Oldham OLCT 20 User Manual
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Oldham OLCT 20 User Manual

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OLCT 20
User manual
Part Number: NPO20GB
Revision: E.0
The Fixed Gas Detection Experts
1

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  • Page 1 OLCT 20 User manual Part Number: NPO20GB Revision: E.0 The Fixed Gas Detection Experts...
  • Page 2 Copyright April 2018 by Oldham S.A.S All rights reserved. No reproduction of all or part of this document, in any for mis permitted without the written consent of Oldham S.A.S. All information provided in this document is accurate to the best of our knowledge.

  • Page 3: Table Of Contents

    | Maintenance ............11 Maintenance frequency ................. 11 Detector OLC 20 .................... 12 Transmitters OLCT 20 ................... 12 Replacing a sensor on OLCT 20 ..............14 | Spare Parts ............15 Flameproof approved replacement sensors ..........15 Intrinsically-safe approved replacement sensors .......... 16 | Accessories ............
  • Page 4 | EU Declaration of Conformity ......25 | Special instructions for use in explosive atmospheres and fonctional safety.......... 27 General comments ..................27 Warnings ......................27 Requirements for use in dust explosive atmospheres ........27 Cable entries ....................27 Threaded joints ....................28 Limitations of use ...................

  • Page 5: Overview

    Limitation of Liability ■ OLDHAM shall not be held responsible for any damage to the equipment or for any physical injury or death resulting in whole or in part from the inappropriate use or installation of the equipment, non-compliance with any and all instructions, warnings, standards and/or regulations in force.

  • Page 6: Warranty

    • organo-phosphorus compounds (e.g. herbicides, insecticides, and phosphate esters in fireproof hydraulic fluids) Oldham recommends regular testing of fixed gas detection installations (read Destruction of equipment European Union only. This symbol indicates that, in conformity with directive DEEE (2002/96/CE) and in accordance with local regulations, this product must not be discarded with household waste.

  • Page 7: Symbols Used

    Symbols used Icon Signification This symbol indicates : useful additional information. This symbol indicates : This equipment must be connected to ground. This symbol denotes: Protective earth terminal. A cable of the adequate diameter must be connected to ground and to the terminal having this symbol This symbol denotes: Attention! In the present mode of use, failure to adhere to...
  • Page 8 1 – Overwiew...

  • Page 9: Description

    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 20i).

  • Page 10: 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 2014/34/EU. See Appendix 1 for general installation instructions. Figure 1 : Dimensions Dimensions OLC/OLCT 20 Cable length 0.2 m 2 – Description...

  • Page 11: Wiring Arrangements

    Please ensure you read the paragraph: Special Specifications for use in Explosive Atmospheres in Accordance with European Directive ATEX 2014/34/EU. 3-wire version (OLC 20d, OLCT 20d) Figure 2 OLDHAM controller OLC or OLCT 20 Grounding Power supply Signal (I) 2-wire version (OLCT 20d) Figure 3 OLDHAM controller...

  • Page 12: 2-Wire Intrinsic Safety Version (Olct 20I)

    2-wire Intrinsic Safety version (OLCT 20i) Figure 4 OLDHAM controller OLCT 20 Zener Barrier 5 – Maintenance...

  • Page 13: Installation

    | Installation It is recommended that you read the relevant guides for installing, operating and maintaining flammable gas and oxygen detectors (EN 60079-29-2) and toxic detectors (EN 45544-4). Regulations and operating conditions ■ Installation must comply with current edition of EN 60079-14 for systems installed in explosive atmospheres and eventually with any local or national additional requirements that may apply in the country of installation.

  • Page 14: Mounting The Detector

    Mounting the detector The detector must be installed with the detection sensor pointing downwards. For combustible gas detectors, tilting the device more than 45° past vertical can lead to imprecise readings. Despite its high degree of protection (IP66), it may be necessary to protect the detector against adverse weather conditions (rain, dust, direct sunlight, etc.) and from direct spraying with cleaning or maintenance products (causing soiling of the detection sensor).

  • Page 15: Maintenance

    Maintenance frequency Gas detectors are safety devices. Oldham recommends regular testing of fixed gas detection installations. This type of test involves injecting a standard gas of sufficient concentration into the detector to trigger pre-set alarms. This test does not, in any event, replace a full calibration of the detector.

  • Page 16: Detector Olc 20

    Turn on the channel and check that it operates correctly 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.
  • Page 17 Procedure On the detector On the controller Set the measuring channel to the calibration position (alarm relays Loosen the inhibited) locking screw Rotate the sensor module and extract it Once calibrated put the sensor back in place or use a replacement sensor and reinstall the whole assembly.

  • Page 18: Replacing A Sensor On Olct 20

    Calibration specifications Calibration shall be performed outside classified areas and by using suitable equipment that is described during the training course provided by OLDHAM or by a person authorized by OLDHAM. Replacing a sensor on OLCT 20 When? When the sensor is damaged or cannot be calibrated.

  • Page 19: Spare Parts

    | Spare Parts All replacement parts must be Oldham-manufactured parts. The use of non-Oldham parts could jeopardize the instrument's safety. Flameproof approved replacement sensors Part number Description 6 313 757 OLC 20d sensor cell, 0-100% LEL, VQ1 type 6 313 758...

  • Page 20: Intrinsically-Safe Approved Replacement Sensors

    Part number Description 6 313 773 OLCT 20d sensor cell, R12 6 313 774 OLCT 20d sensor cell, R134a 6 313 775 OLCT 20d sensor cell, MOS Intrinsically-safe approved replacement sensors Part number Description 6 313 748 OLCT 20i O sensor cell, 0 - 30% vol.

  • Page 21: Accessories

    | Accessories Accessory Illustration Code Tool kit for maintenance. 6147869 Tool kit Gas injection Inject the calibration gas onto 6331141 the measurement sensor. pipe Plastic Impact on reading: material. Risk of measurement similar to electrostatic measurement in diffusion mode. charges. Wipe Impact on response time: none.
  • Page 22 7 – Accessories...

  • Page 23: Technical Specifications

    | Technical Specifications Common Ingress Protection IP66 Weight 800 g Dimensions 60 X 120 mm Source mode current 4-20 mA Max. current 25 mA Fault current <1 mA OLC 20d Power supply: voltage on detector terminals = 2.8 V max Power consumption: 3-wire version = 400 mA max Measurement signal:...

  • Page 24: Sensors

    Sensors Gas type Measure- Explosion Intrinsically Temp. % RH Accuracy (ppm) Average Resp. time Storage ment range -proof -safe range (°C) service life T50/T90 (s) conditions (ppm) sensor sensor (months) and time Combustible +/-1% LEL  Catalytic 0-100% LEL -20 to +55 0-95 6/15 (CH4) gases (from 0-70% LEL)

  • Page 25: Cross Gas Factors For Combustible Gases

    Measure- Explosion Intrinsically Temp. % RH Accuracy (ppm) Average Resp. time Storage Gas type ment range -proof -safe range (°C) service life T50/T90 (s) conditions (ppm) sensor sensor (months) and time  Freon R410a 1000 -20 to +55 20 - 95 +/- 15% (from 20- 25/90 70% PE) ...
  • Page 26 Poison resistant catalytic sensor, type VQ1 Molecular C4H10 C5H12 formula coef. coef. coef. coef. (% v/v) (% v/v) Ethyl acetate 2.10 11.50 1.65 0.90 0.80 Acetone 2.15 13.00 1.65 0.90 0.80 Acetylene 2.30 2.35 1.90 1.25 1.15 Acrylic acid 2.40 8.00 5.00 2.65...
  • Page 27 Molecular C4H10 C5H12 formula coef. coef. coef. coef. (% v/v) (% v/v) Styrene (vinyl 8.00 6.30 3.35 3.00 benzene) Premium unleaded 1.10 ~6.0 1.80 0.95 0.90 gasoline (95) Toluene 1.20 4.00 2.15 1.90 Turpentine oil 3.50 1.85 1.70 Triethylamine 1.20 2.05 1.10 1.00...
  • Page 28 8 – Technical Specifications...

  • Page 29: Eu Declaration Of Conformity

    | EU Declaration of Conformity 9 – EU Declaration of Conformity...
  • Page 30 9 – EU Declaration of Conformity...

  • Page 31: Special Instructions For Use In Explosive Atmospheres And Fonctional Safety

    General comments OLCT 20 gas detectors comply with the requirements of ATEX 2014/34/UE European Directive relating to explosive Dust and Gas atmospheres. The information given in the following sections should be respected and taken into account by the manager of the site where the equipment is installed. With...

  • Page 32: Threaded Joints

    Threaded joints Threaded joints have different values than those specified in EN60079-1 standard. Oldham does not allow the repair of the threaded joints and shall not be held responsible for any damage to the equipment or for any physical injury or death resulting from any product modification.

  • Page 33: Transfer Curve For Olct20 Gas Detectors

    The curve below gives the transmitter output current as a function of gas concentration. In the event that the user connects the transmitter to a non- Oldham central controller, the user must ensure that the transfer curve is compatible with the equipment's input characteristics to correctly interpret the data coming in from the transmitter.
  • Page 34 WARNING: Do not open when energized. Read user manual (cable entry). OLC 20d HT detector OLDHAM SAS 62027, ARRAS France OLC20d HT CE0080 INERIS 01ATEX0004X II 2 G D Ex db IIC T* Gb Ex tb IIIC T* Db T.Amb : -20°C to T* °C (*) T4 for T up to +110°C, T3 for T...
  • Page 35 OLCT 20i detector (for mine) OLDHAM SAS 62027, ARRAS France OLCT20i CE0080 INERIS 01ATEX0004X I M1 Ex ia I Ma T.Amb : -20°C to 70°C WARNING: Read user manual (cable entry). 10 – Special instructions for use in explosive atmospheres and...
  • Page 36 The Fixed Gas Detection Experts EUROPEAN PLANT AND OFFICES Z.I. Est – rue Orfila CS 20417 – 62027 Arras Cedex FRANCE Tél: +33 (0)3 21 60 80 80 – Fax: +33 (0)3 21 60 80 00 Website: https:/gasdetection.3m.com EUROPE AMERICAS ASIA PACIFIC Tel: +33-321-608-080 Tel: +1-713-559-9280...

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