BPK-Probe™

Meet Our Shaft Voltage Detection Device

Helwig Carbon’s Patented Shaft Voltage Detection Device otherwise known as the BPK-Probe™ is an instrument designed to measure common mode voltage on a motor shaft and determine the risk of discharge through the motor bearings. It also has the capability to switch in Helwig’s Bearing Protection solution. This feature allows the user to measure the performance of our grounding device and the risk of further damage to the motor bearings once installed.

The BPK-Probe™ comes as part of a complete kit including everything you need to test motor shafts or other devices where damaging discharges may be present. A tablet oscilloscope is included for more detailed analysis of shaft voltages, but is not required to conduct testing.

Device Details

What’s Included:
  • BPK-Probe™
  • Probe Preparation Tool
  • Probe Extension Tube
  • 2 Replacement Brushes
  • Micro-USB Charge Cable
  • Tablet Oscilloscope
  • Oscilloscope Charge Cable
  • BNC Cable
  • SD Card Adapter
  • USB Stick

BPK Probe Benefits

Find damaging discharges

Determine risk
Measure the performance of your grounding device
Complete kit includes everything you need to get started.

Remote Testing options for confined, hard to access, or dangerous areas.

What is the BPK-Probe™?

How Do You Use the BPK-Probe™?

With the BPK-Probe™ grounded, typically to the motor frame, the Probe tip is placed against the rotating motor shaft and the test is performed. The BPK-Probe displays easy pass/fail results along with the measured voltage level in seconds. In addition, the BPK-Probe also has an embedded grounding device to show the effectiveness of Helwig’s  Bearing Protection Kit™ (BPK).

What Motors & Devices Should Be Tested?
Motors driven by Pulse Width Modulation (PWM) drives or Variable Frequency Drives (VFDs) are at risk of bearing damage caused by common mode shaft voltage. Typically whenever a speed control is used there is risk of voltage building on the motor shaft, causing bearing discharges.

 

Additionally, driven devices like drive shafts, drums, propeller shafts, gearboxes, etc., are all susceptible to damaging discharges due to common mode or static voltage discharge and should be monitored.
How Do I Know the Test Results Are Correct?

The Probe is factory tested and calibrated to be accurate. In addition, the Probe includes a BNC output. This output can be connected directly to the tablet oscilloscope or other 3rd party device to verify the test results.

 

Will Test Data Be Saved?

Yes. Test results are recorded on a micro-SD card and can also be recorded on the included tablet oscilloscope or other third-party devices. With the BPK-Probe DataLink App, test results can also be stored and viewed online.

Can I use My Multimeter or Digital Voltmeter (DVM) to Measure Shaft Voltage?

No. Multimeters and Digital Voltmeters (DVMs) cannot be used to measure bearing discharge potential. The method and sample rate used by these devices prevents them from properly measuring discharge potential.

 

 

Remote Testing Options

For Confined, Hard to Access, or Dangerous Areas

BPK Remote Box – BPK-Probe Required

Connect your BPK-Probe to the remote interface box to take voltage readings. Data can be synced via Bluetooth to the BPK-Probe DataLink App.

Kit Includes:

  • BPK-S with grounding cable and mounting hardware
  • Remote interface box
  • 20 ft. BNC cable

A BPK-Probe is required to use the BPK Remote Box, and must be purchased separately.

BPK RDL Remote Data Logger – No BPK-Probe Required

The BPK-RDL Remote Data Logger collects and records continuous discharge data. Data is recorded on a Micro-SD card and can be easily downloaded to a spreadsheet.

Kit Includes:

  • BPK-S
  • Micro SD cards
  • VHB mounting tape
  • BNC breakout cable
  • 15ft BNC cable
  • 10ft USB A to USB Micro B cable
  • AC100–240V input, DC 5V–1.0A USB A power adapter

Explore Shaft Grounding Resources

Learn how Helwig BPK Shaft Grounding products perform across a wide range of industries on our Applications page and access expert guidance on our Research and Literature page. You’ll find practical resources to help identify, select, and install BPK shaft grounding, learn how to test for damaging shaft voltage, and stay aligned with best practices.