URL http://www.kyowa-ei.com
4. Connection
Caution
The cable tip of the product is assembled with the Lead-free solder. Be
sure to use the Lead-free solder (Sn96.5%, Ag3%, Cu0.5%) when
soldering the cable.
4.1 Connect the transducer to strain amplifier, using the accessory cable.
4.2 When using an NDIS connector (PRC03-12A10-7M), perform wiring as illustrated
below.
4.3 How to Connect When Using KYOWA’s Bridge Box
4.4 It is required to heat-run for 5 to 10 minutes before starting the measurement.
4.5 A shield wire is not attached to the LMA-A. If necessary, make grounding at the
amplified indicator. At this time, if inductive noise is generated, connect an
oscilloscope to the output terminal of the amplified indicator, and while observing
the waveform presented, perform suitable grounding. Note that grounding does not
always produce a good result.
4.6 Combining with measuring instrument, Measuring Method of Data Logger setting
CH mode (ex. UCAM-60B and UCAM-500) is "4-gage method (Strain gage
transducer) ".
Select the CH mode from "4-Gage (Constant voltage)".
5. Conversion
5.1 Use the rated output described in the Test Data Sheet to convent a reading into a
load value.
5.2 When a strain amplifier is in use, output reads in m/m equivalent strain (×10
-6
equivalent strain). Use the following equation to obtain a load value.
Load Value(N)
＝
Strain amplifier output ( m/m)
×
Rated Capacity (N)
Rated output (mV/V)
2000( m/m
／
mV/V)
5.3 When using an amplifier of other type or a recorder, first find the exact bridge
exciting voltage applied. The Test Data Sheet states the rated output caused by a
bridge excitation voltage of 1V. Use the following equation to obtain a load value.
Load Value(N)
＝
Bridge output voltage(mV)
×
Rated Capacity (N)
Bridge excitation voltage( V)
Rated output (mV/V)
Sensitivity Decrease due to Cable Extension
If a strain gage transducer is connected to a signal conditioner, digital indicator or
strain amplifier via extension cable, we cannot ignore the sensitivity decrease due to
the extension cable resistance which lowers the voltage applied to the transducer.
The rated output with lowered sensitivity can be obtained through the following
equation;
[
ε
0
] = [ R ] × [
ε
i
] ÷ [ R
＋
( r × L ) ]
R
:
Transducer’s input resistance (
)
r
:
Extension cable’s reciprocating resistance (
) per meter
L
:
Extension cable length (m)
ε
i
:
Rated output written in Test Data Sheet.
6. Maintenance and inspection
6.1 Avoid water, dust and oil on the end of the cable.
6.2 If a suspicious 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 for necessary inspection.
Caution
To measure insulation resistance, apply a voltage lower than 50V to the insulation
resistance tester.
7. Specifications
Model
Rated Capacity
Natural frequency
LMA-A-5N
5N (509.9gf)
Approx. 15.3kHz
LMA-A-10N
10N (1.020kgf)
Approx. 17.5kHz
LMA-A-20N
20N (2.039kgf)
Approx. 24.8kHz
LMA-A-50N
50N (5.099kgf)
Approx. 32.6kHz
LMA-A-100N
100N (10.20kgf)
Approx. 21.6kHz
LMA-A-200N
200N (20.39kgf)
Approx. 29.7kHz
LMA-A-500N
500N (50.99kgf)
Approx. 43.9kHz
LMA-A-1KN
1kN (102.0kgf)
Approx. 53.0kHz
NOTE:
The units and numerical values in parentheses in the rated capacity
column depend on the conventional unit expression just for reference.
Safe Overload Rating 150
％
Rated output 0.6 to 2mV/V(1200 to 4000 m/m) [5N]
0.75 to 2mV/V(1500 to 4000 m/m) [10N to 1KN]
Nonlinearity Within ±1%RO
Hysteresis Within ±1%RO
Recommended excitation voltage 1 to 5V AC or DC
Safe excitation voltage 7V AC or DC
Input resistance 350 ±2.5%
Output resistance 350 ±2.5%
Repeatability 1%RO MAX
Compensated temperature range 0 to 50
℃
(noncondensing)
Safe temperature range
−
10 to 60
℃
(noncondensing)
Temperature effect on Zero balance Within ±0.3%RO/
℃
[5N]
Within ±0.2%RO/
℃
[10N to 50N]
Within ±0.05%RO/
℃
[100N to 1KN]
Temperature effect on output Within ±0.2%/
℃
[5N to 50N]
Within ±0.05%/
℃
[100N to 1KN]
Cable 4-conductor (0.035mm
2
) vinyl shielded cable,
1.7mm diameter by 2m long, bared at the tip
(Shield wire is not connected to mainframe)
Weight Approx. 1.5 g (cable not included) [5N to 50N]
Approx. 11 g (cable not included) [100N to 1KN]
Accessories Instruction manual 1
Test Data Sheet 1
Warranty
1
RoHS Directive 2011/65/EU
Harmonised standards EN50581:2012
Transducer
