52
9900 Transmitter
De
fi
ning a Custom Tank
1. Determine where the level measurement
should start. This is the zero reference point (Z).
Review the diagram to help select the best option.
2. Determine where you will mount the sensor.
This is S
LOC
. Consult the Sensor manual for
information regarding the best location for
the sensor.
3. Measure the distance between Z and S
LOC
.
This is O(ffset).
4. Enter the Offset into the INPUT Mode menu.
Zero reference point (Z):
The point in the vessel where you want the 9900 to
display zero (0 ft, 0 gal. etc.).
• If Z is located below the
fl
uid surface, the 9900
will display a positive level measurement.
• If Z is located above the
fl
uid surface, the 9900
will display a negative level measurement.
Sensor Location point (S
LOC
):
The point on the level sensor where the
measurement is taken.
• The pressure sensor measures from the
centerline of the diaphragm.
Offset (O):
The distance from Z to S
LOC
.
• Enter a positive value in the Calibrate menu
if the sensor is located above Z.
• Enter a negative value in the Calibrate menu
if the sensor is located below Z.
• Enter 0 in the Calibrate menu if the sensor is
located at Z.
Level (L):
The distance from Z to surface of
fl
uid
(displayed as “Level” by 9900).
L > 0
O(ffset) > 0
Z
(ero)
S
Loc
L > 0
O(ffset) < 0
Z
(ero)
S
Loc
S
Loc
O(ffset) < 0
Z
(ero)
L < 0
Z
Z
For most vessels, the zero reference point (Z) may be
designated as any height in the vessel.
For horizontal cylinders only, the zero reference point
MUST be the lowest point in the vessel.
Custom Measurements