K-TEK MT5000 Installation & Operation Manua page 15

Example:
If the end of the probe, in Figure 13, were 4 inches
off the bottom of the tank the Offset would be 4
inches. If the Measured Level were 21 inches after
entering the OFFSET, the local indicator would
indicate 25 inches (21 +4) and the 4-20 mAdc signal
would indicate a level of 25 inches.
MT5000-0200-1 Rev f (10-2010) DCN0528
Figure 13
Measured
Level
LVL OFFSET
15