44 Rev. 2
Calibration
Capacitance-Based Level Calibration : Pre-Calibration Procedure
still expected to perform a more accurate calibration where feasible, such
as the open dewar or closed dewar calibration, with the target liquid.
For the case where a sensor is too long to be calibrated in AMI facilities,
AMI performs a partial length open dewar calibration in liquid nitrogen,
and then calculates the maximum calibration point. A dielectric ratio (i.e.
approximate calibration factor) may also be subsequently used to adjust
for a target liquid other than liquid nitrogen. The customer is expected to
perform a more accurate open dewar or closed dewar calibration if feasible.
4.2.5 Pre-Calibration Procedure
4.2.5.1 Enter Capacitance Sensor Information
1. Press the MENU button in the
lower left corner of the display
screen.
2. Choose the SENSORS
selection from the MENU
screen.
3. If the capacitance sensor will
be longer than 15 feet from the
instrument, ensure an
Oscillator/Transmitter is used
between the instrument and
the sensor.
4. Verify that the oscillator
source selection is correct,
either INTERNAL or
EXTERNAL. Note that this
setting is auto-detected by the
instrument,
Figure 4-8. MENU Selection Button
Figure 4-9. SENSORS Selection Button
Figure 4-10. NITROGEN OSCILLATOR
Selection
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