American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 48)

34
Calibration
Calibration Menu Reference
Toggle the units key before beginning entry (or after
ESC
from an
entry in progress) to toggle the units.
The active length must be entered. The active length corresponds to
the physical distance measured between the desired MIN and MAX
points of the sensor.
Note
The active length value should be set to the length which is to be
physically calibrated in the Open or Closed Dewar Calibration
method, or the L
active
value used for the Approximate Calibration
method calculations as documented in paragraph 3.2.3 on page 26.
Once a value has been entered using the
ENTER
key, press the
MENU
key to proceed. If a value has not been entered, the Model 286
will not allow the user to proceed to the next calibration step.
Note
The active length setting can be re-adjusted after MIN/MAX entry
without affecting the MIN/MAX calibration of the instrument.
3.3.5.3 MIN/MAX entry
Before entering the MIN or MAX points, the operator should ensure
that the sensor is properly connected to the Model 286, and that the
cabling configuration is as close as possible to the configuration
used during operation (with the exception of the extension cable).
The sensor should also be cooled to near the operating temperature
to mitigate the effects of any mechanical distortions that may arise
between room temperature and cryogenic temperature.
Note
The MIN and MAX entry can be performed in any order, and can be
performed multiple times. The only requirement is that at least one
MIN and one MAX calibration must be performed to permit the
instrument to make a measurement.
Note
If the instrument beeps twice, then either the just entered MIN point
is greater than a previously entered MAX point, or vice-versa. In
that event, the Model 286 invalidates the previously entered point
A: MIN - Press 7
MAX - Press 8