DID-UM-002
Val Controls A/S
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Limfjordsvej 3
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DK-6715 Esbjerg N
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Tel. +45 7547 0600
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www.valcontrols.com
Revision: 10
14/74
Figure 3: PST position and pressure definitions
The IDC must be calibrated before it can perform a test.
When a test is started the position and pressure is evaluated. A test will not be started if the start
conditions are not correct. The start conditions are as follow:
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Valve must be at the operational position
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Pressure must be within the Start pressure low and Start pressure high limits.
An error will indicate what the problem is.
The IDC monitors the position and pressure during the test. The IDC aborts the test and report an
error if the limits in the error parameters are reached.
If a test does not reach the error limits it will run until finished and then the warning parameters are
evaluated. See Figure 4 for flow diagram describing the general functional description of a PST.
If the system does not have a pressure sensor, all pressure related parameters, warnings and errors
will be ignored.
The errors or warnings can only be removed by performing a successful test.
