Pyxis LT-635, Руководство пользователя, Страница: 7 / 24

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Pyxis LT-635 User Manual 6
2 Quick 4-20mA Start
Follow the wiring table below to connect the LT-635 sensor to a controller or PLC. *NOTE* All Pyxis sensors
provide a passive 4-20mA output signal, they are NOT LOOP POWERED. 24VDC+ power supply and 4-
20mA+ signal are independent of each other in all Pyxis Lab sensors.
Color Designation
Brown Power GND
Green RS-485 C
Yellow RS-485 B
Gray*
4-20mA -
(Internally connected to power ground
)
Pink Not Used
Blue RS-485 A
White 4-20mA + (TSS)
Red 24V+
Silver PE
*NOTE* The 24V- power ground (brown) and the 4-20 mA- (gray) return are internally connected. If the
24V- power ground and the 4-20 mA return in the controller are internally connected (non-isolated 4-20mA
input), it is unnecessary to connect the 4-20 mA- (gray wire) to the 4-20 mA negative terminal in the
controller. If a separate DC power supplier other than that from the controller is used, make sure that the
output from the power supply is rated for 22-26 VDC @ 250mA.
Please refer to the table below for proper LT-635 input 4-20mA scaling in your receiving display, controller,
or PLC.
LT-635 Output Scaling (4-20mA)
mA Value Units
4 0 g/L
20 30 g/L