1. Cutsforth Support
  2. Erbessd Wireless
  3. Installation Planning Guide – Wireless Vibration Sensor Installation Procedure – EZDP-2146

Stud mount

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Whenever possible, it is best to drill a hole in the object and fix the sensor to the device under test (DUT) with a screw.

Stud mounting provides a stiff mechanical connection and is capable of transferring the high-frequency vibrations of the object to the sensor.

Stud mounting best meets intrinsically safe requirements since the case of the sensor is grounded to the machinery.

Figure 5. An example of a stud-mounted piezoelectric accelerometer (image used courtesy of PCB Electronics)

An example of a stud-mounted piezoelectric accelerometer (image used courtesy of PCB Electronics)

Part Numbers for Stud Mount

  • MH108-4B — 1/4-28 Mounting Stud, Stainless Steel, 0.5” (13 mm) Length

    Note

    Mounting stud is not needed with Erbessd Phantom wireless because Erbessd Phantom sensors are shipped with a stud installed

Stud Mounting Procedure

  1. Recommend using an ultrasonic thickness gauge. Recommended minimum thickness of 0.250” to 0.300”.

  2. Choose a spot face diameter that has the same diameter as the surface of the sensor.

  3. Choose the tap that matches the sensor mounting stud. Choose an appropriate pilot hole diameter, allowing the tap to create threads for the mounting stud.

  4. Create a flat spot on the surface of the machinery. Apply even pressure to insure flatness. Surface should be 0.001 inches or better. Surface finish should be 65 or better.

  5. Drill a pilot hole in the center of the flat spot that is slightly deeper than the length of the mounting stud. The pilot hole is to be perpendicular to the machine surface. Ensure a stop collar is installed on the pilot bit, to ensure the bit does not penetrate through the housing.

  6. Tap the pilot hole with the appropriate tap set. Start using the “starter tap”. Finish using the “bottom tap” which will cut threads to the bottom of the hole.

  7. Clean the surface of the mounting location.

    • Initial Cleaning:

      • Remove loose debris: Use a brush or compressed air to clear dust and particles.

      • Degrease: Wipe the surface with a lint-free cloth soaked in a solvent like isopropyl alcohol (IPA) or acetone to remove oils and grease.

  8. Apply a thread locker such as Loctite 243 to the threads of the stud to prevent loosening from shock and vibration.

  9. Screw and tighten the sensor in place, tightening to a range of 2 to 5 foot-pounds (2.7 to 6.8 Nm).

  10. Paint any exposed metal on the surface of the machine to prevent corrosion.

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