Emerson 3051S Specifications Page 96

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86
Reference Manual
00809-0100-4001, Rev JA
Section 4: Operation and Maintenance
November 2012
Operation and maintenance
Example
A Range 4 transmitter with model number 3051_CD4 will be used in a differential pressure
application where the static line pressure is 1200 psi (83 bar). The transmitter output is ranged
with 4 mA at 500 inH
2
O (1,2 bar) and 20 mA at 1500 inH
2
O (3,7 bar).
To correct for systematic error caused by high static line pressure, first use the following
formulas to determine corrected values for the low trim and high trim.
Low Trim Value
LT = LRV - (S/100 x P/1000 x LRV)
In this example:
High Trim Value
HT = (URV - (S/100 x P/1000 x URV)
In this example:
Complete the Sensor Trim procedure as described on page 83. In the example above, at step 4,
apply the nominal pressure value of 500 inH
2
O. However, enter the calculated correct lower
trim (LT) value of 506 inH
2
O with the Field Communicator. Repeat the procedure for the upper
value.
Where: LT = Corrected Low Trim Value
LRV = Lower Range Value
S = Span shift per specification (as a percent of reading)
P = Static Line Pressure in psi
LRV = 500 inH
2
O (1.24 bar)
S = -1.00%
P = 1200 psi
LT = 500 inH
2
O - (-1%/100 x 1200 psi/1000 x 500 inH
2
O)
LT = 506 inH
2
O
Where: HT = Corrected High Trim Value
URV = Upper Range Value
S = Span shift per specification (as a percent of reading)
P = Static Line Pressure in psi
URV = 1500 inH
2
O (3.74 bar)
S = -1.00%
P = 1200 psi
HT = 1500 - (-1%/100 x 1200 psi/1000 x 1500 inH
2
O)
HT = 1518 inH
2
O
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