IM-T-248b '08.11
BLW-A HOLLOWED LOAD CELL INSTRUCTION MANUAL
Thank you for purchasing BLW-A hollowed load cell. Before using
it, please read this instruction manual carefully. Also, keep the
manual within easy reach so that you can refer to it whenever
necessary.
1. Installation
1.1 The load cell is delivered with its load receiving upper and lower
surfaces coated with rust preventive paint. Before installing the
load cell, be sure to remove these coats using toluene or
acetone. If not, the coats will adversely affect the load cell’s
characteristics.
For caution’s sake, the load receiving upper and lower surfaces
have undergone grinding to ensure the high Load Cell’s
characteristics. Take care to keep the surfaces from damage.
Also be sure to form a protective coat of machine oil as rust
preventive paint on the loading surface each time the load cell
is set aside for after use.
1.2 The load cell is designed to detect a load affected on an
anchor. Set the load cell to the center of an anchor with care
not to have dust, sand, gravel particles trapped between the
load cell and the bearing plate.
When installing the load cell to a slant, take care that the
anchor will come to the center of the load cell by inserting
styrene foam or the like between the inside of the load cell and
the anchor.
1.3 The quality of load cell installation directly affects measurement
accuracy. Therefore, in order to avoid an aslant load or an
eccentric load, pay attention to the position and size of the load
cell installation, as possible.
1.4 Using a styrene foam plate or other, shade the load cell from
the direct rays of the sun.
1.5 In order to keep the load cell cable from deformation by
external forces and avoid external noise, take care to place it in
a steel pipe, etc. as much as possible.
1.6 Connect the load cell to a tester, and measure an insulation
resistance value.
1.7 Connect the load cell to an indicator, and measure an initial
unbalance value.
2.Handling Precautions
2.1 Check that the load cell’s manufacturing number agrees with the
test data sheet.
2.2 Check that the load cell’s insulation resistance is 100MΩor higher
between the main body and red to green of the cable. To measure
insulation resistance, apply a voltage lower than 50V to the
insulation resistance tester.
2.3 Using the tester, check that the load cell’s input / output resistance
are as follows.
Input resistance (between red and black wires) : approx. 350Ω
Output resistance (between white and green wires) : approx.350Ω
2.4 Avoid hitting or the other shocks on the load cell, or disconnection or
damage may occur. If shocks should be given to the load cell, its
performance stability may be adversely affected in long-term
continuous operation.
2.5 For transit, keep the load cell in its case. If it is carried by holding
the cable only, the cable may be damaged to cause disconnection
and / or deterioration of the insulation resistance. Measurement
may thus become impossible.
2.6 Do not disassemble the load cell.
2.7 Be sure to put the accessory cable cap on the end of the cable, and
to avoid water on the conductors.
2.8 Do not bend the cable extremely. Do not drop matters on it or tread
on it. (Keep the radius of curvature larger than 10cm when bending
the cable)
Fig.1 Installation for VSL stressbar anchor
