Blue Sea Systems 1801 Vessel Systems Monitor VSM 422 - Manual (Page 18)

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Tank calibration is most accurate if performed when the tank is as close to
empty as possible.
Auto Calibration Procedure Selection Charts
If the tank is near empty: ≤10% Full
(the current tank level will be assumed to be the empty point by the meter)
The amount of liquid added during
calibration can be measured
YES NO
The empty tank
capacity is known
YES Procedure 1 (page 33) Procedure 1 (page 33)
NO Procedure 1 (page 33) Procedure 1 * (page 33)
If the tank is not empty: >10%–30% Full
The amount of liquid added during
calibration can be measured
YES NO
The empty tank
capacity is known
YES Procedure 2 (page 37) Procedure 3 † (page 41)
NO Procedure 3 * † (page 41) Procedure 3 * † (page 41)
* Monitor will only be able to correctly display percentage. Use 100 as the
full tank capacity.
† Must be able to estimate the percentage of the tank that is filled at the start
of Auto Calibration.
Tank Configuration (Auto Calibration)
Specifications subject to change. See www.bluesea.com for current information.
After following steps 1–13 on pages 25–27, continue with the appropriate
Auto Calibration procedure.
When running the Auto Calibration it is important that the current tank’s
alarms are turned off and that the boat will not trigger any alarm for other
systems. If an alarm occurs, auto calibration must be run again for accurate
tank metering. It is recommended that tank levels are as low as safely
possible before running calibration. For gray and black water tanks, fresh
water may be used to fill the tank during calibration.
There are three different Auto Calibration procedures that can be run
depending on what information is known. Use the Auto Calibration
Procedure Selection Charts on page 32 to determine the needed
information and the appropriate procedure number.
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Tank Configuration (Auto Calibration)
Specifications subject to change. See www.bluesea.com for current information.