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Reference Manual
00809-0200-4101, Rev AA
July 2008
Rosemount 2051
A-2
Long Term Stability
Dynamic Performance
Line Pressure Effect per
1000 psi (6,9 MPa)
Models Standard Performance Option, P8
2051C
(1)
Ranges 2-5 ±0.1% of URL for 2 years ±0.125% of URL for 5 years
2051CD
Range 1
±0.2% of URL for 1 year
2051T
(1)
Ranges 1-5 ±0.1% of URL for 2 years ±0.125% of URL for 5 years
(1) Measured at reference conditions after exposure to temperature changes of up to ±50 °F (28 °C), and line pressure changes up to 1000 psi
(6,9 mPa).
4 - 20 mA HART
(1)
1-5 Vdc HART Lower Power
(1)
Fieldbus
(3)
Typical HART Transmitter Response Time
Total Response Time (T
d
+ T
c
)
(2)
:
2051C, Range 3-5:
Range 1:
Range 2:
2051T:
2051L:
115 milliseconds
270 milliseconds
130 milliseconds
100 milliseconds
See Instrument Toolkit
®
152 milliseconds
307 milliseconds
152 milliseconds
152 milliseconds
See Instrument Toolkit
Dead Time (Td) 60 milliseconds (nominal) 97 milliseconds
Update Rate 22 times per second 22 times per second
(1) Dead time and update rate apply to all models and ranges; analog output only
(2) Nominal total response time at 75 °F (24 °C) reference conditions.
(3) Transmitter fieldbus output only, segment macro-cycle not included.
T
c
T
d
T
d
= Dead Time
T
c
= Time Constant
Pressure Released
Response Time = T
d
+T
c
63.2% of Total
Step Change
Time
0%
100%
36.8%
Transmitter Output vs. Time
For line pressures above 2000 psi (13,7 MPa) and Ranges 4-5, see user manual (Rosemount publication number 00809-0100-4101).
Models Line Pressure Effect
2051CD Zero Error
(1)
Ranges 2-3 ±0.1% of URL/1000 psi (68,9 bar) for line pressures from 0 to 2000 psi (0 to 13,7 MPa)
Range 1 ±0.5% of URL/1000 psi (68,9 bar)
Span Error
Ranges 2-3 ±0.1% of reading/1000 psi (68,9 bar)
Range 1 ±0.4% of reading/1000 psi (68,9 bar)
(1) Can be calibrated out at line pressure.