I. LVDT displacement sensor four-wire system overview
Differential transformer displacement sensor (LVDT) has the characteristics of high precision, good dynamic characteristics, reliable operation and easy use. Ideal for high precision, high repeatability measurements in quality control and metrology applications. It can be widely used in aerospace, machinery, construction, textile, railway, coal, metallurgy, plastics, chemical industry and scientific research colleges and other industries of the national economy, used to measure elongation, vibration, object thickness, expansion and other high-tech products.
The LVDT displacement sensor four-wire system uses an integrated single-chip solution for outstanding performance. LVDT20 can be reduced by two thirds with the same range length, especially suitable for installation space is small occasions! The probe is made of silicon nitride ceramic with high hardness and wear-resistant material, and the moving part of the measuring shaft is made of precision guide rail. The displacement sensor is equipped with a transmitter that can output the standard DC signal. The four-wire transmitter uses a single power supply +9 ~ 36V DC isolated power supply. Can output signal 4-20mA, 0-5V,0-10V or ±5V,±10V and other signals to choose from.
II. LVDT displacement sensor characteristics
★ Measuring pen diameter Φ8mm, Φ15mm, Φ20mm to choose from
★ The probe is silicon nitride ceramic ball, good wear resistance
★ Measuring range from 0-100MM, high resolution, good repeatability
★ No sliding contact, long service life
★ Four-wire power supply isolation 4-20mA current output, 0-5V, 0-10V or ±5V, ±10V voltage output
III. LVDT displacement sensor application field
● Shaft diameter runout detection ● Textile machinery detection
● Valve position detection and control ● Roll gap measurement
● Vehicle brake device wear measurement ● Robot, precision displacement measurement
● Auto parts online testing ● Machine tool and tool positioning, hydraulic cylinder positioning
● Bridge floor shift detection ● Subway tunnel engineering protection
IV. Performance parameters
Displacement range | 2.5mm,5mm,10mm,15mm,20mm,25mm,40mm,50mm,100mm |
Output signal | 4～20mA，0～5V, 0～10V,±5V,±10V |
Resolution | 0.1um(The highest） Note: The larger the range, the lower the resolution |
Linear error | ≤±0.1%～±0.25%FS |
repetitive error | The highest can up to 1um Note: The smaller the range, the smaller the repetition error |
Power supply | +9～36VDC |
Working current | Current 30～80mA |
dynamic behaviour | Pull rod type 50Hz，Return type 20Hz |
Tolerance impact | 250g/11ms |
Vibration limit | 10g/2KHZ |
Excitation voltage | 3Vrms |
Excitation frequency | 2.5Khz |
Temperature coefficient | Zero end ≤0.01%/℃ |
Sensitivity | ≤0.025%/℃ |
Operating temperature | -25℃～+85℃ |
V. Model Selection
Color definition of four-wire signal output cable:
Red: - Power supply (+) Black: - Power supply (-)
Green - signal output + white - signal output -
The output voltage of the DC regulated power supply must be within the specified service range
Machine dimension
LVDT8 Pen size
Note 1: Dead zone must be excluded before measurement
Note 2: The outside diameter of the pen displacement sensor (LVDT) is 8mm. It does not have a circuit demodulator or transmitter inside itself. The external transmitter is connected by means of an aviation plug.
Measuring range | B(mm) | C(mm) | Anteroposterior dead zone(mm) |
2.5mm | 100 | 4.5 | 1 |
5mm | 100 | 7 | 1 |
10mm | 106 | 12 | 1 |
LVDT8 Stainless steel mounting bracket
Rebound dimensional drawing
Parameter Measuring range | LVDT20 Rebound series | |||||||
5 | 10 | 15 | 20 | 25 | 40 | 50 | 100 | |
Coil length B(mm) | 80 | 80 | 100 | 100 | 100 | 243 | 243 | 338 |
Length of rod exposed in free state C(mm） | 7 | 12 | 17 | 22 | 27 | 45 | 55 | 105 |
1 | 1 | 1 | 1 | 1 | 2.5 | 2.5 | 2.5 | |
Note: Be sure to exclude dead zone before measurement
Plastic mounting jig dimensions
Note: The positioning and installation of LVDT requires non-metal fixtures with low temperature expansion coefficient to be used for fixing. If metal blocks are used for installation, product performance will be affected.
The company has a standard fixture accessories for users to choose to use, users can also customize the installation fixture.
