COMMISSIONING
Part No.: 4417340 Revision 1 Service Manual 241
954 SmartServo FlexLine
For the tank shell compensation, the following entities should be
set:
Entity name Default Value Explanation
[Tank shell expansion
coefficient]
< 16x10
-6
[1/°C] >
Expansion coefficient of the tank shell.
Carbon steel: 12x10
-6
[1/°C]
Stainless steel: 16x10
-6
[1/°C]
[Tank shell reference
temperature]
< 20 [°C] >
Reference temperature for the tank shell
compensation
[Tank shell ambient temperature
selection]
< TII-SRV board
temperature>
Select the board temperature, magnet
temperature, the ambient temperature provided by
a local RTD board or the ambient temperature
distributed by a CIU.
[Tank shell vapour ambient ratio] < 0.5 >
Ratio of vapour and ambient temperatures for
calculation of the dry part of the tank shell
temperature. Refer to table 4 for more information
on the settings in a particular situation.
[Tank shell product ambient
ratio]
< 0.875 >
Ratio of product and ambient temperatures for
calculation of the wet part of the tank shell
temperature. Refer to table 4 for more information
on the settings in a particular situation.
Standard values for [Tank shell vapour ambient ratio] and
[Tank shell product ambient ratio]
Tank type
[Tank shell vapour
ambient ratio]
[Tank shell product
ambient ratio]
Fixed roof tank 0.5 0.875
Fixed roof tank with stilling well *) 1 1
Insulated fixed roof tank 1 1
Floating roof tank with stilling well *) 0 1
Floating roof tank without stilling well 0 1
*) Here is meant that the SmartServo is installed on the stilling well.
The stilling well must be fixed at the tank bottom or at the first ring of the tank shell. If the stilling well is fixed at the top of the
tank, then select the values for entity items [Tank shell vapour ambient ratio] from the tank type without stilling well.
The gauge reference height is compensated for both the wet and dry
part of the tank shell. The compensated gauge reference height
[Compensated tank top] is available as a reference for hand
measurements.
Note: For proper reference a hand measurement must use the compensated
gauge reference height and subtract a temperature compensated tape value!
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