Holiday Detector Setting & Testing

The term "Holiday" dates back to the days of the great wooden sailing ships. During the long slow voyages, ship maintenance was a must. One of the most important duties was that of the mast sealer. A sailor would seal the mast of the ship with tar to prevent the wood from rotting. If the sailor missed coating an area of the mast the wood would rot. It was said, the sailor must have taken a Holiday at that point thus not achieving a good coat of tar on the mast. Later as steel replaced wood, paint replaced tar. However, holidays live on. Holidays also known as pinholes void discontinuities. Holiday Detector is an instrument used to detect holes in anti-corrosive coating (electrically insulated) on metallic pipes / surfaces. This test is carried before the pipes are laid underground. The pipe is connected to earth (nominal) and an electrode, charged to high tension, is moved over the coating. At the place of a hole, arcing takes place and the instrument gives alarm. The instrument consists of an electronic oscillator to convert small DC Voltage (12 V) to AC. A high voltage rectifier to give high tension DC output. Su. Bhaskar Holiday Detector is a fully solid-state device and has no moving part except the indicator pointer (Digital readout on special demand can be supplied). This has made the device maintenance-free, portable and light-weight.