Product Core Brief

• Model: PR6423/019-040 (Probe Assembly) + CON021 (Single Channel Rack Preamplifier)
• Brand: EPRO (Emerson Machinery Health Monitoring, Germany)
• Series: M10 eddy current probe series, factory matched for MMS3000 / A6000 turbo machinery protection racks
• Model Code Decode = M10×1 thread, 8mm sensing head, ±1mm linear span for radial shaft vibration/019 = 19 meters factory integrated high-temperature PTFE braided coaxial cable (ultra-long distance custom length)-040 = Bare stripped open cable terminals, special heavy-duty terminal wire specification, no molded Lemo plug, field cabinet terminal wiring required
• Core Function: Factory pre-calibrated non-contact eddy current measuring system for radial shaft vibration, rotor clearance and minor axial clearance on steam/gas turbines, centrifugal compressors and remote large rotating equipment SIL safety protection loops, fully compliant with API 670 machinery protection standard
• Product Type: Complete long-distance sensing kit (M10 probe head + 19m integrated high-temp braided cable + bare heavy-duty wire ends + rack-mount signal converter)
• Key Specs: M10×1 stainless steel housing, 8mm sensing tip; ±1mm linear measuring range; factory calibrated 8V/mm sensitivity matched exclusively with CON021; 19m ultra-long PTFE high-temperature cable, bare -040 reinforced wire terminal design for long-distance marshalling cabinet wiringNote: Discontinued legacy machinery monitoring hardware, stocked as unopened factory calibrated new surplus; probe and must be used as a matched calibrated set to guarantee linear measurement accuracy.

 

Key Technical Specifications

 

/019-040 Probe Assembly

1. Mechanical Structure

• Thread standard: M10 × 1 stainless steel heavy-duty mounting housing
• Sensing head diameter: 8mm standard target sensing tip, narrow installation space compatible
• Integrated cable length: 19m continuous high-temperature PTFE braided coaxial cable (long-distance field dedicated)
• Cable suffix -040: Reinforced bare stripped coaxial wire ends, thicker core wire than standard -030, designed for ultra-long cable signal attenuation control, no factory Lemo molded plug, manual terminal wiring to rear terminal block
• Minimum cable bend radius: ≥50mm, sharp tight bends damage internal coaxial core and cause long-distance signal drift
• IP rating: Probe head IP67; braided cable IP65 for long-distance tunnel/pipeline cabinet routing

2. Measurement Performance

• Full linear measuring span: ±1mm (2mm total measuring range)
• Recommended installation nominal midpoint air gap: 1.0 mm
• Calibrated sensitivity (matched ): 8 V/mm
• Max linearity error: ≤ ±1% full scale
• Frequency response: DC ~ 20kHz (-3dB), covers full turbine low/high frequency vibration spectrum
• Thermal drift index: Zero point drift 200mV / 100K; sensitivity drift ≤2% full scale per 100K
• Long-term zero drift: ≤0.3% FS over 12 months continuous turbine operation
• Long cable compensation: Factory internal impedance matching for 19m cable length to suppress long-distance signal attenuation

3. Thermal & Environmental Limits

• Probe head continuous working temperature: -35°C ~ +180°C; transient peak short-term +200°C
• Braided cable temperature rating: Max 200°C PTFE high-temperature insulation
• Storage & transport temperature: -40°C ~ +70°C
• Vibration resistance: 5g continuous vibration at 60Hz bearing housing mounting
• Working ambient pressure: Uniform 2bar external process environment
• Minimum target carbon steel shaft diameter: 25mm; stainless steel/aluminum coated rotors require on-site recalibration

 

Matched Single Channel Preamplifier Reference Parameters

• Input power supply: DC 10–30 V rack supply (standard 24VDC MMS3000 monitoring chassis)
• Probe excitation output: -26.75 VDC short-circuit protected sensor excitation power
• Analog output signal: Linear buffered voltage 0~16VDC proportional to shaft gap; receiving DCS/monitor card load impedance ≥10kΩ
• Galvanic isolation: Complete isolation between field probe measuring circuit and rack backplane bus to eliminate long-distance ground loop noise
• Cabinet operating temperature: -20°C ~ +60°C
• Form factor: Single-slot 3U DIN41612 standard 19” rack plug-in module
• PCB protection: Full acrylic conformal coating for offshore and refinery corrosive cabinet atmospheres

 

Combined Kit Mechanical Data

• /019-040 probe assembly net weight: ~0.85kg (19m long cable adds weight vs short-length models)
• module dimensions: 128mm H × 25mm W × 160mm D; weight ~0.38kg

 

Product Introduction

This 19-meter ultra-long bare wire M10 eddy current matched kit is custom engineered for large power plants, petrochemical plants with long-distance separation between turbine bearing housings and central control marshalling cabinets, fully complying with API 670 turbo machinery vibration protection standards. Adopting non-contact eddy current induction measurement principle, there is no mechanical friction and wear between the probe tip and rotating metal rotor, realizing long-term stable radial vibration monitoring for remote large rotating equipment.The core feature of /019 code is the factory integrated 19-meter ultra-long PTFE braided cable; the internal impedance is pre-calibrated at the factory to offset signal attenuation caused by ultra-long cable transmission, avoiding measurement deviation in long-distance wiring scenarios. The suffix -040 adopts reinforced thick bare wire terminals, better anti-interference and anti-break performance than standard -030 bare wire models, suitable for complex multi-layer long-distance cabinet wiring layout.After factory matched calibration with dedicated signal conditioner, the probe converts tiny coil inductance changes into standard linear 8V/mm analog signals, which can be stably transmitted over 19 meters to MMS3000 monitoring racks, PLC and DCS safety trip interlock logic for vibration protection judgment. Matched pair calibration eliminates on-site micrometer zero/gain adjustment during maintenance shutdowns, greatly shortening turbine downtime for sensor replacement.Typical application scenarios: Remote steam/gas turbine bearing radial vibration measurement points, large outdoor compressor units, machinery houses with bearing housing and control cabinet separation exceeding 15 meters.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference unique serial calibration numbers printed on probe and factory calibration certificate; inspect 8mm probe tip for scratches, 19m braided coaxial cable insulation abrasion, reinforced bare terminal wire core breakage and rack module pin bending; verify original anti-static packaging and calibration certificate seal integrity.
2. Live Bench Calibration Test: Mount probe on precision micrometer gap test jig, powered by Fluke stabilized 24VDC regulated supply paired with matched ; run 24-hour continuous full ±1mm gap sweep testing, record linearity error, zero thermal drift and 8V/mm sensitivity output under 25°C room temp and 60°C simulated cabinet operating temperature, specially verify long cable signal attenuation consistency.
3. Electrical Insulation Test: Megger insulation resistance >10MΩ between cable shield and rack ground; perform long cable bending vibration cycle test to confirm reinforced bare wire terminal connection maintains stable signal without intermittent measurement dropout.
4. Calibration Record Backup: Archive original factory calibration certificate recording nominal midpoint air gap, calibrated sensitivity and long cable compensation parameters; document rear terminal block wiring polarity for field maintenance reference.
5. Final QC Packaging: Attach serialized printed test pass tag with full linearity and long cable attenuation test data; coil the 19m braided cable with multi-layer foam separators to avoid braided wire extrusion and abrasion; separate probe and preamplifier with foam padding to prevent scratching sensing tip, seal complete kit in foam-lined static-shielded bag for warehouse storage and transit protection.

 

Installation Pitfalls & 4-Step Replacement Guide

❗ Calibration Matching Risk: Probe and preamplifier must be deployed as a complete factory-matched kit. Cross-matching with unmatched units will cause severe linearity deviation and long-distance signal attenuation error, resulting in invalid turbine vibration safety trip threshold judgment.❗ Air Gap Misadjustment Risk: Standard nominal midpoint installation gap = 1.0mm; operation outside the 0.2mm ~ 1.8mm linear window will clip analog output signals and create blind vibration fault conditions on critical SIL safety protection systems.❗ Ultra-Long Cable EMI Risk: Strictly route the entire 19m probe coaxial cable completely separated from high-current VFD and motor power cables; parallel power wiring induces severe long-distance electromagnetic noise and triggers persistent false vibration alarm signals on DCS monitoring screens.❗ Cable Bending Damage Risk: Strictly maintain ≥50mm minimum bend radius for the full 19m cable; repeated small-radius bending will permanently damage internal coaxial core, causing irreversible long-term signal drift.❗ ESD Circuit Damage Risk: Ungrounded technicians touching reinforced bare probe cable terminals or rack connector pins will damage the internal oscillator circuit inside the preamplifier; latent ESD damage causes slow zero drift that emerges after 2–4 weeks of continuous turbine runtime.

4-step replacement guide:

1. Pre-install LOTO: Lock out rotating turbine machinery and MMS3000 rack 24VDC power supply; attach grounded anti-static wrist strap to cabinet DIN rail ground bus; photograph original probe mounting thread depth and rear terminal wiring polarity for reference.
2. Removal: Unscrew legacy M10 probe from bearing housing mount; slowly uncoil the 19m long braided cable while maintaining ≥50mm minimum bend radius at all routing points; disconnect reinforced bare -040 cable terminals from old terminal block, extract preamplifier from rack slot and label all power/signal wiring.
3. Hardware Install: Thread new /019-040 probe into bearing mount; adjust lock nut to set 1.0mm nominal air gap measured via precision feeler gauge; route the full 19m braided cable away from high-current power wiring, avoid sharp metal pipeline edges and repeated small-radius bends; terminate reinforced bare -040 cable ends to new rear terminal block following original polarity; insert into empty MMS rack slot and fasten front locking screws.
4. Power-on Validation: Restore rack power supply; use micrometer gap test jig to verify linear 8V/mm analog output across full ±1mm travel range, check no signal attenuation deviation from long cable transmission; access MMS/DCS monitoring screens to confirm stable zero offset, no noise spikes and valid radial vibration readings without false safety interlock alarms.

 

FAQ

Q: Can /019-040 simultaneously measure radial vibration and axial thrust displacement?A: It can only measure small-range axial clearance within the ±1mm span. Long-range axial thrust monitoring requires the PR6424 M18 series probe with ±2mm full linear range; separate dedicated probes are recommended for simultaneous radial + thrust monitoring on turbine bearing housings.Q: What is the difference between suffix -040 and standard -030 bare wire terminals?A: -040 is reinforced thick core bare wire terminal, optimized for ultra-long cable (≥10m) transmission, stronger anti-break and anti-attenuation performance; -030 is standard thin bare wire, only suitable for cable length ≤5m medium/short-distance wiring.Q: Does the preamplifier support hot-swapping while the MMS3000 rack remains energized?A: The rack module supports live slot extraction, but all reinforced bare probe cable terminals must be fully disconnected from the terminal block first. Live disconnection of probe wiring generates inductive voltage transients that damage the preamplifier internal oscillator circuit.Q: What warranty coverage applies to bench-tested calibrated /019-040 + full kits?A: All stocked calibrated kits carry a 12-month functional warranty covering factory long-cable compensation calibration linearity, 19m braided cable integrity, reinforced bare terminal and preamplifier signal processing circuit defects. Damage caused by improper air gap adjustment, excessive small-radius cable bending, unshielded long-distance EMI wiring, reversed rack power polarity or ungrounded ESD handling is excluded from warranty coverage.Q: Is there a direct drop-in modern replacement for this discontinued ultra-long series kit?A: Emerson’s current EZ1080 M10 eddy current probe provides equivalent measurement performance, but rack pinout, -040 reinforced bare terminal wiring and factory 19m long cable impedance compensation parameters are inconsistent. Full cabinet long-distance wiring re-termination and DCS vibration trip threshold revalidation are mandatory with no unmodified direct swap solution.Q: Can multiple probes share a single preamplifier?A: Not supported. is a dedicated single-channel signal conditioner designed for one calibrated probe only. Additional vibration measurement points require independent full matched probe + kits for each monitoring channel.Q: What scenario is /019-040 19m ultra-long cable model suitable for?A: Turbine bearing housing and central control marshalling cabinet separation distance over 15 meters, outdoor large compressor units, remote machinery houses, tunnel-type long cable routing occasions where standard 1/3/4m cable length cannot meet layout requirements.