Emerson Process Management 2051 manual Long Term Stability, Dynamic Performance, Rosemount

Rosemount 2051

Reference Manual

00809-0200-4101, Rev AA July 2008

Long Term Stability

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).

Dynamic Performance

4 - 20 mA HART(1)
1-5 Vdc HART Lower Power(1) Fieldbus(3)	Typical HART Transmitter Response Time
Total Response Time (Td + Tc)(2):

2051C, Range 3-5:	115 milliseconds	152 milliseconds
Range 1:	270 milliseconds	307 milliseconds
Range 2:	130 milliseconds	152 milliseconds
2051T:	100 milliseconds	152 milliseconds
2051L:	See Instrument Toolkit®	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.

Transmitter Output vs. Time
Pressure Released
Td	Tc	Td = Dead Time
		Tc = Time Constant
100%
		Response Time = Td+Tc
36.8%		63.2% of Total
		Step Change
0%	Time

Line Pressure Effect per 1000 psi (6,9 MPa)

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.

A-2