【Function
and Purpose】
Shengli
SL-68 electrical spark leakage detector is a dedicated device to test the
construction quality together with micropores and air gaps due to aging and
corrosion of coatings on such metal surfaces as oil and gas pipelines, cables,
enamels, metal tanks, and ship hulls.
This
device is developed by introduction of the foreign microelectronic high-voltage
generator and by using the PC-control technology, complying with the national
standard GB7993 and the German standard DZN 51163.
【Characteristics】
1.
The all-in-one microelectronic high-voltage generator is used to avoid static
electricity;
2.
Digital display, to improve output accuracy;
3.
Automatic changeover between high voltage and supply voltage;
4.
Quick and smart charging, full stop, without manual control;
5.
Adoption of the original Japanese microswitch power supply, to improve
performance and reduce weight;
6.
Self-test at start-up;
7.
Equipped with protection systems against static-electricity and high-voltage misinput
to promote reliability of the device;
8.
Specially provided with automatic adjustment function for protection, without
the Achilles’ heel of its counterparts;
9.
Modular structure and “three prevention” design are adopted for the line of the
device, to greatly extend the life time of outdoor operated device and to
improve its reliability.
【Primary
Technical Parameters】
1.
Measuring range: type A: 0.03-3.50mm; type B: 3.50-10.0mm
2.
Output high-voltage: type A: 0.50-15.0KV (epoxy coal pitch); type B:
15.0-36.0KV (petroleum asphalt)
3.
AC supply voltage: 220V±25%
4.
Built-in DC voltage: type 68A: 6V; type 68B: 8.4V
5.
DC power consumption: ＜5W
6.
Time of automatic changeover between AC/DC: ＜0.01 second
7.
Alarm delay: 1-2 seconds
8.
Main frame volume: 228×85×180
9.
Main frame weight: 2.5kg (battery included)
【Detection
Principles and Methodology】
The
resistance and the air gap density are very small at under coating,
metal-exposed, and leakage micropores on the anti-corrosive and insulative
coating of metal pipes, so when the high voltage passes through, the gap
breakdown forms to generate spark discharge, giving out a pulse signal to the
alarm circuit, and the alarm sounds with light. That’s how the spark detector
conducts leakage detection on the anti-corrosive coating.
