2880R-LT, 2881R-LT, 2882R-LT
Revision 1.0
P a g e 20 | 28
6.4
288XR Controller Calibration
6.4.1
Auto Calibration
For the controller calibration the present tank level, in %, must be known. The % value will be
entered and the tank level must then be changed, up or down, by at least 10%. The new level, in %,
will then be entered as the second and final point.
Following the Menu Flow Chart, enter “Cal only” menu, then “Auto Cal”.
See section 6.2.3 for DATA entry setups.
1. In the 1
st
point entry menu, enter the current level value in % (e.g. 000.0%, or 50.0%).
Confirm the capacitance value in pF is stabilized, press <SELECT> key to accept the 1
st
point value. The cursor will move across and accept the 1
st
Cal point after the last digit of
value entered. The 1
st
calibration point has been done. The LCD will scroll to the 2
nd
% point
entry menu.
2. CHANGE THE LEVEL IN THE VESSEL BY A MINIMUM OF 10.0%. The level may be
raised or lowered. A change of less than 10.0% may be used in some applications but is not
recommended to ensure calibration accuracy. The capacitance value in pF will increase if
raising the level or decrease if lowering the level.
3. In the 2
nd
point entry menu, enter the new current level value in % (e.g. 100.0%, or 30.0%).
Confirm the capacitance value in pF (Bottom line) is stabilized, press <SELECT> key to
accept the 2
nd
point value. The cursor will move across and accept the 2
nd
Cal point after the
last digit of value entered. The 2
nd
calibration point has been done.
If the calibration is successful, the display will show “Cal Ok” for a couple of seconds and then
return to the calibration menu. If the display shows “Cal Err”, then a calibration fault has occurred.
Check the following:
1. The 2nd level entry value is accidentally left at the 1
st
calibration point % level.
- Re-do the auto calibration according to the above steps 1 – 3.
2. The level in the vessel was not changed from the 1
st
calibration point.
- Re-do the auto calibration according to the above steps 1 – 3.
3. If 1 or 2 are not the cause call Arjay Engineering Ltd.: Toll free: (800) 387-9487 (North
America Only), tel. +1 (905) 829-2418.
6.4.2
Manual Calibration
Manual Calibration allows you to override the values that have been set through the automatic
calibration. This feature may be used for a number of different reasons. For example.
1. One of the calibration points is desired to be re-calibrated. The user can view the pF reading
of the probe in the Diagnostics menu and also record the actual level in the vessel at the
same time. These values can then be entered in the Manual Calibration to change either Cal
Point 1 or Cal Point 2.
2. If a calibration was done using 20% and 60 % as the two values (for example), but it was later
determined that the 60% should have been entered as 70%.
3. The process level cannot be altered at the time of calibration so a random pF value and %
level value is entered as the second point to allow operations until a proper second point can
be entered. See method in 1 above.
THIS COMPLETES THE SETUP & CALIBRATION PROCEDURE FOR THE
288XR-LT SERIES CAPACITANCE LEVEL TRANSMITTER
