KYOWA BER-A-17S Instruction Manual

BER-A-17S Wall-surface Soil Pressure Transducer
Thank you for purchasing BER-A-17S Wall-surface Soil Pressure
Transducer.
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.
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.
Cautions are given to invite the operator's attention,
Caution
in order to avoid instrument failure or mal-function.
Be sure to observe the accompanying instructions.
2.
Safety precautions
Caution
Be sure to use the BER-A-17S in a wall-mounted state. Do not bury the
BER-A-17S for measuring underground pressure. Since the
BER-A-17S does not satisfying the shape factor (thickness to diameter
ratio: 1/5) for measuring underground pressure, precise measurements
cannot be performed.
Barometric pressure and temperature affect the Zero point of the
BER-A-17S. The amount of change in barometric pressure equals that
of the Zero point. You can compensate the Zero point by measuring
barometric pressure. For long-term continuous measurements, we
recommend you to compensate the barometric pressure. (1hPa =
0.00102 kgf/cm )
2
Avoid pressure and impact beyond the max. load (As for the numerical
value, 7 refers to the list of specifications) rating on the pressure
sensing diaphragm. If not, residual stress will occur to alter
measurements largely, and measuring will thus fail.
Always pack the BER-A-17S in a cardboard box for transportation. Do
not drop, hit, or apply any impact to the BER-A-17S.
Do not turn the fastening ground of the cable outlet. Or, waterproof seal
performance of the cable may be affected to cause insulation failure.
Do not hang the BER-A-17S by holding the cable. Always hold its main
body.
Do not drop any matters on the cable or step on the cable. Even if the
cable appearance is observed normal, conductor wires inside the cable
may be damaged.
Do not apply tension to the cable.
Do not excessively bend the cable. Take care and keep the minimum
radius of the cable curvature more than 10 cm.
Take special care for fixing and protecting the cable after installing the
BER-A-17S.
3.
Mounting
3.1 When installing the BER-A-17S, drill a hole having 31 mm in inner
diameter on the wall as shown in the attached 8.outside drawing.
Prepare a fixture to make the sensing diaphragm have the same level
with the mounting wall surface. Finish the surface sealed with O-ring
to have the finish level about No. '▽▽▽.'
3.2 Firstly, weld only the fixture to the entire periphery of the mounting wall
surface. (Sufficiently tight enough not to allow the water leak when the
water pressure is applied.) Do not weld the fixture with the BER-A-17S
mounted.
3.3 Apply the attached vacuum grease to the accessory O-ring. Install the
accessory O-ring (P-36) to the BER-A-17S. Make sure there are no
foreign objects (dust or sand) on the surface. Install them into the hole
on the wall.
3.4 Firmly fix the BER-A-17S to the fixture with commercially available
hexagon socket head bolts (M10). Hexagon socket head bolts and
wrench should be prepared on the customer's side.
INSTRUCTION MANUAL
3.5 While tightening the fastening bolt, connect the cable to a static
strainmeter and check whether the Zero point does not largely
change.
3.6 After installing the BER-A-17S, check the zero point is stable with a
static strainmeter. Due to a temperature difference between the
ambient temperature and BER-A-17S, touched for the installation,
some BER-A-17S units are unstable. At this time, take sufficient time
for stabilization.
4.
Connection
4.1 Connect the transducer to strain amplifier.
4.2 When using an NDIS connector (PRC03-12A10-7M) , perform wiring
as illustrated below.
BER-A-12S
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 connected to the mainframe. 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.
5.
Conversion
5.1
Use the calibration constant described in the test data sheet to
convent a reading into pressure.
5.2 When a strain amplifier is in use, output reads in m/m equivalent
strain (×10 equivalent strain). Find pressure corresponding to m/m.
-6
Then, obtain pressure through multiplication using the following
equation.
Pressure(MPa(kPa))= Strain amplifier's output ( m/m)
×Calibration constant (MPa(kPa)/1 m/m)
5.3
When using an amplifier of other type or a recorder, first find the exact
bridge exciting voltage applied. Second, find the pressure that
corresponds to 1 V output voltage against 1V bridge excitation
voltage. Then, obtain the pressure through multiplication using the
following equation.
Pressure(MPa(kPa))=
IM-T-258b 13.06
Green
White
Shielded
Black Red
Bridge output voltage( V)
Bridge excitation voltage( V)
×Calibration constant (MPa(kPa)/1 V/V)