to understand Rosemount 644 temperature transmitter wiring
The Rosemount 644 temperature transmitter is divided into single input 644H and dual input 644S.
The xinyuan instrument introduces the temperature transmitter 644 wiring. Please learn the wiring of
Sanitary Housing Covers:
Temperature transmitter 644 wiring needs attention
1. When the thermal resistance input is wired:
Temperature Transmitter Transmitters accept a variety of RTD configurations, including 2-wire, 3-wire or 4-wire configurations.
If the transmitter is installed away from the 3-wire or 4-wire RTD, if the resistance of each lead is 60 ohms, the transmitter can
operate as specified without recalibration. In this case, the leads between the RTD and the transmitter should have a shield.
If only two leads are used and the two RTD leads are connected in series with the sensor element, then when the lead length
exceeds three feet [20AWG line, Note: AWG American wire gauge, the value in front of the AWG (eg 20AWG, 24AWG) indicates
the final wire formation The number of holes to pass before the diameter, the larger the value, the more holes the wire passes
through, and the smaller the diameter of the wire, the more obvious errors may occur. For 2-wire and 3-wire RTDs, additional lead
resistance errors occur when the ambient temperature changes.
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