Epro Emerson PR9376/20 Speed Sensor Probe

Configured for contact-less rotational speed measurement and proximity sensing on ferromagnetic targets in turbomachinery applications, the Emerson PR9376/20 (PR9376 Speed Sensor Probe) provides direct physical execution.

Suffix Breakdown & Model Matrix

• Base Model (PR9376): Basic non-contact speed and impulse sensing unit for ferromagnetic targets.
• Suffix (/20): Designates specific mechanical thread configuration, cable length, and connector termination standard.

Hardware Specifications

Eddy-Current & Magnetic Sensing Dynamics

The sensor utilizes magnetic field modulation induced by passing ferromagnetic teeth, keyways, or impulse wheels. Proper installation requires precise gap voltage validation and mechanical alignment to eliminate signal cross-talk and maintain optimum impulse amplitude across high rotational velocity spectrums.

Frequently Asked Questions

Q: What is the recommended target gap distance during installation?

A: The optimal physical gap between the sensor pole piece and the target wheel typically ranges between 0.5 mm and 1.5 mm, depending on target tooth module size and circumferential speed.

Q: Can the cable length be modified without recalibrating the signal evaluation unit?

A: Because passive speed probes rely on specific inductance and resistance profiles, altering cable length can alter signal attenuation; verification of signal amplitude at minimum operational RPM is required after modification.

Field Installation Guidelines

• Ensure a minimum of 5 full threads of engagement when mounting into tapped housing ports.
• Route sensor cabling through grounded metal conduit away from high-voltage motor leads and variable frequency drive (VFD) outputs to prevent high-frequency interference.
• Verify that signal cable shielding is grounded at a single point (typically at the cabinet barrier/rack terminal) to eliminate ground loops.
• Use a feeler gauge to confirm mechanical clearance across 360 degrees of shaft rotation prior to initial power-up.