Fluke 744 - Using Resistance-Temperature Detectors (Rtds); RTD Types Accepted

Documenting Process Calibrator
Using Measure Mode
37
Using Resistance-Temperature Detectors
(RTDs)
The calibrator accepts RTD types shown in Table 6.
RTDs are characterized by their resistance at 0 °C
(32 °F), which is called the “ice point” or R
0
. The
most common R
0
is 100 Ω. Most RTDs come in a
three-terminal configuration. The calibrator accepts
RTD measurement inputs in two-, three-, or four-wire
connections as shown in Figure 15. A four-wire
configuration provides the highest measurement
precision, and two-wire provides the lowest
measurement precision.
Table 6. RTD Types Accepted
RTD Type Ice Point (R
0
) Material α Range (°C)
Pt100 (3926) 100 Ω Platinum 0.003926 Ω/°C -200 to 630
*Pt100 (385) 100 Ω Platinum 0.00385 Ω/°C -200 to 800
Ni120 (672) 120 Ω Nickel 0.00672 Ω/°C -80 to 260
Pt200 (385) 200 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt500 (385) 500 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt1000 (385) 1000 Ω Platinum 0.00385 Ω/°C -200 to 630
Cu10 (427) 9.035 Ω ** Copper 0.00427 Ω/°C -100 to 260
Pt100 (3916) 100 Ω Platinum 0.003916 Ω/°C -200 to 630
*Per IEC 751-Standard **10 Ω @ 25 °C