d. Settings
All the settings of the device are made on this screen. Temperature settings can be set in the Settings screen for Partial Control
Test (PST), Counter 2 reset, Product ID and password change, manual control and warning. Each setting is described in detail in the
following sections.
e. Partial Stroke Test (PST)
It is a method used to test whether the actuator is operating safely on valves used for safety purposes and no closure option.
The point that needs attention is that the valve must be open when the PST test is performed. When testing the closed valves, the
valve must first be opened.
After starting the test, the valve is switched to half-closed. Test whether the closing task is performed or not. The closing time is
measured and gives a fault indication if the value is outside of the specified limit. In the next step, pressure values are measured from
two channels. After waiting for 10 sec, the pressure values are measured again. In this way it is determined whether there is any air
leakage. The valve opens again. The opening time is measured and gives a fault indication if the value is outside of the specified limit.
The opening and closing time measurements are made to determine whether the actuator is squeezed or strained. In case of passing
all tests, the test successful letter will remain on the screen for 3 sec and switched to the monitoring screen.
Fi
gure 18:
Settings screen
Figure 19:
Partial stroke test start screen
Figure 20:
PST test initial condition screen
SMS-TORK Endüstriyel Otomasyon Ürünleri San. Tic. Ltd. Şti.
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valve & automation
