A test voltage is applied to the coating by moving a brush probe across the surface and where there is either a pinhole or flaw the voltage will spark through the coating at the flawed location a red flashing indicator will flash and an audible alarm will sound the detected flaw can now be marked for subsequent repair and testing resumed for the remaining surface area, if no flaws are detected the test will therefore be non-destructive.
The value of the test voltage is achieved by the dielectric or voltage strength of the coating thickness. Therefore 1000 micron would by approx 3kv to 5kv test voltage. The Instrument can be used as per AS 3894.1, ASTM D 4787, ASTM G 6, ASTM D 5162, BS 1344-11, ISO 2746, NACE RP0274, NACE RP0490, NACE RP0188-88 standards.
Calibration certificates are available with traceability to NIST / accrediated labs in India
Accurate voltage setting is achieved by adjusting a knob to desire voltage is displayed on a digital display with accuracy of ± 1% or in the step of 2KV.
Automatic fault detection feature installed which ensures that are detected at any voltage setting. The Instrument has low voltage battery indication for safeguard the batteries and ensures desired voltage all the time.
The holiday detector is lightweight and overall weight with handle is approx 1.6 kg the test voltage is of low power and does not damage or cause burn marks on the coating.
When the using holiday detector, there are a number of important safety features
in-build to test voltage with high impedance and drops to zero when a fault is detected, earth cable is lockable to prevent accidental disconnection. There is a probe discharge path incorporated to prevent any static charge being maintained will allow coatings on concrete as well as steel and iron substrates to be tested.
In view of the many different holiday testing applications there is an extensive range of accessories available including circular brushes for pipe work internal, rolling springs for pipe work externals, broad brushes to allow for quicker measurement of large surface areas and insulated extension rods.
The holiday detector is supplied in a carrying case complete with high voltage prone handle, conductive rubber brush, neck strap, earth cable and batteries fitted are now available in India.
Other special size circular brushes and external rolling
spring electrodes are supplied as per requirements.
Caltech india also supply High Voltage Measuring Device generally called as Jeep Meter, PRM Meter to verify voltage of holiday detectors.