EPRO PR9376/010-011 Speed Sensor (Specification - No Diagram Version)

I. Product Overview

PR9376/010-011 is a Hall effect type speed/proximity sensor under the EPRO brand of Emerson. It is used for measuring the speed, zero speed, and gear phase of rotating machinery such as steam turbines, compressors, and fans, and is a standard configuration of the MMS6000 TSI system.

## II. Model Meaning

PR9376: Series No. (Hall Speed Sensor)

010: Cable specification (Unarmored, 1m length)

011: Version / Output Code

## III. Working Principle

Adopts Hall differential measurement: Built-in dual Hall elements. When facing the speed measuring gear (soft magnetic steel), the gear addendum/dedendum causes magnetic field changes, outputting square-wave pulses proportional to the rotational speed with stable performance even at low speeds.

## IV. Technical Parameters

### Measurement Performance

Frequency Range: 0～20kHz (0rpm measurable)

Sensitivity: 16V/mm

Measuring Gap: 0.5～1.5mm (1.0mm recommended)

Output Signal: Rectangular pulse, High level ≥9V, Low level ≤1V (Power supply: 8～31.2VDC)

### Environmental & Physical Specifications

Power Supply: 8～31.2VDC, Reverse polarity protection

Temperature Range: -30℃ ～ +100℃

Probe Dimension: Φ14×155mm, Thread M14×1.5

Cable: 1m unarmored, Double shielding (Tinned copper mesh + Aluminum foil)

Protection Grade: IP67, Fully sealed

### Matching Requirements

Speed Measuring Gear: Soft magnetic steel (e.g. 42CrMo4), Tooth width ≥5mm, Module ≥2

Addendum Circle Diameter: ≥30mm; Gear surface roughness Ra≤3.2μm

## V. Installation Requirements

### Mechanical Installation

Method: Fixed by M14×1.5 thread, probe perpendicular to gear surface

Gap: 1.0mm (From gear addendum to probe end face)

Position: Probe center aligned with gear width center, edge distance from gear side ≥2mm

Torque: Lock nut 25～30N·m

### Cable Laying

Route: Keep away from power cables (≥300mm), avoid parallel laying

Shielding: Single-point grounding (Ground only at the monitoring system side)

Length: Standard 1m, extendable up to 10m (Use shielded twisted pair)

## VI. Wiring Definition (3-core + Shield)

Brown Wire: +VDC (8～31.2V)

Black Wire: 0V (Ground)

White Wire: Pulse signal output

Shield Layer: Grounded at system side, floating at probe side

## VII. Commissioning and Calibration

Power-on Inspection: With normal power supply, output high level when no rotation; output pulses when gear passes by.

Gap Adjustment:

Insert a 1.0mm feeler gauge between the probe and gear addendum

Slowly push the probe until lightly touching the feeler gauge, then fasten the lock nut

Signal Verification: Rotate the gear, measure pulse frequency with multimeter/oscilloscope, which shall be consistent with rotational speed × number of teeth.

## VIII. Troubleshooting

### No Pulse Output

Check power supply (8～31.2VDC) and wiring polarity

Measure probe resistance: Brown-Black approx. 120Ω, White-Black open circuit

Excessively large/small gap: Readjust to 1.0mm

### Unstable Pulse / Pulse Loss

Incorrect shield grounding: Change to single-point grounding

Interference: Keep away from frequency converters and motors

Unqualified gear material/surface: Adopt soft magnetic steel and clean gear surface

### Low Output Amplitude

Low power supply voltage: ≥12VDC is optimal

Gap over 1.5mm: Adjust down to 1.0mm

## IX. Matching and Model Selection

Matching Equipment: MMS6210 (Speed Module), MMS6823 (Communication Module), DCS/DEH

Order Model: PR9376/010-011 (1m unarmored); Optional 3m/5m armored type (PR9376/20...)