Determining Calibration Frequency - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0100-4107
5.5

Determining calibration frequency

Calibration frequency can vary greatly depending on the application, performance
requirements, and process conditions. Use the following procedure to determine
calibration frequency that meets the needs of your application.
Procedure
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.
5.5.1 Sample calculation for Rosemount 2051
Procedure
1. Determine the performance required for your application.
2. Determine the operating conditions.
3. Calculate total probable error (TPE).
TPE =
of span
Where:
Reference Manual
Required Performance
Transmitter
Calibrated Span
Ambient Temperature
Change
Line Pressure
Reference ± 0.065% of span
Accuracy =
Ambient
Temperature
Effect =
Span Static
Pressure
Effect=
Operation and Maintenance
0.30% of span
Rosemount 2051CD, Range 2 [URL=250
inH O(623 mbar)]
2
150 inH O (374 mbar)
2
± 50 °F (28 °C)
500 psig (34,5 bar)
September 2020
= 0.189%
83