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VIBRATION MONITORING SYSTEM - VIBRATION TRANSMITTER

Definition

Vibration Transmitters convert input data from one or more sensors into a standard signal. The sensor may be discrete, such as an accelerometer, shaft displacement sensor & RTD - (Resistance Temperature Detectors).

Vibration Transmitters form an important part of a vibration measurement system. Such systems are used to predict and diagnose "machine health" by detecting abnormal vibrations during operation. Through early detection of such abnormalities, plant staff can schedule a suitable repair instead of dealing with the loss of time and efficiency caused by an unexpected catastrophic machine failure.

For example, vibration transmitters may be used to sense shaft misalignment by measuring vibration with help of Proximity Sensor (Shaft Displacement Sensor). Shaft misalignment occurs when rotating machinery shafts become misaligned due to movement that results from the operation of the machine at less than optimal conditions. When shafts become misaligned, forces on the machine produce stress on various components, causing abnormal vibration.

Overview

Vibration Transmitters commonly use current loop output, an analog signal which is compatible with most meters and data analyzers. Current loop transmitters typically operate over the 4-20 mA or 10-50 mA range. A 4-20 mA loop establishes a 4 mA output as "off" (in this case "no vibration") and 20 mA as "maximum load." When no vibration is detected, the transmitter transmits a constant 4 mA current. When a vibration sensor or accelerometer detects vibration, it relays the vibration reading to the transmitter, which then alters its output to a current value proportional to the vibration reading it received.

Features

Field Configurable for Acceleration, Velocity or Displacement range

Single / Dual Channel

Independent Alarms / Trip settings

RS485 Serial Modbus Interface

Output - 4xRelays, 2x4-20mA Isolated, Averaging, Hysteresis, Alarm / Trip delay

Field / Panel mount transmitter

Input - Accelerometer / Velometer / Eddy – Current probe

Fully Programmable (Micro-processor based)

Applications

Pumps

Motors

Gear Boxes

Blowers

ID/ FD/ PA Fans

Cooling Towers

Air Compressors

Conveyors

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