In a standard 3-wire RTD, how many wires are usually the same color?

Multiple Choice Questions Instrumentation MCQ
1

In a standard 3-wire RTD, how many wires are usually the same color?

A. 1

B. 2

C. 3

D. 4

3 wire RTD
3 wire RTD1536×1024 261 KB

View Answer

B: 2

Explanation:

A standard 3-wire RTD (Resistance Temperature Detector) typically has two wires of the same color and one wire of a different color.

The two same-colored wires are connected to one end of the RTD sensing element, while the third wire is connected to the other end. This arrangement allows the measuring instrument to compensate for lead wire resistance, improving measurement accuracy compared to a 2-wire RTD.

A common color scheme is:

:red_circle: Red
:red_circle: Red
:white_circle: White

or

:black_circle: Black
:black_circle: Black
:white_circle: White

Note: As per standard

The 3-wire configuration is widely used in industrial temperature measurement because it provides a good balance between accuracy and installation cost.

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