KYOWA LMA-A Instruction Manual

LMA-A Small Compression Load Cell INSTRUCTION MANUAL
Thank you for purchasing the KYOWA product. Before using it, 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.
Improper handling may cause serious injury to the
Warning
operator.
Cautions are given to invite the operator's attention, in
Caution
order to avoid instrument failure or mal-function.
2. Important notice
Unless specified, the transducer must not be used under hydrogen
environment.
3. Safety precautions
Caution
Avoid water and rain.
The LMA-A is designed to detect only the load applied to the center axis. Its
installation may directly affect measurement accuracy. Therefore, carefully install
the LMA-A, thereby avoiding a slant load, lateral load, bending moment, etc.
The compensated temperature range of the LMA-A sufficiently covers daily
atmospheric temperature changes. Partial exposure to direct heat, however, must
be avoided. If not, transient output change may occur resulting in deterioration of
measuring accuracy.
If an ambient temperature unavoidably exceeds the allowable temperature range,
protect the whole LMA-A with heat insulation material in order to maintain a
temperature within the compensated temperature range.
When impacts or vibrations are applied to the direction of a load, the dynamic load
shall be static load × acceleration. If the magnitude of acceleration is not known,
rated capacity should be sufficiently large considering the dynamic load applied on
the LMA-A.
Do not disassemble the LMA-A.
Do not apply shocks to or drop matters on the LMA-A.
Calibration is necessary whenever the LMA-A is subjected to an excessive
horizontal force component or an excessive load.
In case abnormal output value is displayed, immediately stop the measurement. If
the LMA-A is used in the system, immediately stop the system operation.
Wire the cable with a little slack not to be pulled during use. Drawing strength of
cable in 20N (approx.2kgf).
The LMA-A is in a structure with a strain
gage bonded on the upper diaphragm as
shown in the figure below. Because the
diaphragm is very thin, carefully handle it
to avoid damage.
In vibration environment, fix the cable at its outlet and required portions. Or, the
cable may vibrate due to continuous load and cable may break and cause damage
to the LMA-A.
Make sure that the bending radius of cable is longer than 6 times of a diameter of
the cable.
4. Mounting
4.1 Dimensional drawing
LMA-A-5N to 50N
Diaphragm
Strain gages
LMA-A-100N to 1KN
4.2
Use CC-33A adhesive to bond the load cell
(a) Remove grease and dirt from the mounting portion with acetone, methylene
chloride, etc. If any rust, polish with sandpaper grit 120 and the like.
(b) Apply a little drop of CC-33A as shown in the following figure and quickly spread a
thin film on the bonding portion with a match head, etc.
(c) Gently press and hold the LMA-A with fingers,
etc. Since diaphragm is very thin, hold only
its circumference with fingertips and do not
press the center and its vicinity.
(d) When using other adhesive, also observe
precautions.
(e) When removing, insert a keen-edge cutter knife, etc. between the bottom face of
the LMA-A and the cement position.
Take care not to be hurt with the knives.
Caution
Do not forcedly insert a screwdriver to the circumference of the LMA-A bottom face
or the mount may come off.
Please use a
cutter knife to
remove.
○
4.3
Providing a mount hole
φ Ｄ 5N to 50N : φ12.2 or higher
100N to 1KN : φ20.2 or higher
4.4
How to use the mounting base
Attach as shown using the optional mounting base CFM.
Mounting method using the CFM-5A
NOTE: Cross recessed pan head screw in the figure are included with each
mounting base.
4.5
Measuring object
It is recommended to apply load through metals and rigid materials to have an
accurate measurement.
IM-T-101Y Jun. 2021
LMA-A
CC-33A
Bonding Portion
Warning
Do not
forcedly insert
a screwdriver
or the mount
may come off.
×
Mounting method using the CFM-100A
Rigid substance, metal or the like with
hardness HRC30 to 38
Hold with
Fingertips