Product Core Brief

• Model: /010-011
• Brand: EPRO (Emerson Machinery Health, Germany)
• Series: differential Hall-effect speed/key phase sensor series, matched with A6312 dual-channel speed rack monitor for A6000/MMS6000 turbo machinery protection systems
• Model Code Decode = Differential dual-Hall chip speed pickup (low-speed stable pulse output, no zero-speed blind zone)/010 = 1 meter factory integrated stainless steel armored braided cable-011 = Molded standard multi-pin plug connector, direct wiring to A6312 rear terminal block
• Core Function: Non-contact differential Hall transducer, collects gear tooth pulse signals to calculate shaft RPM, zero-speed standstill detection, rotation direction judgment and key phase reference signal for steam/gas turbines, centrifugal compressors, large blowers overspeed SIL safety protection loops, fully API 670 compliant
• Product Type: Complete armored cable speed probe assembly (M12 stainless sensing head + 1m metal armor cable + molded multi-pin plug)
• Key Specs: M12×1 mounting thread, dual differential Hall internal circuit; 1m anti-abrasion stainless steel armored cable; 1–12kHz pulse output frequency range; wide -40℃~+100℃ operating temp; differential anti-interference pulse signal, dedicated for A6312 monitor input channelNote: Discontinued end-of-life machinery monitoring hardware, stocked unopened new surplus; exclusive matching A6312 rack module, cannot directly connect to PR6423 series CON021 eddy current preamps.

 

Key Technical Specifications

 

/010-011 Sensor Assembly

1. Mechanical Structure

• Mount thread: M12 × 1 stainless steel cylindrical housing
• Sensing head diameter: 12mm, standard gear tooth installation clearance design
• Integrated cable length: 1m continuous stainless steel outer armored braided cable (anti-scratch, anti-lubricant oil corrosion)
• Cable suffix -011: Integrated molded multi-core plug terminal, unified pin definition for A6312 rear wiring terminals
• Minimum cable bend radius: ≥40mm; sharp bending will deform metal armor and break internal signal wires
• IP rating: Sensing head IP67; armored cable IP68 resistant to oil splash and mechanical friction

2. Measurement & Electrical Performance

• Working principle: Dual differential Hall element half-bridge circuit, eliminates single Hall magnetic drift and low-speed signal loss, stable pulse at near zero RPM
• Supply voltage: 10–30VDC DC excitation power (powered by monitor internal power supply)
• Current consumption: ≤20mA @24VDC nominal input
• Output signal: Differential square wave pulse, anti-common-mode EMI interference
• Frequency bandwidth: 0Hz (zero speed) ~12kHz, maximum measurable speed 65535 RPM
• Detectable gear tooth range: 1–255 teeth configurable on
• Measuring accuracy: Speed error ≤±0.1%, repeatability ≤±0.05% full scale
• Recommended installation air gap: 1.0–1.5mm for standard module 1/2 steel gear targets
• Target material: Soft carbon steel gear teeth; stainless steel gear reduces signal amplitude, needs gap adjustment

3. Thermal & Environmental Limits

• Sensing head continuous operating temperature: -40℃ ~ +100℃; short-term peak +110℃
• Metal armored cable temperature rating: -40℃ ~ +100℃
• Storage temperature: -40℃ ~ +100℃
• Vibration resistance: 50g peak continuous vibration at 60Hz bearing housing mounting
• Ambient humidity: 5%–95% non-condensing, resistant to turbine oil mist environment
• Hazardous certification: FM Class I Div 2 Groups A/B/C/D cabinet mounting certified

 

Matching Speed Monitor Reference Parameters

• Input channel: Dual galvanically isolated pulse input, dedicated for Hall sensor or PR6424 eddy speed probe
• Rack supply: 24VDC dual redundant power input
• Per-channel outputs: Isolated SPDT alarm relay (overspeed/underspeed/zero-speed/sensor fault); isolated 4–20mA analog RPM signal
• Communication: Front Mini-DIN RS232 local configuration port; rear RS485 bus for historical trending
• Form factor: Single-slot 3U hot-swappable rack module for A6000 chassis

 

Mechanical Weight & Dimension

• /010-011 assembly net weight: ~0.21kg (metal armor adds weight vs non-armor models)
• module dimensions: 128mm H × 25mm W × 160mm D

 

Product Introduction

This 1m metal armored differential Hall speed probe is the standard pulse pickup for EPRO A6000/MMS6000 turbine overspeed protection systems, widely deployed in power plant steam/gas turbines and petrochemical compressors. Different from traditional single-coil magnetic speed sensors, dual differential Hall internal design ensures stable complete pulse waveform at ultra-low rotating speed, realizing reliable zero-speed standstill interlock protection to avoid blind speed measurement faults during unit startup/shutdown.The /010 code stands for 1m factory pre-assembled metal armored cable, specially designed for bearing housing areas with dense lubricating oil pipelines and frequent equipment maintenance friction; stainless steel armor effectively prevents cable outer sheath scratch and oil corrosion, extending service life in harsh machinery house environments. The molded -011 multi-pin plug unifies wiring pinout, simplifying on-site marshalling cabinet wiring without stripping cable cores.It transmits differential anti-interference pulse signals to rack monitor, which converts tooth frequency into real-time RPM values and triggers independent overspeed/zero-speed alarm relay contacts for DCS safety trip logic, while outputting 4–20mA analog speed signals for long-term trending recording.Typical application scenarios: Turbine main shaft overspeed redundant measurement, compressor rotor zero-speed standstill interlock, unit startup key phase vibration phase reference collection.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference OEM serial batch logs; inspect M12 sensing head surface for scratches, metal armor deformation, cracked molded plug shell and internal pin bending; verify original anti-static packaging seal integrity.
2. Live Bench Testing: Mount probe on gear rotation test jig, powered by Fluke stabilized 24VDC supply paired with monitor; run 24-hour continuous RPM sweep test 0–12kHz, validate pulse waveform integrity, overspeed relay trip logic and 4–20mA analog output linearity.
3. Electrical Insulation Test: Megger insulation resistance >10MΩ between signal core and armor shielding ground; perform cable bending vibration cycle test to confirm molded plug maintains stable differential pulse without intermittent dropout.
4. Configuration Backup: Archive factory default parameter template (gear tooth count, overspeed trip threshold, pulse filter window) for field maintenance reference.
5. Final QC Packaging: Attach serialized printed test pass tag listing speed linearity and pulse waveform test results; coil 1m armored cable with foam separators to avoid armor extrusion deformation; seal assembly in foam-lined static-shielded bag for transit protection.

 

Installation Pitfalls & 4-Step Replacement Guide

❗ Matching Compatibility Risk: Hall sensor only supports speed monitor input channels; cannot connect to PR6423 series CON021 eddy current preamplifiers, mismatched front-end hardware will output no valid pulse signals.❗ Air Gap Misadjustment Risk: Standard installation gap =1.0~1.5mm; gap over 2mm weakens differential pulse amplitude, causing missing tooth count and false overspeed trip faults on SIL safety loops.❗ Armor Cable Bending Risk: Strictly maintain ≥40mm minimum bend radius; repeated small-radius bending permanently crushes internal multi-core signal wires leading to intermittent speed signal dropout.❗ EMI Interference Risk: Route full 1m armored cable completely separated from VFD high-current motor power cables; parallel power wiring distorts differential pulse waveform triggering random speed alarm jumps on DCS screens.❗ ESD Circuit Damage Risk: Ungrounded technicians touching molded plug pins damage internal Hall differential chip; latent ESD damage causes slow pulse attenuation appearing after 2–4 weeks continuous turbine runtime.

4-step replacement guide:

1. Pre-install LOTO: Lock out rotating turbine machinery and A6000 rack dual 24VDC power supply; attach grounded anti-static wrist strap to cabinet DIN rail ground bus; photograph original probe mounting thread depth and molded plug wiring pin mapping for reference.
2. Removal: Unscrew legacy M12 probe from gear tooth mounting bracket; carefully uncoil 1m armored cable maintaining ≥40mm bend radius; disconnect molded multi-pin plug from rear terminal block, label all power and signal wiring terminals.
3. Hardware Install: Thread new /010-011 probe into mounting bracket; adjust lock nut to set 1.2mm nominal air gap measured via precision feeler gauge; route metal armored cable away from high-current power pipelines, avoid sharp metal flange edges scratching armor outer layer; insert molded plug into rear terminal block following original pin polarity, fasten cable fixing clip to eliminate vibration pull force on plug pins.
4. Power-on Validation: Restore rack power supply; simulate full gear tooth RPM sweep test 0–12kHz, verify complete stable differential pulse waveform; access /DCS monitoring screens to confirm accurate real-time RPM reading, no missing tooth count, overspeed relay trip activation and stable 4–20mA analog speed output without noise-induced false fault alerts.

 

FAQ

Q: Can /010-011 simultaneously realize speed measurement and key phase signal collection?A: Yes. When a single tooth trigger gear is installed on the shaft, the sensor outputs one pulse per revolution as key phase reference signal for rotor vibration phase analysis; multi-tooth gears are used for continuous RPM calculation.

Q: What is the core difference between Hall speed probe and PR6424 eddy speed probe?

1. : Differential Hall active sensor, built-in excitation circuit, outputs square wave pulse, supports zero-speed detection, needs monitor
2. PR6424+CON021: Eddy current displacement probe, outputs analog gap voltage, no built-in pulse shaping, only calculates speed via signal fluctuation, cannot reliable measure near zero RPM

Q: Does monitor support hot-swapping while the A6000 rack remains fully energized?A: Module rated hot-swappable, but molded plug wiring must be fully disconnected before extracting from rack slot; live wire disconnection generates inductive voltage spikes damaging internal pulse comparator circuits.

Q: What warranty coverage applies to bench-tested surplus /010-011 sensors?A: All stocked assemblies carry a 12-month functional warranty covering differential Hall chip, metal armored cable integrity, molded plug and pulse output circuit defects. Damage caused by improper air gap adjustment, excessive small-radius cable bending, unshielded EMI wiring, reversed excitation power polarity or ungrounded ESD handling is excluded from warranty coverage.

Q: Is there a direct drop-in modern replacement for discontinued series speed probe?A: Emerson current AMS speed pickup series provides equivalent differential Hall pulse performance, but M12 mounting thread armor cable structure, molded plug pin definition and rack input signal level differ; full cabinet wiring re-termination and turbine overspeed trip threshold revalidation mandatory, no unmodified direct swap solution.

Q: What scenario chooses the -011 molded plug armored cable model /010-011?A: Bearing housings within 1m distance from marshalling cabinets, oil mist/vibration heavy machinery houses requiring anti-abrasion metal armor, projects requiring unified plug wiring without on-site cable stripping terminal processing.