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16 | TAKING READINGS | GEOKON
3.2.1 CONNECTING SENSORS WITH 10-PIN BULKHEAD CONNECTORS
ATTACHED
Align the grooves on the sensor connector (male), with the appropriate
connector on the readout (female connector, labeled senor or load cell). Push
the connector into place, and then twist the outer ring of the male connector
until it locks into place.
3.2.2 CONNECTING SENSORS WITH BARE LEADS
Attach the flying leads to the bare leads of a
connecting each of the clips on the leads to the matching colors of the sensor
conductors, with blue representing the shield (bare).
3.2.3 OPERATING THE GK-405
Press the power button on the Readout Unit. After start-up completes, a blue
light will begin flashing, signifying that the two components are ready to
connect wirelessly. Launch the GK-405 VWRA program by doing the following:
1.
Tap Start on the hand-held PC's main window.
2.
Select Programs.
3.
Tap the GK-405 VWRA icon.
After a few seconds, the blue light should stop flashing and remain lit. The Live
Readings window will display on the hand-held PC.
Set the Display mode to position B.
For more information, consult the GK-405 Instruction Manual.
3.3 MEASURING TEMPERATURES
All
vibrating wire instruments are equipped with a thermistor for
GEOKON
reading temperature. The thermistor gives a varying resistance output as the
temperature changes. The white and green leads of the instrument cable are
normally connected to the internal thermistor.
The GK-404 and GK-405 readouts will read the thermistor and display the
temperature in degrees Celsius.
TO READ TEMPERATURES USING AN OHMMETER:
1.
Connect an ohmmeter to the green and white thermistor leads coming
from the instrument. Since the resistance changes with temperature are
large, the effect of cable resistance is usually insignificant. For long cables
a correction can be applied equal to approximately 48.5Ω per km (14.7Ω
per 1000') at 20 °C. Multiply these factors by two to account for both
directions.
2.
Look up the temperature for the measured resistance in Appendix B.
vibrating wire sensor by
GEOKON
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