How is the shaft displacement of a compressor verified? There are several verification methods

It is recommended that your factory purchase a Bentley TK3-2E probe calibrator for calibrating the probes.

Instructions for using the Bentley TK3-2E probe calibrator: 1. Connect the calibration device. 2. Adjust the axial micrometer on the TK3 or the calibration instrument until its reading is 0.51 mm (20 mils). 3. Install the probe in the probe holder of TK3, and adjust the probe within the holder until the digital multimeter reads -3±0.10V DC. 4. Adjust the micrometer to 0.20 mm (8 mils), and then adjust it back to 0.25 mm (20 mils) to compensate for the mechanical clearance of the micrometer; record the output voltage. 5. Use a micrometer to increase the gap in increments of 0.25 mm (10 mil); after each increase in the gap, record the voltage value. 6. For each increase in voltage, the voltage corresponding to the smaller gap is subtracted from the voltage corresponding to the larger gap, and then the result is divided by 0.25 mm (10 mils); this yields the system’s incremental sensitivity (ISF) of 7.87±0.79 V/mm (200±20 mV/mil). 7. The average sensitivity (ASF) of the system is obtained by subtracting the voltage at 0.25 mm (10 mil) from the voltage at 2.28 mm (90 mil), and then dividing the result by 2.03 mm (80 mil); this yields an ASF of 7.87±0.43 V/mm (200±11 mV/mil).

Verification isn’t possible just by having verification equipment; it is necessary to establish relevant standards first through the provincial quality and technical supervision department before testing can be carried out

We generally use two methods: fixed voltage or fixed gap. Since the body monitoring system uses the VM600, fixed voltage is usually adopted; a voltage range of AC9.5V to AC10.2V between the probe and the measurement surface is considered reliable. If there is any movement of the main shaft, the fixed gap method is used, with a feeler gauge being used to set the gap at 0.75 mm before pushing it against the working surface. Depending on the manufacturer, this free gap varies between approximately 0.4 mm and 0.48 mm. After that, the fixed voltage method is used for zeroing. As for whether the probe and the preamplifier meet the requirements, they need to be sent to a provincial metrology testing center for inspection and certification