loop powered vibration sensor Amphenol PC421VR-20-IS for plant machinery health

Product Overview

Wilcoxon's 4-20 mA LPSTM Series transducers are self-contained vibration transmitters designed to integrate directly with Programmable Logic Controllers (PLCs) or Distributed Control Systems (DCS). These loop-powered sensors enable plant personnel to input vibration information directly into control systems, facilitating the trending of overall vibration data, correlation with plant operating conditions, and scheduling of maintenance tasks. They are crucial for Condition Based Maintenance (CBM) programs, providing continuous monitoring of critical machinery and assisting operators in identifying and addressing severe vibration issues even in the absence of a dedicated vibration analysis technician. The LPS Series offers a cost-effective and reliable solution for machine health monitoring, helping to prevent failures and reduce outages.

Product Attributes

• Brand: Wilcoxon Sensing Technologies
• Series: LPSTM (Loop Powered Sensors)
• Certifications: CSA (for U.S. and Canada), LCIE ATEX
• Hazardous Area Ratings: Intrinsically Safe (IS), Explosion Proof (EX)

Technical Specifications

Measurement Basis: Velocity is the primary measurement for machinery vibration on external cases. LPS Series transducers are available measuring in terms of velocity or acceleration.

Output Signal: 4-20 mA loop powered. Available output calibrations include Peak, RMS, or True Peak for broadband transducers. Frequency banded transducers offer Peak or RMS calibration.

Full Scale Selection: Full scale is user-selectable and not adjustable. Guidelines suggest the normal vibration level should fall within 10-20% of the full-scale range, and manufacturer-specified limits or ISO 10816 should be used to determine the appropriate range.

ISO 10816 Guidance: Part 3 of ISO 10816 is used for evaluating industrial machines (nominal power > 15 kW, speeds 120-15,000 RPM). Machines are classified into groups (1, 2, 3, 4) and evaluated based on rotor mode (rigid or flexible).

Equipment Groups (ISO 10816-3):

• Group 1: Large machines (> 300 kW / ~400 HP); shaft height 315 mm (12.4), typically sleeve bearings.
• Group 2: Medium-size machines (15 kW to 300 kW / ~20 HP to ~400 HP); shaft height 160 mm to 315 mm (6.3 to 12.4), typically rolling element bearings, speeds > 600 RPM.
• Group 3: Pumps with multivane impeller and separate driver (> 15 kW).
• Group 4: Pumps with multivane impeller and integrated driver (> 15 kW).

Evaluation Zones (ISO 10816-3):

• Zone A: Normal for newly commissioned machines.
• Zone B: Acceptable for unrestricted long-term operation.
• Zone C: Unsatisfactory for long-term continuous operation; limited operation possible.
• Zone D: Potentially damaging severity.

ISO 10816-3 Recommended Zone Set Boundaries:

Frequency Banded Transducers:

• Low Frequency (e.g., PC420VP-10-B3041): Filters focus output to 3 Hz (180 RPM) to 40 Hz (2400 RPM) for trending balance and alignment issues.
• High Frequency (e.g., PC420AR-10-3223): Filters focus output to 300 Hz (18,000 RPM) to 2,000 Hz (120,000 RPM) for trending pump cavitation.

Dual Output Transducers: Provide both a 4-20 mA loop signal and a broadband dynamic signal (100 mV/g acceleration or 100 mV/ips velocity) for use with portable spectrum analyzers.

Hazardous Area Installations:

• Intrinsically Safe Models: End in -IS. Certified for CSA Class 1, Div 1, GRPS A, B, C, D T3C and LCIE ATEX EEx ia IIC T3.
• Explosion Proof Models: End in -EX. Certified for CSA Class 1, Div 1, 2 GRPS A, B, C, D; Class 2, Div 1, 2 GRPS E, F, G; Class 3, Div 1, 2 T3C and LCIE ATEX EEx d IIC T3 / EEx nA IIC T3.

Model Number Ordering Guide (Partial):

Example Model Numbers:

• PC420VP-10: Velocity, Peak calibrated, 1.0 ips full scale.
• PC420VP-10-DA: Velocity, Peak calibrated, 1.0 ips full scale, with additional Dynamic Acceleration output (100 mV/g).
• PC420VP-10-IS: Velocity, Peak calibrated, 1.0 ips full scale, Intrinsically Safe rated.
• PC420VP-10-B3041: Velocity, Peak calibrated, 1.0 ips full scale, band-limited 3-40 Hz.
• PC420AR-10-B3223: Acceleration, RMS calibrated, 10 g full scale, band-limited 300-2,000 Hz.