5
12)
Add fresh desiccant to the desiccant chamber (or the vent line manifold).
13)
Add more liquid to the reservoir to bring up to the half-full point. A few drops of light oil
added through the top of the reservoir will prevent evaporation from the liquid surface.
14)
Reconnect the vent line fitting to the top of the reservoir.
15)
Connect the sensor cable to the terminal panel (if one exists) as follows: Black and Red wires
to the gauge position, Green and White wires to the thermistor (temperature) position.
Manual switch panels can be used in conjunction with GK-403, GK-404, or GK-405 readout
boxes. Terminal strips are used in conjunction with dataloggers.
2.4 Initial Readings
Initial readings must be taken with great care; they are the base line readings to which all
subsequent readings are compared. It is important that the liquid filled tubes be at a constant
temperature. If the tubes are not completely buried the readings should be taken at a time when
the temperature is relatively constant. The readings should never be taken when the tubes are
exposed to direct sunlight. In addition, there should be no air bubbles in the liquid tubes. If air
bubbles are detected the tubes should be flushed before the initial readings are taken. If there is
any doubt, take readings, flush the tubing, and take readings again. Repeat if necessary until the
readings are stable. (See Section 3 for readout instructions.) Always record the ambient
temperature when taking readings.
Take careful measurement of the elevation of the liquid level inside the reservoir sight tube.
Make a mark on the tube opposite the liquid level. This will serve as a quick visual check on any
fluctuations and enable a quick means of measuring the magnitude of the change. For correction
of subsequent calculations of settlement, see Section 4. (Reservoir level fluctuations may be due
to temperature or pressure fluctuations or due to leakage.)
