PR9268/203-000 | Emerson EPRO Electrodynamic Velocity Sensor

PR9268/203-000 is a passive, self-powered electrodynamic seismic velocity transducer from Emerson EPRO, engineered for low-frequency absolute casing vibration measurement on bearing pedestals, turbine casings, pump and fan housings for Turbine Supervisory Instrumentation (TSI) and machinery protection systems. This vertical mount variant is equipped with flange base mounting design; suffix -000 means no factory pre-installed armored cable, users can select custom field cable type and length according to site layout.

It operates based on seismic electromagnetic induction principle and outputs AC voltage proportional to casing vibration velocity without external excitation power. With lower natural frequency and wider low-frequency response compared to standard PR9268/200,201,202 versions, it is ideal for hydro turbines and large slow-speed rotating equipment. Widely deployed in power, oil & gas and petrochemical industries, it is commonly paired with PR6426 eddy current probes to complete full shaft relative vibration and casing absolute vibration monitoring for turbo machinery.

Key Features

• Self-powered passive electrodynamic velocity pickup, no external power supply required
• Vertical installation with flange base for stable mounting on large machine casings
• No factory pre-fitted armored cable (-000), field wiring with custom cable optional
• Sensitivity: 28.5 mV/mm/s (±5% @80Hz, 20°C, 100kΩ load)
• Frequency response: 4 Hz ~ 1000 Hz, natural frequency 4.5Hz ±0.75Hz
• Max continuous acceleration 10g; intermittent peak acceleration up to 20g
• Low transverse sensitivity <0.1 at 80Hz, suppress cross-axis measurement interference
• Robust stainless steel housing, IP55 protection grade, dust and splash resistant
• Sensor operating temperature: -40℃ ~ +100℃
• Flange mounting base for heavy-duty installation on large bearing housings
• Amplitude linearity <2%, low long-term drift and excellent repeatability for safety trip interlock
• Compatible with EPRO MMS6000, MMS6100 monitoring racks and Emerson AMS 6500 system
• API 670 compliant for critical rotating machinery protection

Technical Specifications

Model: PR9268/203-000 Brand: EPRO (Emerson) Sensor Type: Electrodynamic seismic velocity transducer (passive self-powered) Mount Orientation: Vertical Z-axis casing vibration, flange base Cable Version: -000 = connector termination, no factory pre-assembled cable Measurement Principle: Electromagnetic induction, self-generating AC voltage Sensitivity: 28.5 mV/mm/s ±5% Frequency Response: 4 Hz ~ 1000 Hz Natural Frequency: 4.5 Hz ±0.75Hz @ 20°C Max Vibration Amplitude: 3000 μm peak-to-peak Amplitude Linearity: <2% Continuous Acceleration: 10g peak Intermittent Acceleration: 20g peak Transverse Acceleration Limit: 2g Transverse Sensitivity: <0.1 @80Hz Sensor Operating Temperature: -40℃ ~ +100℃ Housing Material: Stainless steel Mounting: Flange base mounting Protection Grade: IP55 Internal Resistance: 1875Ω ±10% Inductance: ≤90 mH Output Signal: AC voltage proportional to casing vibration velocity Recommended Load: ≥100 kΩ input impedance for monitoring unit Measured Parameter: Absolute bearing housing vibration velocity (mm/s)

Applications

• Power generation: Hydro turbine, low-speed steam turbine bearing housing vertical absolute vibration monitoring
• Oil & gas: Large low-speed centrifugal compressors, expanders and process pump casing vibration protection
• Petrochemical: Critical slow-speed rotating equipment condition monitoring, vibration alarm and safety trip protection
• Heavy industry: Large fans, blowers and hydro-unit casing low-frequency vibration measurement
• TSI machinery protection system: Combined with PR6426 eddy current probes to realize complete rotor and casing monitoring

Why Choose PR9268/203-000

EPRO PR9268/203 series velocity transducers are specially designed low-frequency flange type casing vibration sensors for slow-speed turbo machinery. PR9268/203-000 vertical flange version without factory pre-made cable provides maximum flexibility for field wiring. Engineers can deploy custom armored cables, high-temperature cables or different cable lengths to match site routing requirements.

Compared to PR9268/200,201,202 standard 14Hz natural frequency sensors, PR9268/203-000 with 4.5Hz natural frequency excels at capturing low-frequency vibration signals of hydro turbines and large slow rotating machines. As a passive self-powered transducer, it eliminates measurement failure risks caused by sensor power loss. The sturdy stainless steel housing performs reliably in oily, dusty industrial environments.

We supply original new PR9268/203-000 velocity sensors with inspection report and factory calibration certificate, global air & sea shipping available. We also accept inquiries for other PR9268 variants with different orientation and cable suffix codes. Contact us for datasheet, dimension drawing and formal quotation.

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FAQ

Q: What does PR9268/203-000 measure?

A: It measures absolute vertical low-frequency casing vibration velocity of bearing housings and machine casings, mainly used for hydro turbines and large slow-speed rotating machinery TSI protection.

Q: What do /203 and -000 mean?

A: /203 = vertical flange base mounting, low-frequency version; -000 = without factory pre-installed armored cable, field cable assembly required.

Q: Does PR9268/203-000 require external power supply?

A: No, it is passive self-powered electrodynamic velocity sensor; mechanical vibration generates the AC output signal.

Q: What systems can PR9268/203-000 connect to?

A: Compatible with EPRO MMS6000, MMS6100 series monitors and Emerson AMS 6500 machinery health systems.

Q: What is the difference between PR9268/203-000 and PR9268/202-000?

A: PR9268/202-000: standard 14Hz natural frequency, M8 stud mount, 17.5mV/mm/s sensitivity for steam/gas turbine. PR9268/203-000: low-frequency 4.5Hz natural frequency, flange base mount, 28.5mV/mm/s sensitivity for hydro turbine and low-speed rotating equipment.

PR6426/000-010+CON021

Our products are widely used in CNC mechanical metallurgy, petroleum and natural gas, and petrochemical industries,Chemical industry, paper and printing, textile printing and dyeing, machinery, electronic manufacturing, automobile manufacturing,Plastic machinery, electricity, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution.The quoted price is not the actual price. Please contact the shopkeeper before placing the order to confirm the price and delivery time!!!

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