Download - Training Presentation - Elcometer 266
-
8/10/2019 Training Presentation - Elcometer 266
1/17
Elcometer 266
Digital Holiday Detector
-
8/10/2019 Training Presentation - Elcometer 266
2/17
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
-
8/10/2019 Training Presentation - Elcometer 266
3/17
What is Holiday?
Holiday is a generic term used for any Defectin a coating
Types of holidays: Pinholes
Voids
Discontinuities
Overcoating
Undercoating
Porosity
-
8/10/2019 Training Presentation - Elcometer 266
4/17
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
-
8/10/2019 Training Presentation - Elcometer 266
5/17
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
-
8/10/2019 Training Presentation - Elcometer 266
6/17
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
-
8/10/2019 Training Presentation - Elcometer 266
7/17
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
-
8/10/2019 Training Presentation - Elcometer 266
8/17
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
-
8/10/2019 Training Presentation - Elcometer 266
9/17
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
-
8/10/2019 Training Presentation - Elcometer 266
10/17
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)
-
8/10/2019 Training Presentation - Elcometer 266
11/17
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
-
8/10/2019 Training Presentation - Elcometer 266
12/17
Probe Selection
Band Brush Circular BrushRubber Brush Rolling SpringWire Brush
-
8/10/2019 Training Presentation - Elcometer 266
13/17
Reference Standards & Test Methods
-
8/10/2019 Training Presentation - Elcometer 266
14/17
-
8/10/2019 Training Presentation - Elcometer 266
15/17
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
-
8/10/2019 Training Presentation - Elcometer 266
16/17
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
-
8/10/2019 Training Presentation - Elcometer 266
17/17
Thank You ll