1. The three wiring methods of Pt100 RTD are different in principle:
The two-wire system and the three-wire system are measured by the bridge method, and the relationship between the temperature value and the analog output value is given after ***. There is no bridge on the four wires, it is completely just sent with a constant current source, measured by a voltmeter, and the measured resistance value is given after ***.
2. The influence of the three wiring methods of Pt100 RTD on the measurement accuracy
The resistance and contact resistance of the connecting wire will have a great impact on the temperature measurement accuracy of Pt100 platinum resistance, and the three-wire or four-wire wiring method of platinum resistance can effectively eliminate this effect.
The detection equipment (thermostat, PLC input, etc.) connected to the RTD has four terminal blocks: I+, I-, V+, V-. Among them, the I+ and I- terminals are used to provide constant current to the RTD, and V+ and V- are used to monitor the voltage change of the RTD and detect the temperature change in turn.
(1) The four-wire system is to draw 4 wires from both ends of the thermal resistance, and the circuit loop and the voltage measurement loop are independently wired separately when wiring, with high measurement accuracy and more wires.
(2) The three-wire system is to draw out the three wires, and the reference of the reference terminal of the current loop and the voltage measurement loop of the current circuit when the Pt100B platinum resistance is wired is a line (that is, the I-terminal and V-terminal of the detection equipment are short-circuited). The accuracy is slightly better.
(3) The two-wire system makes the two wires draw, and the current loop and the voltage measurement loop are combined into one when the Pt100B platinum resistance is wired (that is, the I-terminal and V-terminal of the detection equipment are short-circuited, the I+ terminal and the V+ short-circuit are short-circuited). Poor measurement accuracy.
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