Fischer Poroscope High Voltage Holiday Detector

Fischer Poroscope High Voltage Holiday Detector


To ensure thorough safeguarding against corrosion, the protective layers must be free of pores, cracks and embedded foreign bodies. This prevents aggressive substances from coming into contact with the carrier material. With Fischer’s holiday detectors, you can easily identify cracks in coatings made of electrically non-conductive materials. Three different models are available: Poroscope HV5, Poroscope HV20 and Poroscope HV40. They offer a range of test voltages suitable for almost every coating thickness and every kind of coating material.

The pore testing is carried out by means of a constant DC voltage between 0.8 and 40 kV. Fischer high-voltage pore testers meet all the safety requirements of ISO 2746. In addition, these handheld devices are very robust – ideal for conducting inspections even under harsh conditions. Regardless of how challenging the application, you’re always properly equipped with Fischer holiday detectors. From fine pore inspections on plastic coatings or sterile, air-tight packaging for medicinal or food products right through to checking the plastic or enamel coatings used to protect tanks, ships' hulls or piping against corrosion.


  • Portable pore testers for detecting pores and cracks in surfaces
  • Robust, for use on construction sites or in manufacturing
  • Compliance with safety requirements according to ISO 2746
  • Simple operation thanks to intuitive menu navigation, lighted display and rotary pushbutton
  • Extensive selection of electrodes for every application
  • Continuously adjustable test voltage and detection sensitivity, electronic test voltage monitoring
  • Optical and acoustic pore indication
  • Clear display of the test voltage in the test head
  • Available in three voltage ranges: Poroscope HV5: 0.8–5kV, Poroscope HV20: 4–20kV, Poroscope HV40: 8–40kV


  • Fast and safe pore testing on coated metals
  • Enamel- or plastic-coated tanks for mineral oils, boilers, pipes, hot-water tanks and heat exchangers
  • Corrosion protection coatings on ships' hulls
  • Plastic-coated packaging for foodstuffs and medicines
  • Inspection of electrostatically chargeable objects


Suitable electrodes are available for every application. The desired electrode is simply screwed onto the test head.

  • Sweeper electrodes: Pore testing of large-area enamel, rubber and synthetic coatings.
  • Flat electrode with replaceable rubber tongue: Pore testing of paint coatings.
  • Roller electrode: Pore testing of foils.
  • Circular ring electrodes: Pore testing of exterior pipe walls. The circular ring electrodes swing open for easy placement around a pipe.
  • Rotating electrodes: Pore testing of interior pipe walls. Up to an inside diameter of 125, the rotating electrodes look like bottlebrushes. The brush bristles in the center are made of fine bronze spring wire; the nylon bristles in the front and back help to center the brush in the pipe. Tests on the inside of pipes up to a length of 12 m (47“) are possible using suitable rod systems. Rod pieces coated with synthetic material are combined to the desired lengths. Inserting centering devices prevents sagging of the rod. The rod system together with the inserted centering devices is also used for the voltage supply of the rotating electrode.

Technical Specifications

Poroscope Specifications

Voltage Supply Li-ion battery
Battery Operation 40 kV: approx. 8 h continuous operation
20 kV: approx. 20 h continuous operation
Test Voltage Continuously Adjustable:
HV5: 0.8 – 5 kV, in compliance with standard 1 – 5 kV
HV20: 4 – 20 kV
HV40: 8 – 40 kV
Dimensions Supply Unit: approx. 200 x 125 x 50 mm
Test head max. Ø approx. 120 mm
Test head length:
HV5: approx. 320 mm
HV20: approx. 340 mm
HV40: approx. 380 mm
Weight Supply unit: 1.4 kg
Test head:
HV5: approx. 0.9 kg
HV20: approx: 0.94 kg
HV40: approx. 1 kg
Test Voltage Display OLED graphic display
Test Voltage Display Error < 5 %
Connection for Charger 18 V= / 3 A
Pore Indication Acoustical: alarm signal at test head
Optical: red LED at test head, pore symbol with current pore counter reading on the display of the test head
Pore Detection Sensitivity detection threshold settable to a voltage drop of 10, 20, 30 or 50%, porosity detector switchable between static and dynamic threshold
Test Voltage Monitoring green LED; turns off, if the nominal voltage decreases by more than 5 %
Environmental Conditions 0 – 40 ºC (32 –104 ºF)
0 – 60 % RH, no condensation on test surface
Storage Temperature 0 – 60 ºC (32 – 140 ºF)
Compliance ISO 2746

Kit Includes

  • Measuring Head
  • Supply Unit with Shoulder Strap
  • Rugged Transport Case
  • Connection Cable, length approx. 1.20 – 3 m
  • Ground Cable, length approx. 10 m
  • Battery Charger: Input: 100 – 240 V~, 47 – 63 Hz, 1.6 A - Output: 18 V=, max. 3.3 A

Product Literature

Description Part # Saved Price Select Option Add to
Fischer Poroscope HV5 High Voltage Holiday Detector CT-FT-604-959 Request Pricing
Fischer Poroscope HV20 High Voltage Holiday Detector CT-FT-604-958 Request Pricing
Fischer Poroscope HV40 High Voltage Holiday Detector CT-FT-604-521 Request Pricing