training presentation - elcometer 266

8/10/2019 Training Presentation - Elcometer 266

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Elcometer 266

Digital Holiday Detector


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Training Agenda

What is a Holiday?

Types of Holiday Detectors

Elcometer 266a digital system

Technical Specifications

Safety & Application Features

Standard Holiday Detection Procedure

Probe Selection

Reference Standards & Test Methods

Setting-up Probe Voltage & Current

Dos & Do-Nots

Practical Demonstration


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What is Holiday?

Holiday is a generic term used for any Defectin a coating

Types of holidays: Pinholes

Voids

Discontinuities

Overcoating

Undercoating

Porosity


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Types of Holiday Detectors

1. UV Pinhole Detector:

A base coat containing a UV fluorescing additive is applied on the coated

surface, when the UV flashlight shines on the coating, defective areas fluoresce,

showing the location of the pinhole

Used as a low cost, quick method of detecting pinholes in coatings

2. Wet Sponge Detector: A low voltage is applied to a sponge, moistened with a wetting agent (water),

when the sponge moves over a coating flaw, liquid penetrates into the defect and

completes an electrical circuit with metallic substrate, setting off the alarm

Used for coatings having thickness less than 500m (20 mils) like powder

coatings & thin polymeric coatings, Low voltage does not damage the coating

3. High Voltage Detector: A power supply generates a high DC voltage which is connected to a suitable

probe with an earth return connected to the substrate. As the probe is passed

over the coated substrate, a flaw is indicated by a spark at the contact point

which sets off the alarm

Used for coatings having thickness up to 7.5mm (300 mils), ideal for pipelines

coatings & concrete coatings

High Voltage detector is also known as a Spark tester or a Jeep tester


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Power Handle

Control Unit / External Battery

Earth Cable / Connection Cable

Extended / Safety Handle

External Pipe Rolling Springs

Misc. Electrodes / Wire Brushes

Elcometer 266 a digital system


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o Output voltage: 0.5 kV to 30 kV

o High voltage output accuracy: 5% or 50 V below 1 kV

o Measured current flow accuracy (sensitivity): 5% of full scale

o Display resolution:

Measured voltage : 0.01 kV below 10 kV, 0.1 kV above 10 kV

Set voltage: 0.05 kV below 1 kV, 0.1 kV above 1 kV

Measured current: 1 A

Set current: 1 A

o Output current: 99 A maximum

o Operating temperature: 0C to 50C (32F to 120F)

o Power supply: Internal rechargeable lithium ion battery

o Battery life (typical): 8/10 hours continuous use with/without backlight

o High voltage handle cable length (curly cable): 1.5 m (5) when stretched

o Earth signal return cable length: 10 m (32' 6")

o Weight: 2 kg (instrument, handle and connecting cable)

Technical Specifications


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Safety Features

2 Stage Safety Switch: With safety interlock, voltage handle will automatically switch off if

it is not gripped or in case it dropped accidentally from hand

Extended Ribbing & Safety Handle: Provides extra protection to the operator against electrical shock

and two hands gripping for convenience


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Safety Features

Voltage Indication: Digital display of applied voltage on control unit

Speaker on the control unit clearly emits a ticking noise to

indicate that there is voltage applied at the voltage handle

Loud Audible Alarm: Loud audible alarm is activated when a spark is detected.

Beep volume can also be adjusted to ensure it can be heard

even in noisy environments

3000 Volt


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Application Features

Adjustable Voltage & Current Settings: Voltage adjustment via keypad on the control unit, no need for

screwdrivers

Current sensitivity can be manually preset or automatically

adjusted by the instrument

Integrated Voltage Calculator: No need to use any calculator or formula to determine the voltage

as control unit software has an integrated voltage calculator

Enter the test standard and the coating thickness and the

instrument will automatically program the correct voltage for

inspection

Calculated voltage can be locked for next inspections


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Application Features

Integrated Jeep Tester: Internal calibrated Jeep Tester and closed loop system

ensures that the generated test voltage is accurately

measured and continuously controlled, regardless of

climatic conditions

Dual Indication of Holidays: Bright LEDs on the voltage handle, as well as a loud

audible alarm on the control unit, clearly indicate if the

instrument is On (Red) and when a spark is Detected

(Blue)


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Standard Holiday Detection Procedure

1. Making the proper electrical connections among test piece, control unit,voltage handle & probe / electrode

2. Setting the desired values of voltage & current from control unit

3. Holding the high voltage handle firmly, ensuring that your fingers grasp andsqueeze the black rubber grip on the underside of the handle

4. Pressing and releasing the power button on the handle to switch on the highvoltage. The red light on the handle will illuminate and the instrument willemit a regular clicking, indicating that the probe is in operation & at high

voltage5. Placing the probe on the test surface, keeping the probe in continuouscontact with the surface, gaps between the probe and the coating can resultin genuine flaws not being detected

6. Moving it over the work area (plate, pipe) at a speed of approximately onemeter every four seconds, 0.25 m/s (10"/s)

7. Indicating any holidays in the coating by one or more of the following:

a) A spark is seen between the probe and the surface

b) The blue light on the high voltage handle flashes

c) The alarm soundsd) The alarm icon is shown on the display

e) The display backlight flashes

8. Checking the flaws visually and marking them with permanent marker forrepairing

9. Switching off the detector and disconnecting the cables when testing isfinished and when leaving work unattended

10. Storing the instrument properly in its carrying case, always avoid operation& storage of instrument above 50C


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Probe Selection

Band Brush Circular BrushRubber Brush Rolling SpringWire Brush


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Reference Standards & Test Methods


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Setting-up Probe Voltage & Current

SETTING THE CURRENT (SENSITIVITY) - AUTOMATIC

Auto mode is recommended when testing conductive coatings

SENS > UNLOCK > AUTO > OK

SETTING THE CURRENT (SENSITIVITY) - MAUNAL

Manual adjustment may be required when testing partially conductive coatings at high voltages& to comply some test standards

Set current value is adjustable between 5 A and 99 A in 1 A steps As value increases, instrument becomes LESS sensitive

As value decreases, instrument becomes MORE sensitive

SENS > UNLOCK > A > OK


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Important Dos & Do-Nots

DO NOT use the equipment in any combustible, flammable or hazardous area where anarc / spark may result in an explosion (classified area)

DO NOT carry out tests close to moving machinery

DO NOT use the instrument in rain or a damp atmosphere

DO NOT touch probe while it is in operation, this may cause an electrical shock

DO read and understand work instructions before using the equipment DO charge the battery before the first use of the equipment

DO work with an assistant to keep the test area clear and to help in testing procedure

DO check that there are no solvents or other ignitable materials on materials

DO ensure that the earth signal return cable is connected to the conducting substrate

before switching on the instrument

DO only use on coatings that are cured, thickness tested and visually inspected and

accepted

DO only use on coatings having a thickness of at least 200 m (0.008"). For thicknesses

between 200 m and 500 m (0.008 to 0.020), ensure that an appropriately low voltage

is applied (to prevent damage to the coating), or use the wet sponge method (Elcometer

270)

DO bond the work piece to a ground potential to minimize the potential for build up of

static charge

DO switch the instrument off and disconnect the leads when the work is finished


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Thank You ll

training presentation - elcometer 266

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