IM-T-226G Jul. 2021
DTH-A Small-size Displacement Transducer INSTRUCTION MANUAL
Thank you for purchasing this KYOWA product. Before using it,
please read this instruction manual carefully. Also, keep the manual
within easy reach so that you can refer to whenever necessary.
Specifications and dimensions described in this manual could
be changed without notice. Please visit our website for the
latest version.
1. Calling the operator's attention
The following cautionary symbols and headlines are used to invite the
operator’s attention. Be sure to observe the accompanying
precautions in order to safeguard the operator and preserve the
performance of the instrument.
Warning
Improper operation of the system may result in
severe injury of the operator.
Caution
Cautions are given to invite the operator’s
attention, in order to avoid instrument failure or
mal-function.
2. Important notice
Unless specified, strain-gage transducers must not be used under
hydrogen environment.
3. Safety precautions
Warning
As you push the rod inward, the rod returns to its initial position by
reaction force. Handle the product with care to avoid eye poking.
4. Handling precaution
Caution
Do not apply excessive axial or bending force on the rod.
Do not disassemble the product.
Do not use the product under water and dusty environment.
Avoid usage in vibration.
Pay similar attentions toward the product as one gives to regular
dial gages.
Always keep the rod clean.
The transducer cannot be used to measure dynamic phenomena
whose rise tome is over 2Hz.
Make sure that the bending radius of cable is longer than 10
times of a diameter of the cable.
5. Installation
5.1
Fix the transducer to the steady point by using an accessory
mounting band, M6 rounded machine screw, plain washers and
wing bolt.
5.2
Initial unbalance with the rod fully extended is approximately -3 to
-2.5 mV/V.
5.3
Make sure the displacement of about 0.3 mm is applied to the
transducer.
5.4
Same as other dial gauges, the probe is made to contact the
measuring point for measuring. However, when a measuring
dynamic phenomenon, that the rod may fail to respond to it on
occasion. So make sure before measuring that it can respond.
5.5
To fix the rod to the measuring point, remove the probe and fix
the rod to the measuring point by using a screw (M2.5).
6. Connection
6.1
Connect the transducer to a measuring instrument.
6.2
When using a measuring instrument other than KYOWA,
connector plug as follows.
6.3
After the power ON, always preheat the product for
approximately 5 to 10 minutes.
7. Conversion
7.1
Use the calibration constant described on the Test Data Sheet to
convert a measured value into a displacement value.
7.2
When a strain amplifier is in use, output reads in ×10
-6
equivalent
strain. Find a displacement value corresponding to ×10
-6
strain.
Then, obtain a displacement value through multiplication using
the following equation.
Displacement (mm)
＝
Strain amplifier’s output (
×
10
-6
strain)
x Calibration constant (mm
／
1
×
10
-6
strain)
7.3
When using an amplifier of other type or a recorder, first find the
exact bridge exciting voltage applied. Second, find the
displacement value that corresponds to 1(μV) output voltage
against 1(V) bridge excitation voltage. Then, obtain the
displacement value through multiplication using the following
equation.
Displacement (mm) =
Bridge output voltage (μV)
×Calibration constant (mm
／
1μV/V)
Bridge excitation voltage (V)
8. Storage precautions and inspection
8.1
Avoid water, dust and oil from the product.
8.2
For storage, be sure to put the accessory protection tube on the
rod.
8.3
Recommend calibrate the product once a year or so. (Contact
your KYOWA representative.)
8.4
If an abnormal initial value or reading appears, measure input
resistance, output resistance as well as insulation resistance
(which should be 100M or higher).
If abnormal resistance is found, the cause may be failure of the
sensing element. In this case, contact your KYOWA
representative.
Caution
To measure insulation resistance, apply a voltage lower than 50V
to the insulation resistance tester.
Wing bolt
Rod
Probe
M6 screw
Mounting band
Steady point
Measuring
point
