Emerson 3051S Specifications Page 85

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75
Reference Manual
00809-0100-4001, Rev JA
Section 4: Operation and Maintenance
November 2012
Operation and maintenance
1. Determine the performance required for your application.
2. Determine the operating conditions.
3. Calculate the Total Probable Error (TPE).
4. Calculate the stability per month.
5. Calculate the calibration frequency.
Sample calculation for a standard 3051C
Step 1: Determine the performance required for your application.
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.
Sample calculation for 3051C with P8 option
(0.04% accuracy & 5-year stability)
Step 1: Determine the performance required for your application.
Required Performance: 0.30% of span
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 = = 0.117% of span
Where:
Reference Accuracy = ± 0.065% of span
Ambient Temperature Effect =
Span Static Pressure Effect
(1)
=
(1)Zero static pressure effect removed by zero trimming at line pressure.
Required Performance: 0.30% of span
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
-----------------------------------------------------------------------
0.30% 0.117%
0.0035%
------------------------------------------------- 52months===
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