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PMC/BETA Corporation

Leading supplier of solid state vibration switches for preventative maintenance and monitoring, velocity transducers and testing/balancing instrumentation.

Detect machinery problems before damage occurs

The most complete line of vibration switches and monitors available.

Whatever your vibration monitoring needs are, the answer is available from the choice of PMC/BETA monitors. The 440 vibration switch series extends from single trip models (440S) to models with dual trip and 4-20mA output (440D-R). Available options include: a separate transducer, remote meter, or a digital meter mounted in the 440.

If you require a monitor with only a single trip, the Model 220 is a revolutionary breakthrough in size and weight.

The Model 162VTR vibration transmitter provides a 4 to 20mA signal only for interface with a computer-based monitoring system.

If you need a control room monitor and display, the Model 3000 bar graph monitor will do the job.

• Single and Dual Trip Vibration Switches. The Models 220 and 440S vibration switches provide a single switch closure which can be used for alarm or shutdown. However, it is often desired to provide a warning before shutdown. The Model 440D is ideal for this requirement. It provides two trips: one for alarm and one for shutdown.
• Vibration Transmitters. The 4 to 20mA output available on the Models 440S-R and 440D-R can be utilized for remote readout of vibration level or as a transmitter to interface with customer computers, PLC's and other data handling systems. The Model 162VTR is a vibration transmitter only and is used where no trip function is required.

Accurate and Inexpensive Devices That Really Work. These state-of-the-art vibration switches are available at 1/2 to /3 the cost of other sophisticated vibration monitoring systems. And now, unreliable mechanical switches can be replaced with dependable electronic vibration switches that really work.

Important Features

• Sense and Trip on Vibration Severity (Velocity). Vibration severity (damage potential) is directly proportional to vibratory velocity. Also, international standards specify that velocity shall be used for measuring vibration severity.

  The different classes of machinery failure result in increased vibration at different frequencies (CPM) on a given machine. Therefore, it is important that the vibration protection device be equally sensitive to damaging vibration at all frequencies.

  In mechanical switches, sensing and tripping are inherently limited to acceleration. Since severity (damage potential) is proportional to velocity, acceleration tripping is oversensitive to some frequencies and not sensitive enough to others - with the results of either false trips in some cases or not enough protection in others.

• Built-in Time Delay. This important feature avoids shutdown due to transitory vibrations occurring during start-up. Built-in time delay also prevents triggering of the alarm or shutdown functions from transient increases in vibration level during normal running.

How Vibration Monitors Protect Your Machines

PMC/BETA vibration products sense the presence of excessive machine vibration. The major causes of machine failure are: imbalance of a rotating member (about 40% of the time), misalignment (15%), defective bearings (15%) and defective belts (15%).

PMC/BETA vibration switches and monitors respond to destructive vibration by actuating an alarm or shutting down your machine when the vibration trip level is exceeded, thus preventing catastrophic failures, extensive repairs and costly downtime.

In most cases, vibration monitoring can detect a problem long before damage is done. Small and gradual machine deterioration shows up as a significantly increased vibration. Early detection usually permits continued operation until a scheduled shutdown.

The development of the PMC/BETA line of vibration monitors makes available relatively low cost devices for local and remote control room monitoring with the benefits formerly found only in expensive machine protection systems. These benefits include velocity or displacement trip, built-in time delay, one or two trip limits, analog output for remote indication or computer interface.

16-Channel monitor provides data on vibration, temperature, rpm or other process parameters

Model 4000... Simultaneously displays bar graphs and digital data

The Model 4000 simultaneously displays 16 bar graphs of vibration, temperature or other process parameters, normalized as a percent of Alarm or Shutdown trip settings. Additionally, the actual numeric value of each parameter can be digitally presented in tabular form at the right of the bar graphs. This permits the overall condition of a machine, a group of machines or a process to be reviewed at a glance.

Acceleration, velocity and displacement signal conditioners are available for vibration sensing and display. For temperature sensing, thermocouple and RTD signal conditioners are offered. Plus, the Model 4000 will accept 4-20mA signals from any process transducer.

Alarm and Shutdown trips are individually programmable for each channel. Snapshots of all channels at time of first shutdown are retained in memory for later review. Thirteen assignable DPDT relays are included. These can be assigned to any channel or group of channels. Further, each channel provides a 4-20mA output for interface to a computer or other devices for data logging.

The Model 4000 requires only 12.25" x 8.7" of panel space. For added safety, it includes a battery-backed memory.