IM-T-293C
Jul. 2021
LCH/LUH-F High Accuracy Load Cells INSTRUCTION MANUAL
Thank you for purchasing this KYOWA product. Before using it, read this
instruction manual carefully. Also, keep the manual within easy reach so that
you can refer to it whenever necessary.
Specifications described in this manual could be changed without notice.
Please visit our website for the dimensions and latest version specifications.
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 handling may cause serious injury to the
operator.
Caution
Improper handling may cause deleterious effects to
the operator's body.
Caution
Cautions are given to invite the operator’s attention,
in order to avoid instrument failure or mal-function.
2. Important notice
Unless specified, the transducers must not be used under hydrogen
environment.
3. Safety precautions
Caution
Do not use the "special accessories" with load cells other than KYOWA.
3.1
Tension load cells
Use special accessories assembled and incorporated into the load cell
by KYOWA.
Warning
Avoid loads in excess of the rated load capacity, or the load cell may
rupture.
Provide a safety device to prevent the load cell installation from falling.
Improper locking of the connections may result in disconnection and
falling of the load cell installation.
To use in combination with the "special accessories for tension load
cells", be sure to properly lock all connections beforehand.
Loose setscrews and nuts may cause disconnection and falling of the
load cell installation. Before starting operation check that the setscrews
are tight, in order to prevent the load cell installation from falling. If the
setscrews are found loose, apply screw lock agent then tighten, or
contact your KYOWA representative.
3.2
Compression load cells
Caution
A load cell which is fixed insufficiently may slip when exposed to a
lateral load.
The top of a load cell may collapse when exposed to an excessive load.
4. Handling precautions
Caution
Using toluene or acetone, remove the rustproof galvanized coats from
the bottom and top of the load cell, respectively.
The load cell is designed to detect a force applied to the center axis
only. The quality of load cell installation directly affects measurement
accuracy. Therefore, carefully install the load cell, thereby avoiding
aslant load, rotational moment, horizontal force component and
bending moment.
The compensated temperature range of the load cell sufficiently covers
daily atmospheric temperature changes. Partial exposure to direct heat,
however, must be avoided. If not, transient phenomena may occur
resulting in deterioration of measuring accuracy. If an ambient
temperature unavoidably exceeds the compensated temperature
range, protect the whole load cell 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 transducer.
Do not disassemble the load cell.
Avoid shocks or matters falling onto the Load Cell.
Whenever the load cell was subjected to an excessive horizontal force
component or load, it must be calibrated.
Do not carry the load cell by holding its cable, and do not pull the cable
forcibly to avoid the cable coming off.
In vibration environment, fix the cable at its outlet and required portions.
Make sure that the bending radius of cable is longer than 6 times of a
diameter of the cable.
5. Mounting
5.1
Measurement of a compression load
Install the load cell as illustrated by the sketch below. It presents a typical
mounting example intended for high accuracy of measurement.
