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Electrostatic capacitance-type Gap Detectors
VE Series |
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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
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Not be affected by color, roughness,
reflectivity, and light of measurement object.
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The non-contact measurement process does
not affect the material under measurement.
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A simple structure provides excellent
durability and it can be used under the wide-range
conditions of usage.
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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
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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.
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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.。
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■ Metal plates |
Steel, aluminum, stainless steel, etc |
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■ Silicon Wafers |
Can be measured in the same way as metal plates. |
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■ Copper-foil laminated
boards |
The thickness of both surfaces can be measured prior to
etching. |
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■ Pastes |
Pastes such as battery pole plates prior to firing. |
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■ Carbon plates |
Plates which include a large amount of the carbon
material used for gaskets, etc. |
Objects that require care when they are measured
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■ Alumite |
Aluminum plates which have undergone alumite processing
have an insulating file on the surface which may cause
unstable measurement. |
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■ Coated objects |
Objects coated with an insulating layer include errors
in the measured values. |
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■ 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. |
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■ 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. |
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■ 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
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Model name |
VE-5010 |
VE-1020 |
VE-1520 |
VE-3020 |
VE-8020 |
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Measurement range（μm）*2 |
0 to
500 |
0 to
1000 |
0 to
1500 |
0 to
3000 |
0 to
8000 |
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Minimum diameter of target（mm）*3 |
φ6 |
φ8 |
φ10 |
φ20 |
φ40 |
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Cable length (m) |
1.5 (attached cable as standard) |
1.5 (VL-1520 as sold separately) *1 |
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Temperature function |
k1＝1.7×10-5, k2＝3.4×10-5 |
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Operating temperature range
*4 |
0 to +80ºC |
■ Clamp-shape type (common to Φ10mm)
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Model name |
VE-2011 |
VE-5011 |
VE-1021 |
VE-3021 |
VE-8021 |
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Measurement range（μm）*2 |
20 to
200 |
50 to
500 |
1000
to 1000 |
300
to 3000 |
8000
to 8000 |
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Outer dimensions（mm）*3 |
φ3 |
φ6 |
φ8 |
φ20 |
φ40 |
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Cable length (m) |
1.5 (VL-1520/1521 as sold separately) *1 |
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Temperature function |
k1＝1.7×10-5, k2＝3.4×10-5 |
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Operating temperature range
*4 |
0 to +80ºC |
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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±2ºC. The temperature
characteristics of the VE series are shown in the
formula below. |
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Revised: 2010/12/01
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