Photo (Electrostatic capacitance-type Gap Detectors VE series)

VE series are non-contact type of vibration/small displacement detector with high accuracy which can measure the distance between conductor such as metal and sensor’s surface in micron/submicron resolution. It demonstrates its best performance when used for the measurement and control of the axial and surface vibration of rotational shafts such as main shaft of turbines, electric motors, compressors, and of the thickness and width of moving objects. In addition to the measurement of the amount of displacement, a gap detector can also be used for a wide range of other measurement and control applications such as the measurement of the amount of slack or warping. The non-contact measurement process enables to apply no load to rotational or vibration body, and does not affect the material under measurement.

 

Five models of sensor are available including the VE-8020, which measurement range is 8mm and maximum at VE series. And also, no calibration is required in measurement of any conductive materials even though material change has been made. VE series are used in combination with the electrostatic capacitance-type non-contact displacement meter, VT-5200/5700 series and CL-5600 series.


Features

  • Not be affected by color, roughness, reflectivity, and light of measurement object.
  • The non-contact measurement process does not affect the material under measurement.
  • A simple structure provides excellent durability and it can be used under the wide-range conditions of usage.
  • No calibration is required in measurement of any conductive materials even though material change has been made. (In addition to metal, silicon, carbon and surface of water can be measured.)

Examples of measurement

Illustration (System configuration)

VE series are used in combination with the dedicated converter or electrostatic capacitance-type non-contact displacement meter, VT-5200/5700 series or CL-5600 series. Please be sure that an object can be measured and measurement accuracy depend on the converter or thickness meter. Refer to each product information page in detail.

* In order to keep the specified accuracy, the calibration has been performed for one-to-one each other of the sensor with the converter or the display unit before delivery. Recalibration is required if the sensor shall be replaced.

Objects can be measured

If the material of the object to be measured is a conductor, then it can be measured. There are several different types of conductors available as fellows

Metal plates Steel, aluminum, stainless steel, etc
Silicon Wafers Can be measured in the same way as metal plates.
Copper-foil laminated boards The thickness of both surfaces can be measured prior to etching.
Pastes Pastes such as battery pole plates prior to firing.
Carbon plates Plates which include a large amount of the carbon material used for gaskets, etc.

Objects that require care when they are measured

Alumite Aluminum plates which have undergone alumite processing have an insulating file on the surface which may cause unstable measurement.
Coated objects Objects coated with an insulating layer include errors in the measured values.
Round objects VE sensors operate on the premise that the object under measurement has a flat surface. If the surface is curved, measurement errors may occur.
Object with a rough surface If the surface is rough, the measured values will be smaller when compared to the values obtained when measurement is performed by a contact-type instrument. This instrument averages out the surface roughness. If the surface is very rough, there may be cases when measurement cannot be performed.
Spongy objects If the object under measurement is spongy, measurement may be smaller due to the open area ratio.

Measurement of insulators

Gap measurement can be performed when the target measurement object is an insulator such as plastic, sapphire, glass, plastic film and crystal if the insulator measurement function software (model CL-0300) is installed.

Specifications

Standard type

Model name VE-5010 VE-1020 VE-1520 VE-3020 VE-8020
Measurement range(μm)*2 0 to 500 0 to 1000 0 to 1500 0 to 3000 0 to 8000
Minimum diameter of target(mm)*3 φ6 φ8 φ10 φ20 φ40
Cable length (m) 1.5 (attached cable as standard) 1.5  (VL-1520 as sold separately) *1
Temperature function k1=1.7×10-5, k2=3.4×10-5
Operating temperature range *4 0 to +80°C

Clamp-shape type (common to Φ10mm)

Model name VE-2011 VE-5011 VE-1021 VE-3021
(Discontinued)
VE-8021
Measurement range(μm)*2 20 to 200 50 to 500 1000 to 1000 300 to 3000 8000 to 8000
Outer dimensions(mm)*3 φ3 φ6 φ8 φ20 φ40
Cable length (m) 1.5  (VL-1520/1521 as sold separately) *1
Temperature function k1=1.7×10-5, k2=3.4×10-5
Operating temperature range *4 0 to +80°C

Note:
*1: The VL-1520 signal cable is sold separately.
*2: The measurement range refers to the maximum gap between the surface of the sensor tip and the object under measurement.
*3: The surface measurement area of the object under measurement must be larger than the external diameter of the sensor.
*4: The operating temperature range is the temperature range in which the sensor can operate, not the operating range for which accuracy is
      guaranteed. The operating range for which accuracy is guaranteed at 23±2°C. The temperature characteristics of the VE series are shown in the
      formula below.

Revised:2010/12/01



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