General Information

Core Description

Engineered for industrial casing vibration measurement, the PR9268/201-100 is an Emerson AMS electrodynamic velocity sensor optimized strictly for vertical mechanical orientations within a operating arc. This self-powered transducer features an integrated 5-meter stainless steel armored PTFE cable terminated with a standard Harting plug to prevent hazardous lead exposure in heavy machinery cells. It monitors absolute machine housing movement across a wide 4 to 1000 Hz frequency range, delivering a robust 28.5 mV/mm/s sensitivity with an amplitude linearity error of under 2% to eliminate localized data distortion in critical plant sectors.

Specific Application

• Critical Turbomachinery Displacement Tracking: Measuring radial shaft vibration, axial position, eccentricity, and key/speed metrics on industrial steam, gas, and hydro turbines, compressors, pumps, and fans.
• High-Frequency Transient Monitoring: Tracking rapid dynamic shaft movements in high-speed auxiliary machinery where the signal rise time must remain below 15 µs to prevent unmonitored bearing degradation.

Ordering Information

*No Cable is only available, if “Omni Directional” Sensor is chosen.

**Open Cable End is not available for “HT” versions.

***C-5015 Plug is only available, if “No Cable” is chosen.

System Compatibility

• System Compatibility: The PR9268/201-100 is a completely self-powered passive sensor that operates without an external driving current source. It features an integrated 3x0.5mm² PTFE signal cable jacketed in stainless steel armor and connects smoothly to plant monitoring racks via a heavy-duty die-cast aluminum Harting plug. This module fully interfaces with Emerson AMS machinery protection systems and standard vibration transmitters with a high input impedance matching its 1875  internal coil resistance.
• Direct Application Alternates: PR9268/301-100 (Horizontal Core Alternate) and PR9268/601-000 (High-Temperature Vertical Alternate).
• Key Differences from Alternates (PR9268/201-100 vs. 301-100 / 601-000):
• Mechanical Installation Axis: The PR9268/201-100 is engineered strictly for vertical mounting positions (axis). Attempting to rotate it horizontally causes the internal seismic mass to bind against the dampening tube. Conversely, the PR9268/301-100 is configured exclusively for horizontal shaft measurement planes (axis).
• Thermal and Electrical Thresholds: While the PR9268/201-100 handles standard environments from -20 to +100 °C with an IP55 housing rating, the PR9268/601-000 is an advanced high-temperature (HT) variant certified up to +200 °C with an upgraded IP65 stainless steel casing. Electrically, the 601-000 model drops sensitivity to 22.0 mV/mm/s and requires an active sinking current to extend its mounting range to , making the PR9268/201-100 a much more efficient option for standard temperature loops.

Installation & Troubleshooting FAQ

Q1: What will happen if I install a PR9268/201-100 velocity sensor at a 45-degree angle on a pump casing?

A: The PR9268/201-100 features a tight directional limitation of vertical without sinking current. Mounting the sensor at a 45-degree tilt forces the internally suspended spring-mass system out of its linear path, causing mechanical friction against the internal walls. This binding results in a severe loss of sensitivity, an increased transverse sensitivity spike, and distorted output data that can mask real machine degradation.

Q2: How do I test the internal coil of the PR9268/201-100 to verify if the module has suffered a field failure?

A: Turn off system loops, disconnect the aluminum Harting plug, and use a digital multimeter to test the center pin terminals. At a normal ambient room temperature of 20 °C, a healthy PR9268/201-100 must show a nominal DC loop resistance of 1875 and a coil inductance under 90 mH. A reading of infinity indicates an open internal wire breakdown, while a value near 0 signals a shorted coil requiring immediate unit replacement.

Q3: What are the continuous acceleration limitations to prevent mechanical damage to the PR9268/201-100?

A: The electrodynamic layout handles high shock profiles but has fixed fatigue limitations. The sensor is rated for a maximum continuous acceleration of 10g peak-peak continuous. It can briefly absorb an intermittent acceleration peak of up to 20g intermittent, but running the module beyond these bounds will risk permanent alignment damage to the internal dampening suspension. Additionally, ensure the transverse (cross-axis) acceleration stays below 2g.

Q4: The sensor cable junction is exposed to heavy synthetic turbine oil washdowns. How do I protect the connection?

A: While the PR9268/201-100 housing features an IP55 environmental ingress barrier and a robust PTFE cable jacket, the die-cast aluminum Harting plug termination remains vulnerable to moisture tracking or conductive fluid ingress over time. To prevent signal grounding issues or corruption, always wrap the Harting connector junction tightly using self-fusing waterproof rubber tape followed by an outer layer of protective vinyl PVC wrap, or position the connection point inside a sealed, IP65-rated auxiliary junction box.

Q5: What are the strict ambient temperature bounds when deploying the PR9268/201-100 inside an ATEX gas zone?

A: The PR9268/201-100 carries extensive global hazardous certificates for Intrinsic Safety (II 1G Ex ia IIC Ga). The temperature classification is directly linked to your field environment: the module maintains a T6 rating across an ambient frame of -20 °C Tamb 68 °C, and scales up to a T4 rating if the ambient zone stays between -20 °C and 108 °C. If your machine surface temperatures exceed 100 °C, you must drop the standard model and install a high-temperature version (PR9268/60x) to avoid explosion hazards.