Configured for displacement measurement in turbomachinery monitoring networks, the Bently Nevada 26179-01-04-10-02 (26179 Proximity Probe) provides direct physical execution of shaft position and vibration transduction via an integrated eddy-current sensing element.
Suffix Breakdown & Model Matrix
Suffix Position
Code
Definition
Full Part Number
26179-01-04-10-02
Complete Assembly
Base Series
26179
8 mm Proximity Probe
Suffix 1
01
Unthreaded Length: 1.0 in
Suffix 2
04
Thread Type: M10 x 1
Suffix 3
10
Case Length: 1.0 in
Suffix 4
02
Cable Length: 1.0 m
Hardware Specifications
Parameter
Specification
Model
26179-01-04-10-02
Brand
Bently Nevada (Baker Hughes)
Origin
USA
Weight
0.14 kg
Dimensions
8 mm Tip Diameter; M10 x 1 Thread
Operating Temp
-34 deg C to 177 deg C
Power Consumption
Supplied via external Proximitor (requires -17.5 to -26 VDC input)
Measurement Range
2.0 mm (80 mils) linear range (dependent on system calibration)
Eddy-Current Scaling & Rotor Dynamics
This probe exhibits a linear output scaling of 7.87 mV/um (200 mV/mil) when paired with a calibrated 7200 series Proximitor. The eddy-current field generated at the 8 mm tip interacts with the conductive surface of the rotating shaft, producing a DC gap voltage proportional to the probe-to-target distance. For static position monitoring, maintain a target gap corresponding to a -10 VDC output to ensure maximum dynamic range for both positive and negative displacement excursions during rotor dynamics analysis.
Frequently Asked Questions
Q: Is this probe compatible with the 3300 XL Proximitor?
A: No. The 26179 series utilizes a different impedance and scaling profile than the 3300 XL 8 mm series. Mixing components from different series will result in incorrect gap voltage readings and measurement errors.
Q: What is the required torque for mounting the probe?
A: Apply a tightening torque of 8 N·m (71 in-lb) to the M10 x 1 locknut. Ensure the probe tip does not contact the shaft journal to prevent mechanical damage to the coil assembly.
Q: Does the probe support hot-swapping in live systems?
A: No. The probe must be installed and calibrated offline. Live disconnection can cause transient spikes that may disrupt the connected machinery protection system logic.
Field Installation Guidelines
Route the integral cable away from high-voltage power conductors and variable frequency drive (VFD) outputs to minimize electromagnetic interference (EMI). Maintain a minimum separation distance of 150 mm between the probe cable and power wiring. Terminate the shield drain wire at the Proximitor end only, ensuring a low-impedance connection to the chassis ground terminal. Verify the target surface finish is free of non-conductive coatings (paint, varnish) to ensure signal integrity.
