KYOWA DTK-A User manual

IM-T-277F Jul. 2021
DTK-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.

When changing the gauge head or screws, be sure to insert the
accessory pin(φ2×20)through the hole, located on the cable side of the
rod, to secure the rod in place. Or, the transducer will be damaged.
(Note)
Do not turn the gauge head while
holding the body.
 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.
 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 an immovable point as illustrated, using an M6 bolt
and the accessory plate, two M3 bolts. So, arrange the M6 bolt by yourself.
5.2 Initial unbalance with the rod fully extended is approximately -2.5 to -0.5
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 gauge head then fix to the
measuring point, using the M2.5 screw or the M2.5 screw which is on the
other end of the transducer.
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.
Pin(φ2×20)
Washer Spring washer
Rod
Gauge head ＮＧ！

9. Special accessories (optional)
Caution
 When changing the gauge head or screws, to prevent troubles, take care to
avoid excessive axial or bending force on the rod. To avoid torsion stress on
the displacement transducer, be sure to insert the accessory pin(φ2×20)
through the hole, located on the cable side of the rod, to secure the rod in
place. Hold the pin tightly while changing the gauge head or screws. (See
the figure in chapter 3.)
9.1 To attach a displacement probe or extension rod (option) to the transducer,
use the spring washer and plain washer attached to the transducer. Put the
plain washer on the transducer’s rod end so that the plain washer acts as a
stopper.
9.2 A displacement gauge head or extension rod (option) having been mounted,
the rod may exhibit poor response. Before measuring, check that the rod
responds properly.

How to attach a replacement probe

How to attach an extension rod
○ Ballpoint probe ○ Flat probe
X-1-DT XS-5-DT
○Spheric probe ○Spheric probe
XS-6-DT XS-105-DT
○ Flat probe
XS-2-DT
Note: Use XS-5-DT or XS-2-DT probes for a measuring object whose shape is
spherical.
○ Roller-equipped probe
SH-2-DT
○ Hook type probe
H-1-DT
○ Extension rod
○ Mounting Band
FXB-30B
Models φD L
EB-50 4 50
EB-100 5 100
SR1.2
(The sphere portion
does not rotate.)
SR7
SR4

Website : www.kyowa-ei.com
10. Dimensional drawing
Note: It is the size when attaching the attached mounting plate.
Models Mounting Plate (A) B C (D) (E)
DTK-A-30 DTK30-LP 140 31 85 14～45 71
DTK-A-50 DTK50-LP 196 51 120 14～65 106
11. Specifications
Models Rated capacity Frequency Response
Weight
(Approx.)
DTK-A-30 30 mm DC to approx. 10Hz 25 g
DTK-A-50 50 mm DC to approx. 6Hz 34 g
◆Performance
Rated Capacity See table above.
Nonlinearity Within ±0.3%RO
Hysteresis Within ±0.3%RO
Repeatability 0.3%RO or less
Repeatability 2.5 mV/V or more
◆Environmental Characteristics
Safe Temperature -10 to 70℃(Non-condensing)
Compensated Temperature 0 to 60℃ (Non-condensing)
Temperature Effect on Zero Within ±0.05%RO/℃
Temperature Effect on Output Within ±0.05%/℃
◆Electrical Characteristics
Safe Excitation 6V AC or DC
Recommended Excitation 1 to 5 VDC
Input Resistance 350 ±3%
Output Resistance 350 ±3%
Cable 4-conductor (0.08mm2) vinyl shielded
cable, 3.2mm diameter by 3m long,
terminated with a connector plug
(PRC03-12A10-7M)
(Shield wire is not connected to the
case.)
◆Mechanical Properties
Frequency Response See table above.
Measuring Force Approx. 2N
Weight See table above. (Excluding Cable)
Compliance Directive 2011/65/EU, (EU) 2015/863
(10 restricted substances) (RoHS)
[NOTE]
Products with CE Marking are compliant European RoHS Directive.
◆Accessories
Mounting Plate (DTK30-LP) 1 (for DTK-A-30) (Note)
Mounting Plate (DTK50-LP) 1 (for DTK-A-50) (Note)
Note: One Mounting Plate(DTK-LP) includes the following parts.
Mounting Plate 1
Rounded machine screw (M3×6) 1
Pin (φ2×20) 1
Probe (X-1-DT) 1(Note)
Protection tube 1(Note)
Note: It is attached to the product at delivery.
Test Data Sheet 1
Instruction manual 1 (This book)
◆Optional Accessories
Extension Rods EB-50,100
Mounting Plate DTK30,50-LP
Mounting Band FXB-30B
Replacement Probes X,XS,SH,H