Here we are going to discuss the Characteristic Check of the Proximity Transducer Probe, you will also related topics to vibration in this article with links.
Proximity Transducer Probe Requirements
Following equipments required for the calibration checks for proximity transducer probe are;
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- Spindle Micrometer.
- Digital Multimeter.
- Power Supply.
- The probe system calibrated for one material should not be used with another material and it is always better to check the calibration of probe with its own proximeter.
Proximity Transducer Probe Procedure
- Install the probe in spindle micrometer, assuring the probe extends completely through the spindle micrometer-mounting fixture.
- Connect the probe to proximeter with proper length.
- Connect the power supply with -24VDC between VDC & COM terminals on the proximeter.
- Connect the digital multimeter between the output & COM terminals on the proximeter.
- Set the spindle micrometer to O mils (0 millimeter) and adjust the probe position in the mounting fixture until the probe face just touches the target. The multimeter should indicate O volts.
- j) Set the spindle micrometer to 0.2 mm. read the proximeter output voltage.
- Measure & record the output voltage from the proximeter at each 0.2 mm increment and fill the following form.
- In the last, calculate the response sensitivity with the formula given below;
Please also read: INSTALLATION OF TRANSDUCER PROBE AXIAL AND RADIAL VIBRATION PROBE
CALIBRATION FORM PROXIMITY PROBE
Machine No. Test equipment used
Tag No. Date of calibration
Probe Model. Proximitor Model Probe Serial No. Proximitor Sr. No.
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Gap mm
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Volts
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Difference
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Remarks
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0.2
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Calibrated with Proximitor Model
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0.4
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Calibrated with Proximitor Serial
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0.6
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Voltage at 2 mm
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0.8
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Voltage at 1 mm
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1.0
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Calculated V / mm
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1.2
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V / mm X 25.4 ( get mV / mil)
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1.4
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Linearity
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Accept/ Reject
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1.6
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Probe to be
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Installed/ Rejected
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1.8
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2.0
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Installation Record
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Gap Voltage set at Proximitor
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Axial Float on dial indicator
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Axial Float by Proximitor
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Axial Float shown in Control room
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Please read also: Compressor overview as instrument engineer
Formula using for Proximity Transducer Probe
Value (Volts) at 2 mm Value= Volts (X2)
Value (Volts) at I mm = Volts (XI) V/mm
Difference V/mm = V/mmTo convert this v/mm into mv/mils we need to multiply with 25.4
Difference V/mm = V/mmTo convert this v/mm into mv/mils we need to multiply with 25.4
So response = (X2-Xl) x 25.4 mv/mils
= mv/mils.Note; ideally it is 200 mv/mils ± 5 % tolerance.
= mv/mils.Note; ideally it is 200 mv/mils ± 5 % tolerance.
Please comment to our article if any suggestion regarding this.
Value (Volts) at 2 mm Value= Volts (X2)
Value (Volts) at I mm = Volts (XI) V/mm
Can you please know us what is X2 & X1