Rosemount 148, Reference Manual, Page: 34 / 52

Reference Manual
00809-0100-4148, Rev BA
July 2010
Rosemount 148
A-4
Sensor Connections
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 below).
Table A-2. Rosemount 148 Transmitter Input Options, Accuracy, and Ambient Temperature Effects
Rosemount 148 Sensor Connections Diagram
* Rosemount Inc. provides 4-wire sensors for all single element RTDs. You can use these
RTDs in 3-wire configurations by leaving the unneeded leads disconnected and insulated
with electrical tape.
1 2 3 4 2 3 4 1 2 3 4 1 2 3 4 1
2-wire
RTD and
⍀
3-wire*
RTD
and
⍀
4-wire
RTD
and
⍀
T/C
Sensor Transmitter Input Ranges
(1)
(1) Input ranges are for transmitter only. Actual sensor (RTD or Thermocouple) operating ranges may be more limited. See
“Sensor Specifications” on page 84 for temperature ranges.
Accuracy
Temperature Effects per 1.0 °C (1.8 °F)
Change in Ambient Temperature
(2)()
(2) Change in ambient is with reference to the calibration temperature of the transmitter at 68 °F (20 °C) from factory.
°C °F Fixed % of Span Fixed % of Span
2-, 3-, 4-wire RTDs
Pt 100
(3)
(

= 0.00385)
(3) IEC 751, 1995
–200 to 850 –328 to 1562 0.3 °C (0.54 °F) ±0.15 0.009 °C (0.016 °F) ±0.006
Pt 100
(4)
(

= 0.003916)
(4) JIS 1604, 1981
–200 to 645 –328 to 1193 0.3 °C (0.54 °F) ±0.15 0.009 °C (0.016 °F) ±0.006
Ni 120
(5)
(5) Edison Curve No. 7
–70 to 300 –94 to 572 0.2 °C (0.36 °F) ±0.15 0.006 °C (0.011 °F) ±0.006
Cu 10
(6)
(6) Edison Copper Winding No. 15
–50 to 250 –58 to 482 3 °C (5.40 °F) ±0.15 0.09 °C (0.16 °F) ±0.006
Thermocouples
(7)
(7) Total accuracy for thermocouple measurement: sum of ac0.5 °C.
Type B
(8) (9)
(8)
NIST Monograph 175, IEC 584
(9) Fixed accuracy for NIST Type B is ±5.4 °F (±3.0 °C) from 212 to 572 °F (100 to 300 °C).
100 to 1820 212 to 3308 2.3 °C (4.05 °F) ±0.15 0.084 °C (0.150 °F) ±0.006
Type J
(8)
–180 to 760 –292 to 1400 0.8 °C (1.35 °F) ±0.15 0.03 °C (0.054 °F) ±0.006
Type K
(8) (10)
(10) Fixed accuracy for NIST Type K is ±1.3 °F (±0.7 °C) from -292 to -130 °F (-130 to -90 °C).
–180 to 1372 –292 to 2502 0.8 °C (1.35 °F) ±0.15 0.03 °C (0.054 °F) ±0.006
Type N
(8)
–200 to 1300 –328 to 2372 1.2 °C (2.16 °F) ±0.15 0.03 °C (0.054 °F) ±0.006
Type R
(8)
0 to 1768 32 to 3214 1.8 °C (3.24 °F) ±0.15 0.09 °C (0.16 °F) ±0.006
Type S
(8)
0 to 1768 32 to 3214 1.5 °C (2.70 °F) ±0.15 0.09 °C (0.16 °F) ±0.006
2-, 3-, 4-wire Ohm Input 0 to 2000 ohms 1.1 ohm ±0.15 0.042 ohm ±0.006