Valve Position Indication; Continuously Measuring Valve Position Measuring System; Tolerance Band Of The Valve Position Measuring System - SPX FLOW APV CU4 plus Instruction Manual

SPX FLOW
SPX FLOW_CU4.plus. 24V Direct Connect_IECEx_Zone 2_GB-1_012024_for D4. Valves.indd
Control Unit
CU4plus Direct Connect
Instruction Manual GB-0
7. Valve Position Indication
7.1. Continuously measuring valve position measuring system
For the internal detection of the valve position indication, a contact-
free operating linear sensor is used which is actuated via the
magnetic switching cam installed at the valve rod. The nominal
measuring range of the measuring system amounts to 0 - 72 mm,
relative repetitive accuracy < 0.1 mm.
Within this measuring range, the corresponding positions for closed
and open valve position as well as seat lift positions are generated
via the Teach-in function and permanently saved in the electronic.
7.2. Tolerance band of the valve position measuring system
The tolerance band of the valve position measuring system
describes the active measuring range in which the corresponding
feedback information, closed or open valve position, is registered.
For different process valves also different tolerance bands exist.
The adjustment is realized via the ToolBox software.
Tolerance
band
T1
valve
stroke
(mm)
Output of feedback
signals in range
+/- 1 mm
tolerance
band
T1
± 1mm
35 35
34
33
32
31
30 30
29
28
27
26
25 25
GB
Recommendation for
valve type
e.g. D4, D4 SL
35
34
33
32
31
30
29
28
27
26
25
33
35
34
33
32
31
30
29
28
27
26
25