Emerson 3051S Specifications Page 86

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Reference Manual
00809-0100-4001, Rev JA
Section 4: Operation and Maintenance
November 2012
Operation and maintenance
Step 2: Determine the operating conditions.
Step 3: Calculate total probable error (TPE).
Step 4: Calculate the stability per month.
Step 5: Calculate calibration frequency.
4.3.2 Choosing a trim procedure
To decide which trim procedure to use, you must first determine whether the analog-to-digital
section or the digital-to-analog section of the transmitter electronics need calibration. Refer to
Figure 4-1 and perform the following procedure:
1. Connect a pressure source, a Field Communicator or AMS, and a digital readout device
to the transmitter.
2. Establish communication between the transmitter and the Field Communicator.
3. Apply pressure equal to the upper range point pressure.
4. Compare the applied pressure to the pressure process variable valve on the Process
Variables menu on the Field Communicator or the Process Variables screen in AMS. For
instructions on how to access process variables, see page 51 of Section 3:
Configuration.
Transmitter: 3051CD, Range 2 [URL=250 inH
2
O(623 mbar)]
Calibrated Span: 150 inH
2
O (374 mbar)
Ambient Temperature Change: ± 50 °F (28 °C)
Line Pressure: 500 psig (34,5 bar)
TPE = = 0.105% of span
Where:
Reference Accuracy = ± 0.04% of span
Ambient Temperature Effect =
Span Static Pressure Effect
(1)
=
(1)Zero static pressure effect removed by zero trimming at line pressure.
ReferenceAccuracy
2
TemperatureEffect
2
StaticPressureEffect
2
++
0.0125 URL¥
Span
------------------------------------- 0.0625+


% per 50 °F 0.0833% of span=
0.1% reading per 1000 psi (69 bar) 0.05% of span at maximum span=
Stability
0.125 URL¥
Span
---------------------------------------
% of span for 5 years 0.0035% of span per month==
Cal. Freq.
Req. Performance TPE
Stability per Month
-----------------------------------------------------------------------
0.3% 0.105%
0.0035%
--------------------------------------------- 27xmonths===
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