Elcometer 136 Operating Instructions Manual
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Elcometer 136 Operating Instructions Manual

Elcometer 136 Operating Instructions Manual

Dc portable holiday detector
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Operating Instructions
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Elcometer 136
DC Portable Holiday Detector

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Summary of Contents for Elcometer 136

  • Page 1 Operating Instructions for the Elcometer 136 DC Portable Holiday Detector...
  • Page 2 30,000 volts. The equipment should be used with extreme care, following the instructions given in this Manual. All CE marked Elcometer 136 Holiday Detectors meet the emc directive 89/336/EEC, amended 92/31/EEC & 93/98/EEC. However, due to its method of operation, the Detector will generate broadband RF emissions when a spark is produced at the probe, i.e.

  • Page 3: Table Of Contents

    CONTENTS SAFETY GUIDE Do Not INTRODUCTION EQUIPMENT IDENTIFICATION Control Panel Connections and Terminals DETAILED OPERATION Test Batteries Connect Leads Select Probe Earth to Substrate Check the Earth Connection Set the Test Voltage Set Alarm Sensitivity Detecting Holidays and Other Coating Flaws 7 Moving Work Position and Finishing Work 4.10 Static Electricity...
  • Page 4 TROUBLESHOOTING LCD Display Related Problems Alarm Related Problems Special Considerations 7.3.1 Conductive Coatings 7.3.2 Concrete Substrates MAINTENANCE Battery Maintenance 8.1.1 Charging the Battery 8.1.2 Replacing the Battery 8.1.3 Deep Discharged Battery Lengthening the Earth Lead Routine Checks PROBE, SPARES AND ACCESSORIES GUIDE Right Angle Probes 9.1.1...
  • Page 5 Figure 1 Summary of Operation Read Safety Guide (1.0) Test Batteries (4.1) Replace or Batteries Recharge Batteries (8.0) Connect Leads (4.2) Select Probe (4.3) Earth to Substrate (4.4) Check Earth (4.5) Earth Set Test Voltage (4.6) Set Alarm Sensitivity (4.7) Operation Inspect Coating for Flaws (4.8) End Work...

  • Page 6: Safety Guide

    1.0 SAFETY GUIDE. Due to the method of testing for coating flaws, this equipment outputs a voltage of up to 30kV, i.e. 30,000 volts, on the high voltage probe. Therefore, if the User touches the probe, they may receive a mild electric shock. However, due to the current being very low, this is not normally dangerous.
  • Page 7 DO only use on coating thicknesses of at least 200 microns (0.008"). For thinner coatings, use the wet sponge method with the Elcometer 204 and 269. Use with care for thicknesses between 200 and 500 microns (0.008 to 0.020"). DO be aware of static build-up on the work surface. To reduce the risk of static shock, wear rubber gloves and take special care when leaving confined areas.

  • Page 8: Introduction

    The coating should be at least 200 microns (0.008") and preferably over 500 microns (0.020") thick. The Elcometer 136 is earthed to the substrate and passes a high DC voltage through a probe to the coating surface. When the probe passes over a coating flaw the electrical circuit is completed.

  • Page 9: Connections And Terminals

    3.2 Connections and Terminals. À Á 1.6 A Â Ã Ä Figure 3 - Side Connections and Terminals Layout 1. High voltage probe connection 2. Fuse and fuse holder (1.6A T-type fuse, supplied separately) 3. Earth lead terminal 4. Nut securing battery pack 5.

  • Page 10: Detailed Operation

    See Figure 1 for Summary of Operation. If using the Elcometer 136 in the carry case, pass the earth lead through the loop on the side of the case. This reduces the possibility of the earth lead becoming detached.

  • Page 11: Select Probe

    4.3 Select Probe. Select the correct probe and attach it to the high voltage probe. Type of Surface Recommended Notes Probe Small area, complex Band brush probe P r o v i d e s l ow c on tac t s u r f a c e , g e n e r a l pressure applications...

  • Page 12: Set The Test Voltage

    Press [OFF/Test] to switch the instrument off. Turn ‘Voltage’ and ‘Sensitivity’ fully anti-clockwise. 4.6 Set the Test Voltage. Holding the probe in free air press ‘ON’ to turn the detector Turn ‘Voltage’ clockwise until the required test voltage is indicated on the LCD display. See Section 5.0 for background information on the Test Voltage.

  • Page 13: Static Electricity

    4.10 Static Electricity during Testing. As the probe is moved over the surface of a coating, a static charge builds up which can: - cause objects in contact with the surface to become charged with the same polarity - induce an opposite charge on nearby objects electrically insulated from the surface.

  • Page 14: Test Voltage & Sensitivity

    5.0 TEST VOLTAGE AND SENSITIVITY. For effective testing, the output voltage must lie between lower and upper limits. The lower voltage limit us the voltage required to break down the thickness of air equivalent to the coating thickness. See Section 5.2.1. The upper voltage limit is the point at which the coating would break down.

  • Page 15: Determining The Voltage Limits

    Figure 5 Breakdown Voltage Against Thickness for Materials of Different Dielectric Strengths 5.2 Determining the Voltage Limits. 5.2.1 The Lower Limit. The lower voltage limit for effective operation is the dielectric strength of air (1.3 to 4kV/mm) multiplied by the thickness. If the coating thickness can be determined, read the lower limit value from Figure 5, using the line marked AIR.

  • Page 16: The Upper Limit

    Turn ‘Voltage’ up slowly and steadily until a spark is produced. Note the voltage. This voltage forms the lower limit. 5.2.2 The Upper Limit. The upper voltage limit is the dielectric strength of the material multiplied by its thickness. The following are methods for determining the upper voltage limit.
  • Page 17 Table 2 - kV Values from ASTM G62-87 microns kilovolts thou kilovolts 1.04 1.17 1.47 1.66 1.80 2.03 2.08 2.34 2.33 2.63 2.55 2.88 2.76 3.11 2.95 3.32 3.12 1000 3.29 Table 3 - kV Values from ASTM G62-87 kilovolts thou kilovolts 7.84...

  • Page 18: Probe Selection

    Extension pieces and connectors are also available if a long reach is required. See Section 9.0. Use only fittings supplied by Elcometer Instruments Ltd. 7.0 TROUBLESHOOTING. 7.1 LCD Display Related Problems. LCD Display Does Not Function...

  • Page 19: Alarm Related Problems

    Displayed Voltage is Higher than that at Probe Tip Possible Reason Solution Damaged high voltage lead Replace lead Missing/ broken neon indicator Replace neon indicator Poor earth connection Check connections. See Section 4.5 7.2 Alarm Related Problems. Alarm Sounds Continuously Possible Reason Solution Conductive coating...

  • Page 20: Special Considerations

    7.3 Special Considerations. 7.3.1 Conductive Coatings. If the displayed voltage drops sharply when the probe is placed on the test surface, or if the alarm sounds continuously, then the coating may be conductive. The usual reasons for this are detailed below. Existence of metallic, carbon or other conducting particles in the coating.

  • Page 21: Concrete Substrates

    Coating may not be fully cured. In this case the coating still contains solvents which allow the path to earth to be formed even if a flaw is not present. To overcome this problem, allow the coating to cure before undertaking the test.

  • Page 22: Maintenance

    8.0 MAINTENANCE. 8.1 Battery Maintenance. The Elcometer 136 battery should be stored charged. Due to the gel and sealed casing, the battery does not require topping up with water. The battery life is normally 8 hours. Recharging time for the battery is 10 hours.

  • Page 23: Deep Discharged Battery

    8.3 Routine Checks. Regularly check, and replace if necessary, the detector, probe, earth leads and connectors for damage. If service or annual renewal of the Calibration Certificate is required, return your Elcometer 136 to your local Distributor or to Elcometer Instruments Ltd.

  • Page 24: Probe, Spares And Accessories Guide

    9.0 PROBES, SPARES AND ACCESSORIES GUIDE. (See also Section 4.3) 9.1 Right Angle Probes. Right angle probes are most suitable for large, relatively flat, surface areas. They are available in 3 widths and include a probe holder and a 100mm adaptor as standard. The adaptor on this probe cannot be replaced by an extension piece.

  • Page 25: Circular Brush Probes

    9.2 Circular Brush Probes. Circular brush probes are used to test internal pipe surfaces. They are available in 12 sizes and include an adaptor and a 250mm extension piece as standard. Pipe Diameter Fig. Assy. Part Spare Brush Note mm (ins) Numbers Part Numbers 38(1.5)

  • Page 26: Rolling Spring Probes

    9.3 Rolling Spring Probes. Rolling spring probes are used to test external pipe surfaces. They are available in 14 nominal diameters and include a holder and a 250mm extension piece as standard. Part Numbers Pipe Diameter Assembly Spring Only mm(ins) 50(2.0) T1362649A T1366197A...

  • Page 27: Extension Pieces

    Note: For larger diameters use a right angle brush probe. 9.4 Extension Pieces. Extension pieces allow the reach of all probes to be increased. Each one requires a coupling piece. COUPLING Length Part Number 250mm T1362663A 500mm T1362663B 1000mm T1362663C Coupling T1362666- 9.5 Spares Numbers.

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