12
Rosemount 248
August 2014
www.rosemount.com
Transmitter accuracy and ambient temperature effects
Note
The accuracy and ambient temperature effect is the greater of the fixed and percent of span values (see example).
Table 3. Rosemount 248 Transmitter Input Options, Accuracy, and Ambient Temperature Effects
Sensor
Transmitter input ranges
(1)
(1) Input ranges are for transmitter only. Actual sensor (RTD or Thermocouple) operating ranges may be more limited.
Accuracy
Temperature effects per 1.0 °C (1.8 °F)
change in ambient temperature
(2)(3)(12)
(2) Change in ambient is with reference to the calibration temperature of the transmitter at 68 °F (20 °C) from factory.
(3) Ambient temperature effect specification valid over minimum temperature span of 28°C (50°F).
°C °F Fixed % of span Fixed % of span
2-, 3-, 4-wire RTDs
Pt 100
(4)
(α =0.00385)
(4) IEC 751, 1995.
–200 to 850 –328 to 1562 0.2 °C (0.36 °F) ±0.1 0.006 °C (0.011 °F) ±0.004
Pt 100
(5)
((α =0.003916) –200 to 645 –328 to 1193 0.2 °C (0.36 °F) ±0.1 0.006 °C (0.011 °F) ±0.004
Pt 200
(4)
–200 to 850 –328 to 1562 1.17 °C (2.11 °F) ±0.1 0.018 °C (0.032 °F) ±0.004
Pt 500
(4)
–200 to 850 –328 to 1562 0.47 °C (0.85 °F) ±0.1 0.018 °C (0.032 °F) ±0.004
Pt 1000
(4)
–200 to 300 –328 to 572 0.23 °C (0.41 °F) ±0.1 0.010 °C (0.018 °F) ±0.004
Ni 120
(6)
–70 to 300 –94 to 572 0.16 °C (0.29 °F) ±0.1 0.004 °C (0.007 °F) ±0.004
Cu 10
(7)
–50 to 250 –58 to 482 2 °C (3.60 °F) ±0.1 0.06 °C (0.108 °F) ±0.004
Cu 50 (α = 0.00428) –185 to 200 –365 to 392 0.68 °C (1.22 °F) ±0.1 0.012 °C (0.022 °F) ±0.004
Cu 100 (α = 0.00428) –185 to 200 –365 to 392 0.34 °C (0.61 °F) ±0.1 0.006 °C (0.011 °F) ±0.004
Cu 50 (α = 0.00426) –50 to 200 –122 to 392 0.68 °C (1.22 °F) ±0.1 0.012 °C (0.022 °F) ±0.004
Cu 100 (α = 0.00426) –50 to 200 –122 to 392 0.34 °C (0.61 °F) ±0.1 0.006 °C (0.011 °F) ±0.004
PT 50 (α = 0.00391) –200 to 550 –392 to 1022 0.40 °C (0.72 °F) ±0.1 0.012 °C (0.022 °F) ±0.004
PT 100 (α = 0.00391) –200 to 550 –392 to 1022 0.20 °C (0.36 °F) ±0.1 0.006 °C (0.011 °F) ±0.004
Thermocouples
(8)
Type B
(9)(10)
100 to 1820 212 to 3308 1.5 °C (2.70 °F) ±0.1 0.056 °C (0.101 °F) ±0.004
Type E
(9)
–50 to 1000 –58 to 1832 0.4 °C (0.72 °F) ±0.1 0.016 °C (0.029 °F) ±0.004
Type J
(9)
–180 to 760 –292 to 1400 0.5 °C (0.90 °F) ±0.1 0.016 °C (0.029 °F) ±0.004
Type K
(9)(11)
–180 to 1372 –292 to 2501 0.5 °C (0.90 °F) ±0.1 0.02 °C (0.036 °F) ±0.004
Type N
(9)
–200 to 1300 –328 to 2372 0.8 °C (1.44 °F) ±0.1 0.02 °C (0.036 °F) ±0.004
Type R
(9)
0 to 1768 32 to 3214 1.2 °C (2.16 °F) ±0.1 0.06 °C (0.108 °F) ±0.004
Type S
(9)
0 to 1768 32 to 3214 1 °C (1.80 °F) ±0.1 0.06 °C (0.108 °F) ±0.004
Type T
(9)
–200 to 400 –328 to 752 0.5 °C (0.90 °F) ±0.1 0.02 °C (0.036 °F) ±0.004
DIN Type U
(12)
–200 to 900 –328 to 1652 0.7 °C (1.26 °F) ±0.1 0.022 °C (0.040 °F) ±0.004
DIN Type U
(12)
–200 to 600 –328 to 1112 0.7 °C (1.26 °F) ±0.1 0.026 °C (0.047 °F) ±0.004
Type W5Re/W26Re
(13)
0 to 2000 32 to 3632 1.4 °C (2.52 °F) ±0.1 0.064 °C (0.115 °F) ±0.004
GOST Type L -200 to 800 -392 to 1472 0.50 °C (0.90 °F) ±0.1 0.003 °C (0.005 °F) ±0.004
Millivolt Input –10 to 100 mV 0.03 mV ±0.1 0.001 mV ±0.004
2-, 3-, 4-wire Ohm Input 0 to 2000 ohms 0.7 ohm ±0.1 0.028 ohm ±0.004
(2 pages)
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