NOTES ON MEASUREMENTS USING NON-CONTACT EDDY CURRENT PICKUP
SHAFT
VIBRATION MEASUREMENT
The two
Non-contact pickups orthogonal to each other shall be mounted with supplied L
Brackets. These will look at the shaft with a gap. There is no need to have a
notch or elevation in the shaft. The air gap variation is converted to shaft
vibration by the pickup driver and shaft vibration card of IRD8800 monitor.
AXIAL
SHIFT / THRUST MEASUREMENT
The
Non-contact pick shall look at the end of the shaft and there shall be a gap.
The axial movement of the shaft will alter the gap and this will be read in the
Axial Thrust card of IRD8800.
PHASE
MEASUREMENT
The
Non-contact pickup shall look at a notch / depression / key way / elevation at
the shaft. In each rotation of shaft, the output voltage pulse change is sent
to the IRD8800 casing vibration card for phase measurement. The offered
Non-contact pickup is having a tip dia of 6mm the notch / key way width can be
9 to 10 mm. (>1.5 times tip dia)
A quick shop floor
method to create a notch is to take an available key and mount it on the shaft
with a good quality sticky tape. This shall not be a permanent arrangement but
often used for quick solutions.
Related Articles
How to connect a Loop Powered Vibration Sensor
Loop Powered Sensors run on a DC Voltage Supply. They are a 2 wired system on which both supply is given and output is observed. Typically, loop powered sensors such as IRD591 are loop powered by DCS/PLC/SCADA by a 24 V DC supply. The sensor then ...
Which Standard do we follow for Calibration of our Vibration Sensors
Vibration Sensors help measure the vibration of a rotary equipment. They come in a variety of choices with different profiles, construction, mounting options and outputs. Calibration of a Vibration Sensor is the process of checking whether or not the ...
Accuracy of Vibration Sensors
Vibration Sensors have an output proportional to underlying vibration. This output is reported in terms of its sensitivity. When someone uses an accelerometer that has an output or sensitivity of 100 mV/g, this means that the sensor is providing a ...
Mounting Options for Vibration Sensors - Accelerometers
The below figure shows the various options available for mounting of Vibration Sensors - Accelerometers
What is Sensitivity of an Accelerometer
An Accelerometer is a Sensor which has the ability to sense vibration acceleration. The SI unit of Acceleration is m/s^2. The Acceleration due to gravity is denoted as 'g'. The Acceleration due to gravity i.e 1 g is 9.81 m/s^2. Vibration Amplitude in ...