Honeywell FlexLine SmartServo 954 - Level Calibration Using the Top of Ball Valve

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234 Service Manual Part No.: 4417340 Revision 1
954 SmartServo FlexLine
Level calibration using the top of ball valve
If level dipping is not possible, the 954 SmartServo FlexLine can be
calibrated using the top of a ball valve as reference point.
Make sure the servo auto test downwards is disabled, else the servo gauge will end
up in a SAT failure and will stop measuring level. Refer to section 8.7
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Proceed as follows:
Entity name Entity name
(SmartView)
Description
[Calibrate] [Calibrate]
(Product level)
The displacer will be raised until it stops against the
flange of the level gauge.
Caution
If a 45 mm displacer is used, immediately stop the
Calibrate command as soon as the displacer is above
the ball valve, followed by a freeze command.
Make sure the displacer is positioned above the ball
valve. Close the ball valve.
[Unlock] [Unlock]
(Product level)
Unlock the gauge and wait the displacer reaches the top
of the ball valve.
Calculate the immersion depth of the displacer at the
product interface (for a 90 mm displacer use 3 mm; for a
45 mm displacer use 12 mm).
[Reference level] [Reference level]
(Product level)
Enter the position of the top of the ball valve with respect
to the tank zero adding the immersion depth of the
displacer at the product level.
[Accept reference] [Accept reference]
(Product level)
By giving this command, the level value entered in entity
[Reference level] is accepted as level value and will be
shown on the display after the automatic reset.
[Calibrate] [Calibrate]
(Product level)
The displacer will now raise from the ball valve. Let it
stop against the flange or give a freeze command.
Open the ball valve.
[Unlock]
[Unlock] (Product
level)
Unlock the gauge. The displacer will now move down till
it reaches the level
For verification of the level calibration, refer to section 8.8.2