Emerson PR9268203-000

Working Principle

1. External vibration drives sensor outer housing to oscillate synchronously with equipment casing
2. Internal permanent magnet fixed to seismic mass block remains static due to inertial damping
3. Movable coil connected to shell cuts magnetic field lines, generates induced electromotive force directly proportional to vibration velocity
4. Raw analog voltage signal transmitted via shielded armored cable to Emerson monitoring preamplifier for signal conditioning, amplification and fault diagnosis calculation

Full Technical Specifications

• Sensitivity: 17.5 mV/(mm/s) @ 80Hz, tolerance ±5%
• Frequency Response Range: 10 Hz – 1000 Hz (standard band for turbo machinery)
• Natural Resonance Frequency: 4.5 Hz ± 0.5 Hz @ 20°C
• Max Vibration Amplitude: 3 mm peak-to-peak linear measurement range
• Amplitude Non-Linearity: Less than 2% full scale
• Acceleration Limit: 10 g continuous shock, 20 g intermittent transient shock
• Transverse Sensitivity: <0.1 mV/(mm/s) @ 80Hz (low cross-axis interference)
• Electrical Parameters: Internal coil resistance 1723 Ω ±2%, inductance 90 mH, parasitic capacitance <1.2 nF
• Operating Temperature: -20°C ~ +85°C standard model
• Storage Temperature: -40°C ~ +125°C
• Relative Humidity: 0~100% non-condensing
• Shock & Vibration Resistance: Complies IEC 60068-2-27, 5G continuous vibration
• Protection Rating: IP55 enclosure, IP65 armored cable assembly
• Explosion Certification: EEx ib IIB / IIC intrinsic safety for hazardous Zone 1/2

Material & Structural Features

1. Sensor Main Body Housing: Cast aluminum alloy, anti-corrosion black oxidation coating
2. Internal Core Components: High-strength beryllium copper spring diaphragm, samarium-cobalt permanent magnet, copper enamel measuring coil
3. Mounting Base: Carbon steel flange with 3 standard M8 mounting holes
4. Signal Cable: Stainless steel spiral armored outer sheath, PTFE insulated inner wire, 3×0.5mm² twisted shielded conductors
5. Connector: 4-pin industrial metal circular connector, dustproof locking buckle
6. Net Weight: 280g (sensor only, excluding cable)

Core Function Characteristics

1. Self-powered operation, eliminates external power wiring faults
2. Wide linear frequency band covers low-frequency casing flutter and high-frequency gear mesh vibration
3. Ultra-low transverse interference ensures unidirectional vibration measurement accuracy
4. Intrinsically safe circuit design for explosive chemical & refinery environments
5. Fully shielded armored cable suppresses industrial electromagnetic interference
6. Long-term stable drift-free output for years of unattended monitoring

Application Scenarios

• Steam/gas/water turbine generator casing vibration monitoring
• Centrifugal compressor, axial fan, large industrial pump health diagnosis
• Gearbox wear, bearing fault early warning in steel metallurgy rolling mills
• Refinery and chemical plant rotating machinery safety protection systems
• Power plant turbo-unit machinery protection racks with Emerson AMS 6500 monitoring systems

Installation Requirements

1. Mount sensor flange flat against rigid equipment casing; mounting surface flatness tolerance ≤0.05mm
2. Use grade 8.8 M8 bolts with spring lock washers, tightening torque 8–10 N·m
3. Install sensor vertically for standard omnidirectional PR9268/203 model; avoid horizontal installation for long-term high-temperature operation
4. Cable bending radius minimum 12×armor outer diameter, no sharp bends or mechanical extrusion
5. Cable routing separated from high-voltage power cables by ≥30cm to avoid EMI crosstalk
6. Ground sensor cable shield single-ended at monitoring cabinet preamplifier terminal only

Operation & Maintenance Precautions

1. Do not strike or drop sensor housing; internal spring-mass structure is fragile to heavy impact
2. Strictly prohibit cutting armored cable midway; use full-length factory cable assembly
3. Avoid long-term exposure to oil immersion, corrosive acid/alkaline liquid splashing
4. Calibrate sensor every 24 months with standard vibration shaker bench
5. Prevent over-temperature operation above 90°C; install heat insulation gaskets for hot turbine casings
6. Disconnect signal cable before welding or grinding nearby equipment to avoid coil burnout