ICON LevelPro ITC 450 Series Quick Start Manual page 8

ITC 450 / ITC 470 SERIES
Industrial Level Controller
LevelPro — ITC 450 & 350 Series
®
Tank Level Display + Controller
ITC 450 / ITC 470 SERIES
Industrial Level Controller
Wiring Diagrams
Temperature sensor can be connected to the device in typical 4-wire circuit (Figure 4.17a) or 3-wire circuit
(Figure 4.17b). Due to precision of measurement 4-wire circuit is recommended.
If 2 wire circuit is used, the resistance of wires should be as small as possible, to avoid of measurement
Temperature sensor can be connected to the device in typical 4-wire circuit (Figure P-a) or 3-wire circuit (Figure P-b). Due to
errors. Measured value can be corrected (constant correc�on) using „toFS" parameter from menu
Temperature sensor can be connected to the device in typical 4-wire circuit (Figure 4.17a) or 3-wire circuit
precision of measurement 4-wire circuit is recommended.
„inPt". Due to low precision 2-wire connec�on is not recommended.
(Figure 4.17b). Due to precision of measurement 4-wire circuit is recommended.
If 2 wire circuit is used, the resistance of wires should be as small as possible, to avoid of measurement errors. Measured
value can be corrected (constant correcton) using "toFS" parameter from menu "inPt". Due to low precision 2-wire
If 2 wire circuit is used, the resistance of wires should be as small as possible, to avoid of measurement
connection is not recommended.
When 4-wires or 2-wires connec�on is used, the resistance of par�cular wires (Ra ÷ Rd) CAN BE DIFFERENT.
errors. Measured value can be corrected (constant correc�on) using „toFS" parameter from menu
When 3-wires connec�on is used, the resistance of par�cular wires (Ra ÷ Rd) MUST BE IDENTICAL to enable
When 4-wires or 2-wires connection is used, the resistance of particular wires (Ra ÷ Rd) CAN BE DIFFERENT. When 3-wires
connection is used, the resistance of partcular wires (Ra ÷ Rd) MUST BE IDENTICAL to enable proper compensation of it's „inPt". Due to low precision 2-wire connec�on is not recommended.
proper compensa�on of it's resistance. The resistance of par�cular wire should not be greater than 20 .
resistance. The resistance of particular wire should not be greater than 20Ω.
When 4-wires or 2-wires connec�on is used, the resistance of par�cular wires (Ra ÷ Rd) CAN BE DIFFERENT.
When 3-wires connec�on is used, the resistance of par�cular wires (Ra ÷ Rd) MUST BE IDENTICAL to enable
a)
proper compensa�on of it's resistance. The resistance of par�cular wire should not be greater than 20 .
a)
Ra, Rb, Rc, Rd can be different
Ra, Rb, Rc, Rd can be different
24-0352 © Icon Process Controls Ltd.
All connections must be made
while power supply is disconnected.
Figure N. — Connection of 3-wire current converters
Figure O. — Connection of voltage converters
b)
31 32 33 34
Ra Rb Rc : Rd
b)
31 32 33 34
RTD
Ra Rb Rc : Rd
Figure 4.17. Connection of RTD sensors:
Figure P. — Connection of RTD sensors:
a) 4-wires circuit; b) 3-wires circuit; c) 2-wires circuit
RTD
a) 4-wires circuit; b) 3-wires circuit; c) 2-wires circuit
Figure 4.17. Connection of RTD sensors:
a) 4-wires circuit; b) 3-wires circuit; c) 2-wires circuit
c)
31 32 33 34
n.c.
Ra Rc : Rd
c)
31 32 33 34
RTD
n.c.
Ra = Rc = Rd
Ra Rc : Rd
RTD
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Ra = Rc = Rd
31 32 33 34
n.c. n.c.
Ra Rc
31 32 33 34
RTD
n.c. n.c.
Ra, Rc can be different
Ra Rc
RTD
Ra, Rc can be different
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R
R
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