Vibration Sensors
Product Details
CMCP Eddy Probe Mounting Accessories
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An eddy probe system consists of a probe, matched extension cable, and driver (oscillator demodulator). The tip of the probe contains an encapsulated wire coil which radiates the driver's high frequency as a magnetic field. When a conductive surface comes into close proximity to the probe tip, eddy currents are generated on the target surface decreasing the magnetic field strength, leading to a decrease in the driver's DC output. This DC output is usually 200mV/mil or in a similar range. This signal is then sent to a CMCP-500 Series Transmitter or Monitor for conversion into a 4-20 mA output relative to displacement (CMCP-540 and 540A) or position (CMCP-545 and 545A). The CMCP-540A and CMCP-545A Monitors allow programmable alert and danger alarms with relays for the eddy probe driver's signal.
How Eddy Probes Work:
Frequency considerations also exist with eddy probes. While eddy probes have no lower frequency limit, very high frequencies become a problem. An eddy probe senses displacement, and at high frequencies displacement is often quite small requiring the use of a seismic accelerometer.
Often seismic transducers are not the best sensor for monitoring vibration on specific machines. Eddy probes offer a solution to most of the problems inhibiting the use of traditional seismic sensors. The most common use of eddy current probes is for journal type bearings. Journal bearings behave different than rolling element bearings in that they do not transmit the vibration of the shaft into the bearing cap due to the damping properties of this type of bearing. Another application for eddy probes, is where a high case to rotor weight ratio exists (turbines and compressors). In these applications most of the shaft's vibration energy is dissipated as displacement, which can only be measured by shaft relative motion.
Applications:
5, 8 and 19 mm probes
80, 90, 160 or 300 mil ranges
Non-Contact Vibration Displacement Measurement
Features:
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