Reference Manual
00809-0100-4848, RevAA
July 2009
Rosemount 848T Wireless
A-4
Ambient Temperature Effect
Transmitters may be installed in locations where the ambient temperature is between –40 and 85 °C (–40 and 185 °F).
Ambient Temperature Notes
Examples:
• When using a Pt 100 (
= 0.00385) sensor input at 40 °C ambient temperature, temperature effects would be:
Ambient Temperature Effects: 0.003 °C x (40 - 20) = 0.06 °C
• Worst Case Error: Sensor Ac Ambient Temperature Effects = 0.30 °C + 0.06 °C = 0.36 °C
• Total Probable Error
TABLE 2. Ambient Temperature Effects
NIST Type
Accuracy per 1.0 °C (1.8 °F) Change in Ambient
Temperature
(1)
C
Temperature Range (°C)
RTD
Pt 50 (
= 0.003910)
• 0.004 °C (0.0072 °F)
NA
Pt 100 (
= 0.00391)
• 0.004 °C (0.0072 °F)
NA
Pt 100 (
= 0.00385)
• 0.003 °C (0.0054 °F)
NA
Pt 100 (
= 0.003916)
• 0.003 °C (0.0054 °F)
NA
Pt 200 (
= 0.00385)
• 0.004 °C (0.0072 °F)
NA
PT 200 (
= 0.003916)
• 0.004 °C (0.0072 °F)
NA
Cu 10
• 0.03 °C (0.054 °F)
NA
Pt 500
• 0.003 °C (0.0054 °F)
NA
Pt 1000
• 0.003 °C (0.0054 °F)
NA
Cu 100 (a=428)
• 0.002 °C (0.0036 °F)
NA
Cu 50 (a=428)
• 0.004 °C (.0072 °F)
NA
Cu 100 (a=426)
• 0.002 °C (0.0036 °F)
NA
Cu 50 (a=426)
• 0.004 °C (.0072 °F)
NA
Ni 120
• 0.003 °C (0.0054 °F)
NA
Thermocouple
(R = the value of the reading)
NA
Type B
• 0.014 °
C
• 0.032 °C - (0.0025% of (R - 300))
• 0.054 °C - (0.011% of (R - 100))
• R
1000
• 300
R < 1000
• 100
R < 300
Type E
• 0.005 °C + (0.00043% of R)
• All
Type J, Din Type L
• 0.0054 °C + (0.00029% of R)
• 0.0054 °C + (0.0025% of |R|)
• R
0
• R
0
Type K
• 0.0061 °C + (0.00054% of R)
• 0.0061 °C + (0.0025% of |R|)
• R
0
• R
0
Type N
• 0.0068 °C + (0.00036% of R)
• All
Type R, Type S
• 0.016 °
C
• 0.023 °C - (0.0036% of R)
• R
200
• R
200
Type T, DIN Type U
• 0.0064 °C
• 0.0064 °C - (0.0043% of |R|)
• R
0
• R
0
GOST Type L
• 0.007 °C
• 0.007 °C + (0.003% of IRI)
• R
0
• R
0
input Units
Ohm input
• 0.0084 ohms
NA
Millivolt Input
• 0.0005 mV
NA
4–20 mA (Rosemount)
• 0.0001 mA
NA
4–20 mA (NAMUR)
• 0.0001 mA
NA
(1) Change in ambient is in reference to the calibration temperature of the transmitter (20 °C (68 °F) typical from the factory)
.
0.302
0.062
+
0.305
C
=
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