1. Principle The non-contact eddy current displacement sensor is based on the “eddy current effect†of a high-frequency magnetic field on a metal surface, and is an ideal sensor for detecting and controlling mechanical quantities such as displacement, vibration, and rotational speed of metal objects. It has obvious advantages such as non-contact measurement, wide linear range, high sensitivity, strong anti-interference ability, no medium influence, stable and reliable, easy to handle, etc. It is widely used in metallurgy, chemical industry, aerospace and other industries, but also for scientific research and school experiments Detection of mechanical quantities such as displacement, vibration, speed, length, thickness, surface unevenness, etc. At present, our company produces two types of eddy current sensors: displacement, vibration sensors and speed sensors. 2. MLW3300 displacement and vibration sensor 1. Range: ± 250μ. m—— ± 20mm 2. Linear error: 0.5% ~ 3.5% 3. Resolution: 0.05% (static) and 0.1% (dynamic). 4. Frequency response: 0 ~ 10KHz (0 ~ 2KHz, ≤0.5%, 2 ~ 10KHz ≤1%) 5. Working temperature: ―20 ℃ ～ 100 ℃ (normal temperature) ―40 ℃ ～ 160 ℃ (high temperature) 6. Temperature drift: 0.08% / ℃ (FS) 7. Probe outer diameter: Ф6 ~ Ф65 (mm) 8. Installation part size: a: M10 × 1 × 50. (Range≤2mm) b: Ñ„13 × 50. (Range≤15mm) c: Ñ„18 × 50. (Range> 15mm) (Note: Tailstock can be customized according to user requirements) 3. HR2000 pre-converter The models of pre-converters are divided into: 1. Signal output: a: Non-standard voltage output, (BZF-â… ) b: 0 ~~ ± 2V, 0 ~~ ± 5V, 0 ~ 10V. (BZF-â…¡) C: 4 ～ 20mA. (BZF―Ⅲ) 2. Power supply: a: ± 15 ～ 24V (BZFâ€•â… , BZF―Ⅱ) b: ―20 ～ 30V (BZF―Ⅲ) (Users can choose our company special ZY-A power supply) 3. Wiring: Four-core aviation plug â‘ negative power supply, â‘¡positive power supply, â‘¢signal output, â‘£public ground (4-20mA output â‘¡pin is empty) 4. Working temperature: 0 ℃ ～ 65 ℃ 5. There is a fault-tolerant device, which will not be burnt due to the wrong power supply. Fourth, the connection and calibration of the displacement sensor 1. Connection of sensor and pre-converter â‘ Connect by high-frequency cable, the standard length is 3 meters. â‘¡ The maximum length can be extended to 9 meters, which needs to be explained when ordering. 2. Calibration of sensor and pre-converter â‘ Environment: room temperature 20 ± 5 ℃ â‘¡ Material: 45 ﹟ steel (user can specify the material to be tested) â‘¢ Equipment: static calibrator 0-25mm ± 0.005 (Users can choose our company's static calibrator to calibrate by themselves.) â‘£, static calibrator: The static calibrator is customized by a high-precision micrometer and a special bracket. It is used for the static calibration and calibration of the sensor to obtain the input-output characteristic curve of the sensor. Standard output. The relative distance between the sensor and the measured body can be adjusted by adjusting the nut, and the static calibration or calibration of the displacement can be performed with a micrometer. ⑤ Calibration method Place the sensor on the chuck of the static calibrator and place the test piece on the test piece bracket. The test piece must be selected according to the actual material and shape of the test body. The four-core connector of the pre-converter is connected to the power supply and digital Connect the multimeter correctly and turn on the power to make the pre-converter work normally. Change the adjustment nut of the static calibrator to make the sensor slightly contact with the test piece, adjust the "full scale" potentiometer to a smaller position, and then adjust the micrometer according to the lower limit point of the linear range provided in the output characteristic table of each sensor , Change the distance between the sensor and the test piece, and then adjust the "zero" potentiometer so that the lower limit output of the converter reads "0V" (if it is ± 5V output, adjust it to -5V) and then change the micrometer to linear Adjust the "full scale" potentiometer of the upper limit point of the segment so that the output reading of the upper limit point of the converter is "5V". Change the micrometer to the midpoint of the linear segment to see if the output reading is "2.5V" (or 0V). If it is just right, it means that the sensor is basically calibrated. If it is found that the voltage reading at the midpoint is greater than "2.5V" (or less than "2.5V"), and the output of ± 5V depends on whether it is greater than 0V (or less than 0V), then move the lower limit point closer to the test piece ( Or away). Then repeat the above method to continue calibration. The output readings corresponding to the three points of the lower limit point δ1, the middle point δ0 and the upper limit point δ2 are linear, and meet the accuracy. Once corrected, its "zero" and "full scale" potentiometers should not be moved anymore to ensure accurate measurement. "Zero" and "full-scale" potentiometers must be adjusted several times to reach the best state. 6. Installation of the sensor After making sure that the sensor has been calibrated. Remove the sensor, together with the multimeter and power supply, install it to the actual test Body. Adjust the distance between the sensor and the measured object, so that the output reading of the converter meets the detection requirements. Generally speaking, (take “0-5V†output as an example) to measure vibration, the output indication should be “2.5V†which is the midpoint of the linear segment. Measure displacement, if the displacement of the measured body is bidirectional, the output indication should be "2.5V" which is the midpoint of the linear segment. If it is unidirectional, the output indication should be "0V" or "5V". That is the lower limit or upper limit of the linear segment. After the installation is correct, the sensor can be fixed. The installation of the speed sensor is relatively simple, as long as the front end face of the sensor is aligned with the sampling hole or sampling tooth of the rotating shaft to be measured The wheel maintains a gap of 2 to 3 mm, and the sensor can be fixed. 7. Application 1. Used for the detection of metal materials, such as: â‘ , movement, position, displacement, expansion, size â‘¡, vibration, offset, gap, resonance â‘¢, bearing vibration, lubrication clearance, wear, offset â‘£, commutator out of roundness, roundness, air gap, indexing ⑤, compressor, turbine clearance, speed â‘¥, impact, deformation, axial axis vibration 2. Used for the measurement and monitoring of the speed of the mechanical shaft 8. Matters needing attention 1. The connection is correct. After connecting the power, please warm up for 10 minutes. 2. There should be no other metal materials around the probe at twice the diameter of the probe. 3. When working, avoid the interference of strong magnetic field and strong electric field. 4. When the plug and socket between the sensor and the pre-converter are working, there should be no jitter to avoid output changes. 5. The length of the high-frequency cable cannot be increased or decreased at will. 6. For sensors without temperature compensation, the temperature of the measurement environment must not change sharply to improve the measurement accuracy. 7. If there is any problem during use, please contact the factory directly. Silver-zinc Rechargeable Battery Silver Zinc Rechargeable Battery,Battery For Aircraft Standby Power,Professonal Silver Zinc Battery,22.5V 45Ah Silver Zinc Battery Henan Xintaihang Power Source Co.,Ltd , https://www.taihangbattery.com