Figure 2. Dimension of the ST-525SS (inch)
4.1
Wiring
If the power ground terminal and the negative 4-20mA terminal in the controller are internally connected
(non-isolated 4-20mA input), it is unnecessary to connect the 4-20mA negative wire (green) to the 4-20mA
negative terminal in the controller. If a separate DC power supply other than that from the controller is
used, make sure that the output from the power supply is rated for 22-26 VDC @ 65mA.
*
NOTE
*
The negative 24V power terminal (power ground) and the negative 4-20mA ter-
minal on the ST-525SS probe are internally connected.
Follow the wiring table below to connect the ST-525SS probe to a controller:
Wire Color
Designation
Red
24V +
Black
24V Power ground
White
4-20mA +
Green
*
4-20mA -
Blue
RS-485 A
Yellow
RS-485 B
Clear
Shield, earth ground
*
Internally connected to the power
ground
ST-525SS User Manual
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