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DSM250 User’s Manual change the value to the desired tank capacity value, and finally, press the Accept key to confirm your selection.
Figure 202 – Configuring the Tank Capacity
After you have pressed the Accept key, a confirmation screen will appear that warns you that the fluid remaining measurement will change as a result of this change. Press the Accept key to accept the change and store the new tank capacity value within the TLM100, or Press the Cancel Key to cancel the change and leave the old tank capacity programmed into the TLM100.
Figure 203 – Tank Capacity Change Confirmation Screen
6.24.4 Tank Levels Calibration
In order for the TLM100 to indicate an accurate tank level, it must know the geometry of the tank.
There are two methods of calibrating the tank level sender:
• Custom Calibration – use for non-rectangular tanks (also, most accurate in any case, but requires more effort)
• Rectangular Tank – By inputting some dimensions of a rectangular tank, the TLM100 is able to interpolate the volume of liquid from the distance to the surface.
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6.24.4.1 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 TLM100 will measure the distance to the surface at each point and create a custom calibration map which relates the fluid levels to the volume
in the tank. Figure 186 below shows a screenshot of the DSM250 with the Custom Calibration option
highlighted. Custom calibration is necessary for non-rectangular tanks. 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 204 – Performing Custom Calibration of the Tank Level Monitor
The first step in custom calibration of the tank level monitor is to provide an estimated capacity of the tank. This estimated capacity must be within +/- 25% of the actual capacity. To set the estimated tank capacity, use the Increase and Decrease 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 Abort key ( ) will end the process and return you to the Tank Levels Calibration menu.
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Figure 205 – Tank Levels Calibration Capacity Estimation
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DSM250 User’s Manual
The next step in the calibration process is to fill the tank and indicate the volume of fluid in the tank at various points while filling the tank. This process should be started with an empty tank. You only need to indicate two calibration points for a rectangular tank, and can use up to 16 calibration points for a
tank with a more complex shape. Figure 206 shows a screenshot of the first calibration step. Enter
the first calibration point with an empty tank (0.0 Gallons/liters) by pressing the Accept key. The
“Current Point” highlight will advance to the next point.
Figure 206 – Empty Level Calibration
Each time you press Accept during this process and after the Current Point highlight advances, put more fluid into the tank, and note the total volume of fluid pumped into the tank at this point. Use the
Increase and Decrease keys to set the current tank level to the appropriate value, and then press the
Accept
key to store the current calibration point and advance to the next calibration point. Figure 207
shows a screenshot of these intermediate calibration points.
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Figure 207 – Intermediate Level Calibration
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Once the tank is completely full, instead of pressing the Accept key to store the current calibration point, press the Complete key. This will complete the calibration process and will also adjust the tank
capacity to the currently indicated level. Figure 208 below shows the calibration screen at the last
point with the full tank level (and thus the tank capacity) set to 101 gallons.
Figure 208 – Full Level Calibration
After you press accept, a confirmation screen will appear showing completion of the calibration process and the new tank capacity value. A screenshot of this calibration screen is shown below in
Figure 209 – Custom Tank Level Calibration Confirmation Screen
6.24.4.2 Rectangular Tank
If you have a rectangular tank, and you know the capacity of the tank, you can easily calibrate the
sender by using the “Rectangular Tank” menu item. Figure 210 below shows this option highlighted.
Use the Scroll Up ( ) or Scroll Down ( ) keys to move the highlight over this menu item, and then press the Enter key ( ).
Revision 1.4.16a Page 181
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