InteliSENS® ST-AC Series Spark Tester

InteliSENS® ST2560-AC - front view
InteliSENS® ST2560-AC - rear view
InteliSENS® ST2560-AC - ball chain electrode view
InteliSENS® ST2560-AC - connector panel view



  • 130mm maximum cable diameter.
  • 300mm long bead chain electrode.
  • 25kV maximum test voltage.
  • Distinguishes and separately counts pinhole and bare patch flaws.
  • mains test frequency.
  • UL1581, UL2556 and EN62230-compliant testing
  • Ozone extraction port.

Additional Information:

Dimensional drawings
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InteliSENS® ST-AC Series Spark Tester


Proton Products InteliSENS® ST-AC series mains frequency spark testers meet the international standards stipulated for wire insulation testing UL1581, UL2556 and EC62230.

The Proton Products mains frequency AC Spark Testers are designed for in line testing of cables to detect pinhole and bare patch insulation faults.

they accommodates cables up to 130 mm in diameter and outputs an AC frequency, user-adjustable EHT test voltage of up to 25 kV AC (rms).

Typical applications are for the insulation testing of power and automotive cables

This unit offers a broad selection of built-in and optional industry standard communications interfaces for connection to production controllers.

The InteliSENS® ST-AC Series electronics are housed in a rugged IP54 sealed stainless steel case, ensuring reliability and long operational life.


ST2560-AC Specification25602510025130Units
Max. Wire diameter60100130mm
Electrode length300300300mm
Electrode type5mm bead chain5mm bead chain5mm bead chain
EHT test output voltage252525kV (rms)
EHT test output voltage resolution0.10.10.1kV (rms)
EHT test output voltage accuracy222%
EHT test output capacitive current (at 25 kV)999mA (rms)
EHT test output resistive current (at 25 kV)444mA (rms)
EHT test output continuous short circuit current101010mA (rms)
Power supply voltage85 - 26585 - 26585 - 265VAC (rms)
Power supply frequency47 - 6547 - 6547 - 65Hz
Power consumption400400400W
Operating temperature5 - 455 - 455 - 45°C
41 - 11341 - 11341 - 113°F

Standard interfaces

Enable inputSafety interlock input to enable the EHT test output voltage
2x Logic inputsFixed functionNot assigned
Reset current length and all fault counts and positions
Maximum input voltage24 V dc
3x Relay outputsUser configurable functionHigh voltage indication
Pin-Hole detected
Bare-Patch detected
Pin-Hole or Bare-Patch detected
Maximum fault count reached
Isolated contacts, maximum rating50 VDC / 30 VAC / 0.5 A
Analogue input0 - 10 V dc; controls the EHT test output voltage, user scalable
Analogue output0 - 10 V dc; proportional to the measured EHT test output voltage, user scalable
Line speed input50 V maximum pulses, 250 kHz maximum frequency, user scalable
Standard communication interfacesCAN-bus*RS-232**
RS-422 / 485Ethernet
* CAN-bus protocol is proprietary and only for connection to other Proton Products equipment such as an optional CDI interface display unit.
** An optional RS-232-to-USB converter cable is available for connection to USB equipped computers.

Optional interfaces – must be specified for installation at time of manufacture; cannot be retrofitted

Wireless WiFi
Industrial Bus (choice of any one of)PROFIBUS