Maretron DSM150, User Manual

Page: 187 / 274

Revision 1.4.18 Page 171
6.24.5 Tank Levels Calibration
In order for the TLA100 to indicate an accurate tank level, it must know how the resistance of the
resistive tank level sender corresponds to the level of fluid in the tank. There are three methods of
calibrating the tank level sender:

Custom Calibration
– use for non-rectangular tanks or non-standard sensors (also, most
accurate in any case, but requires more effort)

Set to American Standard (240-33 ohm)
– use for rectangular tanks using a tank level sender
with the standard American resistance range (240 ohms at full, 33 ohms at empty).

Set to European Standard (0-180 ohm)
– use for rectangular tanks using a tank level sender
with the standard European resistance range (0 ohms at full, 180 ohms at empty).
6.24.5.1 Custom Calibration
The Custom Calibration setting will provide the most accurate tank level readings under any
circumstances, but it requires that you go through a process in which you gradually fill the tank,
stopping periodically to input the current fluid level. The TLA100 will measure the sender resistance at
each point and create a custom calibration map which relates the resistance of the sender with the
fluid levels. Figure 188 below shows a screenshot of the DSM150 with the Custom Calibration option
highlighted. Custom calibration is necessary for non-rectangular tanks and for non-standard values of
resistances for tank level senders. To perform custom calibration of the tank level sender, use the
Scroll Up (
) or Scroll Down (
) keys to move the highlighted cursor over the “Custom
Calibration…” menu item. Then, press the Enter key (
) to confirm your selection and begin the
calibration process.
Figure 188
– Performing Custom Calibration of the Tank Level Adapter
The first step in custom calibration of the tank level sender is to provide an estimated capacity of the
tank. This estimated capacity must be /- 25% of the actual capacity. To set the estimated tank
capacity, use the arrow keys to adjust the displayed value until the desired value is shown. Then,
press the Accept key to confirm your selection and continue with the calibration process. If you desire
to stop the calibration process, pressing the
Back Key ( ) will end the process and return you to
the Tank Levels Calibration menu.