it may be necessary to protect the TRANSMITTER against adverse weather conditions rain dust direct sunlight etc and from direct spraying with cleaning or maintenance products causing soiling of the detection sensor The TRANSMITTER must also be positioned so as to allow access to the measuring sensor so that it can be replaced Detectors must be positioned so as to optimize the detection of accumulations of gas emitted in the air Factors to be considered in determining optimal detector positioning gt potential sources of gas and vapour emissions gt chemical and physical data on gases and vapours which may be present gt liquids with low volatility gt detectors as near as possible to the leak risk area gt type and concentration of gas leaks high pressure jet slow leak etc gt air movements indoors natural and mechanical ventilation outdoors wind speed and direction gt effect of temperature gt installation so as to avoid mechanical damage or deterioration caused by water in summer gt positioning to allow easy maintenance if possible gt avoiding direct sunlight on the readout area as this would lead to maintenance problems 27 28 10 EC Declaration of Conformity DECLARATION DE CONFORMITE CONSTRUCTEUR Manufacturer Declaration of Conformity ne OLDHAM L
18. mines Category MI The ambient operating temperature range is 20 C to 70 C Users should clean detectors regularly in order to prevent any external accumulation of dust The person responsible for IS installation the System Designer must draw up a system document demonstrating that every aspect of the Power Cable Detector system complies with intrinsic safety They must be powered by an intrinsic safety source 28V 300 ohms Where connections are located in a classified zone they will be enclosed in approved envelopes The safety parameters applying to the OLCT 201 detectors are Ci nF 28 94 658 40 15uH 19 8 2 Metrological specifications for explosive gas and oxygen measurement detectors In case of exposure above the measuring range it is mandatory to bump test the instrument with gas and or to perform a calibration In the event of a change of position it is necessary to re calibrate the detector The OLC OLCT 20 transmitter sensors intended to measure explosive gasses and oxygen are classified as safety devices and may therefore contribute to limiting the risk of explosion Detectors comply with the following European standards Explosive gas detectors OLC 20 explosive gas detectors comply with European standards EN 50054 and EN 50057 for Methane calibration gas Propane and Hydrogen gasses following response curves where they are used with the following OLDHAM controllers
19. perly 3 1 2 Replacing a sensor on an OLC 20 When How When the sensor is damaged or cannot be calibrated On a preventive basis Turn off the relevant measuring channel Remove the sensor to be replaced Replace it with a new sensor Turn on the channel back and check that 1t operates correctly see the following page for more information 3 2 Transmitters OLCT 20 OLCT 20 gas transmitters are equipped with a pre calibrated sensor and do not require any adjustment on installation However as gas detectors are safety equipment it is recommended to bump test the complete transmitter after a sensor replacement 3 2 1 Calibration After removing the sensor from the transmitter perform the calibration by using the calibrating bench provided for that purpose see CALIBRO s user manual 10 Procedure On the controller On the detector Set the measuring channel to the calibration position alarm relays inhibited Set the measuring channel back to the normal position and make sure that it is working properly Loosen the locking screw Rotate the sensor module then extract it gt Once calibrated put the sensor back in place or use a replacement sensor and reinstall the whole assembly 11 3 2 2 Calibration specifications Calibration shall be performed outside classified areas and by using suitable equipment that is describe
20. ppm 0 1000 ppm 0 100 ppm 0 300 ppm 0 1000 ppm 0 10 ppm 0 30 ppm 0 10 ppm 0 30 ppm 0 100 ppm 0 2000 ppm 0 100 ppm 0 1000 ppm 0 30 ppm 0 100 ppm 0 30 ppm 0 100 ppm 0 10 ppm 0 1 ppm 0 1 ppm 0 1 ppm 0 10 ppm 0 3 ppm 0 30 ppm 0 50 ppm 0 30 vol 0 1 ppm 6313711 6313712 6313713 6313716 6313717 6313718 6313719 6313720 6313721 6313722 6313723 6313724 6313725 6313726 6313727 6313728 6313729 6313730 6313731 6313732 6313733 6313734 6313735 6313736 6313737 6313738 6313739 6313740 6313746 6313747 6313748 14 5 Accessories TOOL KIT 6147869 CALIBRATION CUP 6331141 BY PASS ADAPTOR for combustible gases CO H2S O 6327310 PLASH GUARD 6329004 PROTECTIVE FILTER PTFE 6335975 ACTIVE CARBON FILTER 6335976 REMOTE CALIBRATION CUP 6327911 for combustible gases only 15 16 6 Technical characteristics of OLC 20 Power supply Power consumption Measurement signal Line length shielded cable Output signal Ingress Protection Weight Dimensions voltage on detector terminals 2 8 V max 3 wire version 400 mA max Wheatstone bridge 3 wire version 1 km as 3x 1 5 mm 32 ohms in loop mode mV bridge output 3 wires IP66 800 g 60 X 120 mm 7 Technical characteristics of OLCT 20 A B Explosion proof version
21. s Calibration gas Formula density CH4 methane H2 Hydrogen C4H10 Butane C5H12 Pentane Hexane C6H14 120 740 23 30 2 10 1 70 1 15 1 00 Hydrogen H2 4 00 75 60 0 069 1 00 Isobutane C4H10 1 50 840 83 2 0 1 50 1 20 0 80 0 75 Isobutene C4H8 1 60 1000 lt 10 19 2 20 1 80 1 20 1 05 Isopropanoli C3H80 215 1350 117 21 1 60 1 30 0 85 0 80 Kerosene C10 ae Ae 0 70 500 gt 50 4 5 00 4 00 2 65 2 40 Methyl C5H802 210 1250 2 3 5 2 25 1 80 1 20 1 10 Methacrylate i i 7 i i i Methane CH4 5 00 1500 188 0 55 1 00 Methanol CH3OH 550 44 00 11 11 1 40 1 15 0 75 0 70 melange Naphta Meg Se 590 gt 44 gt 4 3 50 2 80 1 85 1 70 Nonane C9H20 0 70 5 60 31 44 4 40 3 55 2 35 2 10 Octane C8H18 1 00 6 00 12 39 2 70 2 20 145 1 30 Ethylene oi C2H4O 2 60 100 20 15 2 10 1 70 1 15 1 00 Propylene C3H60 1 9 37 00 70 20 2 35 1 90 1 25 1 15 oxide Pentane C5H12 1 40 800 49 25 1 00 Propane C3H8 2 00 95 10 16 1 55 125 0 85 0 75 Propylene C3H6 2 00 1170 1078 15 1 65 1 35 0 90 0 80 Styrene C8H8 11 8 00 31 36 6 30 5 05 3 35 3 00 FER 110 60 21 3 4 1 80 1 45 0 95 0 90 Toluene C7H8 1 20 7 5 3 1 4 00 3 20 215 1 90 palio 0 8 6 0 35 4 7 3 50 2 80 1 85 1 70 mel C6H15N 1 20 8 15 35 2 05 1 65 1 10 1 00 amine 3 i 3 Li 4 ts melange White Spirit fe 1 10 650 gt 30 gt 4 3 50 2 80 1 85 1 70 Xylene C8H10 1 00 7 60 25 37 4 00 3 20 215 1 90 Sensors with a grey background gases recommended for calibrating the detector VQ1 Example second row of table calibration o
22. t 10 of the value measured per year Effect of humidity 10 to 90 RH at 40 C 5 of relative sensitivity Maximum recommended interval between calibrations normal operating conditions 6 months Calibration concentration 30 80 LEL Response time may vary 10 between sensors gas and concentration injected Methane 50 LEL Hydrogen 50 LEL Pentane 52 LEL Styrene 45 LEL t25 4 sec 3 sec 8 sec 12 sec t50 8 sec 6 sec 12 sec 40 sec t90 15 sec 22 10 sec 27 sec 60 sec 8 2 1 3 Special precautions for explosive gas detectors e Sensors are sensitive to certain poisons which can reduce their sensitivity emission of silicone containing vapours at concentrations gt 10 ppm and chlorinated or sulphurous products at concentrations gt 100 ppm e A lack of oxygen lt 15 Oz or over oxygenation gt 23 O2 may cause under measurement in the former case or over measurement in the latter case e Sensors must be located head downwards at installation or during maintenance work 8 2 1 4 Response to other explosive gasses It is recommended that the detector is calibrated using the gas to be measured Users wishing to calibrate the detector using a gas other that detected and factory programmed should refer to the following table and use the recommended gas and corresponding coefficient Table 1 Calibrat
23. tector Flameproof replacement sensors Part number Replacement sensor VQ1 standard 6313757 Replacement sensor AP poison resistant 6313758 Catharometric sensor 6313759 4 2 OLCT 20 flameproof gas detector Flameproof replacement sensors Part number OLCT 20 0 100 LEL VQ1 6313685 OLCT 20 0 100 LEL AP 6313974 OLCT 20 0 100 vol catharometer 6313687 OLCT 20 CO 0 100 ppm 6313690 OLCT 20 CO 0 300 ppm 6313691 OLCT 20 CO 0 1000 ppm 6313692 OLCT 20 H2S 0 30 ppm 6313695 OLCT 20 H2S 0 100 ppm 6313696 OLCT 20 H2S 0 1000 ppm 6313697 OLCT 20 NO 0 100 ppm 6313698 OLCT 20 NO 0 300 ppm 6313699 OLCT 20 NO 0 1000 ppm 6313700 OLCT 20 H2 0 2000 ppm 6313706 OLCT 20 NH3 0 100 ppm 6313707 OLCT 20 NH3 0 1000 ppm 6313708 OLCT 20 02 0 0 30 vol 6313710 13 4 3 OLCT 20 Intrinsic Safety detector INTRINSIC SAFETY SENSORS SI Part number OLCT 20 CO OLCT 20 CO OLCT 20 CO OLCT 20 H2S OLCT 20 H2S OLCT 20 H2S OLCT 20 NO OLCT 20 NO OLCT 20 NO OLCT 20 NO2 OLCT 20 NO2 OLCT 20 SO2 OLCT 20 SO2 OLCT 20 SO2 OLCT 20 H2 OLCT 20 NH3 OLCT 20 NH3 OLCT 20 HCl OLCT 20 HCl OLCT 20 HCN OLCT 20 HCN OLCT 20 C12 OLCT 20 O3 OLCT 20 COCI2 OLCT 20 PH3 OLCT 20 AsH3 OLCT 20 HF OLCT 20 C102 OLCT 20 ETO OLCT 20 SiH4 OLCT 20 02 0 100 ppm 0 300 ppm 0 1000 ppm 0 30 ppm 0 100
24. ve ATEX 94 9 EC 2 1 3 Wire version OLC 20d OLCT 20d Figure 2 A B C D E OLDHAM controller OLC or OLCT 20 Grounding Power supply Signal I 2 2 2 wire versions OLCT 20d Figure 3 A B C D E OLDHAM controller OLC 20 or OLCT 20 Grounding Power supply Power supply Signal 2 3 2 wire Intrinsic Safety versions OLCT 20i Hazardous area Safe area Figure 4 A B C OLDHAM controller OLC 20 or OLCT 20 ZENER Barrier 3 Maintenance The operations and adjustments described in this chapter must be performed N by authorized personnel only as they can affect the appliance s reliability in detection It is prohibited to open the transmitter when energized 3 1 Detector OLC 20 Gas detection instruments are potential life saving devices Recognizing this fact OLDHAM Corporation recommends that a functional bump test be performed on every fixed gas monitoring instruments as part of a regular maintenance program A functional test is defined as a brief exposure of the detector to a concentration of gas es in excess of the lowest alarm set point for each sensor for the purpose of verifying sensor and alarm operation and is not intended to be a measure of the accuracy of the instrument OLDHAM further recommends that a full
25. where the equipment is installed Please refer to the provisions of European Directive ATEX 1999 92 EC on improving health and safety conditions for workers exposed to potentially explosive atmospheres 8 1 Specifications for mechanical and electrical installation in Classified Areas Installation will comply with all applicable standards and particularly with EN 60079 14 and EN 60079 17 8 1 1 Flameproof detectors d These detectors are intended for use in surface industries II Category 2 zones 1 and 2 Gas and zones 21 and 22 Dust in ambient temperature from 20 C to 70 C Cables will be mechanically protected The transmitter casing will be earthed using the external or internal terminal which should be corrosion protected Users should clean detectors regularly in order to prevent any external accumulation of dust Mechanically detectors will be installed such that the detection sensor points downwards Any variance of over 45 from the vertical will result in measurement errors Where connections are located in a classified zone they will be enclosed in approved envelopes The width of the threaded joint of cable gland is superior to the value specified in the table of EN 60079 1 standard 8 1 2 Intrinsic safety detectors i OLCT 20 i These detectors are intended for use in surface industries Il Category 1 zones 0 1 and 2 Gas and zones 20 21 and 22 Dust They are also intended for use in coal
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