DHP-UM-020
Val Controls A/S
•
Limfjordsvej 3
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DK-6715 Esbjerg N
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Tel. +45 7547 0600
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Fax +45 7547 0611
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www.valcontrols.com
Revision: 12
16/38
Deadband
The deadband can be manual altered from the user menu. The standard adjustment is 1% but this
value can be changed from 0.1 to 10 %.
Note: The deadband is on the position of the valve - not the flow!
If the deadband is set to e.g. 5% the valve positioner will regulate with a set point accuracy of +/- 5
% and stay there until the position feedback is bigger than 5 %.
Flow curve
The valve characteristic expresses the flow percent through a valve at different opening angles. To
obtain an accurate regulation of the flow media it is important to choose a valve characteristic that
is identical with the one for the valve used.
Linear valve characteristic
The flow through the valve is proportional with the travel of the valve. The linear valve-
characteristic can be chosen from the user menu.
Equal Percentage 50:1
The flow through the valve rises in the last part of the curve. The equal percentage valve
characteristic can be chosen from the user menu.
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25
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75
100
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Travel - %
