Semiconductor Sensor Measurement Accuracy; Rtd Measurement Accuracy - Measurement Computing USB-5200 Series User Manual

USB-5203 User's Guide
Table 4. Thermocouple accuracy specifications, including CJC measurement error
Sensor Type
J
K
S
R
B
E
T
N

Semiconductor sensor measurement accuracy

The error shown in Table 5 below does not include errors of the sensor itself. These specs are for one year while
operation of the device is between 15 °C and 35 °C. Please contact your sensor supplier for details on the actual
sensor error limitations.
Sensor Type
LM35, TMP35 or equivalent

RTD measurement accuracy

The error shown in Table 6 below does not include errors of the sensor itself. The sensor linearization is
performed using a Callendar-Van Dusen linearization algorithm. These specs are for one year while operating
the device between 15 °C and 35 °C. The specification does not include lead resistance errors for 2-wire RTD
connections. Please contact your sensor supplier for details on the actual sensor error limitations.
In RTD mode, the device cannot measure resistance values greater than 660 Ω. The 660 Ω resistance limit
includes the total resistance across the current excitation (Ix+/Ix–) pins, which is the sum of the RTD resistance
and the lead resistances.
For accurate three-wire compensation, the individual lead resistances connected to the Ix+/Ix– pins must be of
equal value.
RTD Sensor
Temperature (°C)
PT100, DIN, US –200 to –150
or ITS-90
–150 to –100
–100 to 0
0 to 100
100 to 300
300 to 600
Maximum error (°C)
±1.499
±0.643
±1.761
±0.691
±2.491
±1.841
±2.653
±1.070
±1.779
±0.912
±1.471
±0.639
±1.717
±0.713
±1.969
±0.769
Table 5. Semiconductor sensor accuracy specifications
Temperature Range (°C)
–40 to 150
Table 6. RTD measurement accuracy specifications
Maximum Accuracy Error (°C)
Ix+ = 210 µA
±2.85
±1.24
±0.58
±0.38
±0.39
±0.40
Typical error (°C) Temperature range (°C)
±0.507 –210 to 0
±0.312 0 to 1200
±0.538 –210 to 0
±0.345 0 to 1372
±0.648 –50 to 250
±0.399 250 to 1768.1
±0.650 –50 to 250
±0.358 250 to 1768.1
±0.581 250 to 700
±0.369 700 to 1820
±0.462 –200 to 0
±0.245 0 to 1000
±0.514 –200 to 0
±0.256 0 to 600
±0.502 –200 to 0
±0.272 0 to 1300
Maximum Accuracy Error (°C)
±0.50 (Note 2)
24
Specifications
Typical Accuracy Error (°C)
Ix+ = 210 µA
±2.59
±0.97
±0.31
±0.11
±0.12
±0.12