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Shaft displacement sensor
It is a non-contact linear measurement tool. With long-term working reliability, wide measurement range, high sensitivity, high resolution, fast response, strong anti-interference, free of oil and other media, it is widely used in power, petroleum, chemical, metallurgical and other industries. Dynamic and static non-contact displacement measurement of large rotating machinery such as turbines, turbines, blowers, compressors, gear boxes, and large cooling pumps.
Such as: radial and axial shaft displacement, differential expansion, shaft eccentricity, shaft vibration, key phase, speed to meet the needs of various measurement programs, we provide a variety of specifications of the eddy current sensor, such as according to the probe specifications ( Diameter) can be divided into Φ8mm, Φ11mm, Φ25mm three specifications, according to the total length of the system cable (probe cable length + extension cable length) can be divided into 5m and 9m two types.
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The eddy current sensor consists of a probe and a preamplifier. The probe consists of a coil, a skeletal shell, a radio frequency cable, and a high frequency plug (see figure). The main function of the probe is the coil. The coil is excited by the high frequency signal from the preamplifier to generate a high frequency magnetic field. When the metal object to be measured approaches the coil L, eddy currents are generated on the metal surface due to the effect of high frequencies. Equivalent to a short-circuit coil, which will generate a magnetic field to resist changes in the high-frequency magnetic field. This process consumes energy, increases the inductance loss of the coil, reduces the Q value, and reduces the degree of the Q value between the plane of the coil and the surface of the measured object. Distance d, see Qd feature map.
From the block diagram of the front-end circuit, it can be seen that it is composed of a capacitor and a sensor coil in parallel to form an LC resonant tank. When the distance between the inductor and the measured object changes, the Q value of the inductor changes, so the LC oscillator outputs a voltage signal. After correction, a voltage signal that is linearly related to the displacement of the measured object can be obtained.
QBJ-3800XL series eddy current sensor is a non-contact linear measurement tool. With long-term working reliability, wide measurement range, high sensitivity, high resolution, fast response, strong anti-interference, free of oil and other media, it is widely used in power, petroleum, chemical, metallurgical and other industries. Dynamic and static non-contact displacement measurement of large rotating machinery such as turbines, turbines, blowers, compressors, gear boxes, and large cooling pumps.
Such as: radial and axial shaft displacement, differential expansion, shaft eccentricity, shaft vibration, key phase, speed to meet the needs of various measurement programs, we provide a variety of specifications of the eddy current sensor, such as according to the probe specifications ( Diameter) can be divided into Φ8mm, Φ11mm, Φ25mm three specifications, according to the total length of the system cable (probe cable length + extension cable length) can be divided into 5m and 9m two types.
Probe diameter ( mm ) 8 11 27.1
Static linear range ( mm ) 2 4 12.7
Static sensitivity ( V/mm) ≤ 1.0% 8 4 0.8
Static amplitude linearity ±2.0% ±5.0%
Dynamic amplitude linearity ±10%
Static zero error  0.5%
Static amplitude stability 0.5%
Dynamic Reference Sensitivity Error  3.0%
Static amplitude repeatability 1.0%
Frequency Response 0 to 5KHz (0.5dB)
System temperature drift  0.1%
Measuring range midpoint clearance ( mm) ±5% 1.8 3 9
Measurement range midpoint voltage (V) ± 5% -10 -10 -7.08
Test object material, shape Metal material, reference material for 45 steel, shaft, plane, on-axis measurement plate
The diameter of the shaft is not less than ( mm) 80 - -
Measuring plate diameter is not less than ( mm) 18 30 70
Power Supply Voltage ( V) -20~26Vdc
Power Consumption ( mA ) 12 12 15
Output load  10KΩ
Calibration ambient temperature ( 20±5 ) °C
storage
Temperature Controller -35 °C ~ +100 °C
Probe -40 °C ~ +177 °C
Cable -40 °C ~ +177 °C
use
Temperature Controller -30 °C ~ +70 °C
Probe -40 °C ~ +150 °C
Cable -40 °C ~ +150 °C
Total system weight (standard configuration) 500g±3% 700g±3%
System cable length ±10% 5 m or 9 m
Extension cable length ±5% 4 m, 4.5 m, 8 m, 8.5 m
Probe cable length ±5% 1 m, 0.5 m
Relative Humidity (With Submerged Protection)  100% Condensation
Altitude limit <2000m
Normal working environment No strong magnetic field, no corrosive vapor liquid, no strong vibration source
Hazardous Work Environment ( i series) II A~II C grade, T2~T5 Group gas mixtures in Zone 0, Zone 1, Zone 2 hazardous locations
Shell protection class not less than  IP20
The maximum surface temperature of the sensor housing must not exceed 135 °C.
Insulation Resistance > 500M Ω
Insulation strength > 500V
Eddy Current Sensor Model: QBJ-3800XL-A01
application
The φ8mm eddy current sensor is the most commonly used size. It can be used to perform non-contact vibration displacement measurements on all types of rotating machines. Its small size and abundant linear range make it ideal to use it to directly observe rotating surfaces. The φ8mm eddy current sensor described here is commonly referred to as relative vibration for measuring the vibration of the shaft.
Technical indicators
Frequency response: 0 ~ 3KHz
Sensitivity: 8V/mm
Linear range: 2mm
Working environment: front device temperature ≤ 65°C
Probe temperature ≤120°C
Measurement method: vertical, horizontal
Mounting thread: M10×1(mm)
The sensor is a non-contact linear measurement tool. It has the advantages of long-term working reliability, wide measuring range, high sensitivity, high resolution, fast response, strong anti-interference, and free from oil and other media. Therefore, it is widely used in on-line condition monitoring and fault diagnosis of large-scale rotating machinery.
DM6000 series eddy current sensor system is composed of independent 3mm;5mm;8mm;11mm;16mm;18mm;22mm;25mm;36mm;50mm;60mm and so on various probes, extension cables and preamplifiers.
The output of 20V/mm~0.32V/mm makes the linear range of the system reach 0.1~65mm. Due to this linear range, it can be widely used for vibration and displacement measurement of reciprocating and rotary machines. Smaller area effect and wider The frequency response can also be used for equal speed and key measurements. Excellent technical performance can directly replace imported similar products.
Probe parameter selection please refer to this page
Eddy current sensor specifications are:
-24VDC power supply,
-2-18VDC or -4-20VDC output;
+24VDC power supply,
4-20mA output, 1--5VDC output;
+-15VDC power supply,
0-5VDC,-5-+5VDC,-10-+10VDC output
QBJ-3800XL, 8300-A11-B90 Eddy Current Sensor/Axis Displacement Sensor
QBJ-3800XL, 8300-A11-B90 Eddy Current Sensor /