Description

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The PR6424/000-131+CON031  is a non-contact Hall effect speed/proximity sensor manufactured by EPRO (now part of Emerson) in Germany. It is specifically designed for speed measurement and proximity detection in critical rotating machinery (steam turbines, gas turbines, water turbines, compressors, pumps, fans, etc.) and is widely used in TSI (Turbine Monitoring and Protection Systems), such as the EPRO MMS 3000 / MMS 6000 systems.

　　Core Technical Parameters

　　Parameter Specifications

Measurement Principle: Hall effect (non-contact), differential dual Hall element half-bridge structure

Trigger Frequency Range: 0 ~ 12 kHz (some data indicates up to 20 kHz)

Supply Voltage: 8 ~ 31.2 V DC (typical 10~30V, commonly used 24V DC)

Output Signal: Digital pulse (rectangular wave), push-pull output

High Level > 10 V (≥7V with 100kΩ load/12V supply)

Low Level < 1 V (≤1V with 100kΩ load/12V supply)

Pulse Rise and Fall Time: < 1 µs

Allowable Clearance (Gear Module m=1): ≤ 1.0 mm

Allowable Clearance (Gear Module m≥2): ≤ 1.5 mm

Operating Temperature: -30℃ ~ +100℃ (extreme short-term) 120℃

Protection Rating: IP55 / IP66 (compliant with DIN 40050)

Probe Diameter: Φ14 mm (head diameter approx. 5 mm effective sensing area)

Sensor Total Length: Approx. 124~155 mm

Thread Specification: M6 × 1

Cable: 3 m or 5 m armored shielded cable (PTFE insulated)

Weight: PR6424/000-131+CON031: Approx. 330g (with packaging) / 210g (net weight)

Explosion-proof Certification: Eex ib IIC T6/T4 (Special version, safety barrier required)

Standards Compliant with: API 670, DIN 45670, ISO 10817-1

Working Principle:

Triggering: Gear rotation → Tooth/groove alternately passes the sensor → Magnetic field change → Differential Hall element sensing → DSP digital processing → Comparison with reference threshold → Push-pull output high/low level switching → The rectangular pulse output sensor head has two built-in Hall elements forming a differential half-bridge, which is extremely sensitive to changes in the magnetic field. When the soft magnetic/steel toothed disc passes by, the magnetic field is locally enhanced, and the Hall voltage difference increases; when the tooth groove passes by, the magnetic field weakens, and the Hall voltage difference decreases. The internal DSP digitally processes the Hall voltage difference value and drives the push-pull output stage to switch quickly after comparing it with a preset reference value. Zero speed measurable: The Hall effect is a static magnetic field effect. Even at extremely low speeds or zero speeds, as long as the tooth is in a specific position, a stable level can be output—this is a core advantage over magnetoelectric sensors. Typical Application Scenarios Table Application Area Specific Uses Steam Turbine/Gas Turbine Speed ​​Monitoring, Overspeed Protection (Overspeed Trip) Water Turbine Speed ​​Measurement and Frequency Tracking Compressor/Pump/Fan Speed ​​Monitoring, Start/Stop Detection TSI System in conjunction with MMS 3000/6000 monitoring and protection system, connected to MMS6312 speed monitoring board, etc. Engine ECU speed signal input Industrial Automation Valve position feedback, robotic arm motion control

　　Requirements for Matching Gear Plates

Gear Plate Parameter Requirements

Material Soft Magnetic Steel (ST 37) or Stainless Steel

Tooth Profile Straight or Involute Tooth

Module m=1 Clearance ≤1.0 mm

Module m≥2 Clearance ≤1.5 mm

Comparison of Common Models in the Same Series

　　Model Description

PR9376/010-011 Standard Type (3m) Cable

PR9376/010-001 Standard Type (Another Version)

PR9376/010-021 Standard Type (Another Version)

PR9376/20 3m Armored Cable Version

PR9376/20CS 5m Armored Cable Version

PR9376/00 No Cable (Requires Separate Purchase)

　　Installation Points

The probe axis must be perpendicular to the end face of the gear plate to ensure maximum magnetic field variation.

Strictly control the installation gap (m=1 gear ≤1mm, m≥2 gears ≤1.5mm). Excessive gap will cause signal loss.

Use shielded cable, keep away from power cables, and avoid electromagnetic interference.

It is recommended to check probe cleanliness, cable connections, and linearity every 6 months.

The PR6424/000-131+CON031 is a classic Hall effect speed sensor in the EPRO TSI system, known for its zero-speed measurability, high anti-interference capability, wide temperature range, and IP66 protection. It is the preferred solution for speed monitoring of critical rotating equipment such as steam turbines and compressors.

Recommended related products:
EPRO PR9376/010-011
EPRO PR9376/010-011 9200-00097
EPRO PR9376/010-011
EPRO PR9376/20
EMERSON PR9376/010-011 Electric vibration sensor-PR9376
EMERSON PR9376/20 Electric vibration sensor-PR9376/20
EPRO CON021/916-160 9610-00013N
PPC/PMC-8260/DS1 EMERSON
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