CGEO-SG5
Rebar VW Strain Gauge 8
CGEO INTERNATIONAL LIMITED
Installation Manual
3. TAKING READINGS
3.1. Operation of the BSIL-RO-VW Readout Box
BSIL-RO-VW readout is suitable for all BSIL vibrating wire sensors.
Connect the Readout using the flying leads or in the case of a terminal station, with a connector.
The red and black clips are for the vibrating wire gage, the white and green clips are for the
thermistor and the blue for the shield drain wire.
1.
Turn the display selector to position "B". Readout is frequency module and temperature
in
℃
.
2.
Turn the unit on and a reading will appear in the front display window. The last digit may
change one or two digits while reading. Press the "Store" button to record the value
displayed. If the no reading displays or the reading is unstable see section 5 for
troubleshooting suggestions. The thermistor will be read and output directly in degrees
centigrade.
3.
Turn off the readout. Or the unit will automatically turn itself off after approximately 15
minutes to conserve power.
3.2. Measuring Temperatures
Each Vibrating Wire Rebar Strain Gauge is equipped with a thermistor for reading
temperature. The thermistor gives a varying resistance output as the temperature changes.
Usually the white and green leads are connected to the internal thermistor. BSIL-RO-VW
readout will read the thermistor and display temperature by connecting its white and green
leads to white and green leads of rebar strain gauge.
Following is instruction of using ohmmeter to read temperature:
1.
Connect the ohmmeter to the two thermistor leads coming from the Strain Gauge. (Since
the resistance changes with temperature are so large, the effect of cable resistance is usually
insignificant.)
2.
Look up the temperature for the measured resistance in Table B-1. Alternately the
temperature could be calculated using Equation B-1.
