Determining Calibration Frequency - Emerson Rosemount 2051 Reference Manual

Section 5: Operation and Maintenance
April 2013
All configuration changes should be monitored by a display or by measuring the loop output.
Figure 5-1
Figure 5-1. Local Configuration Button options
A. Local Operator Interface - green retainer
B. Digital Zero Trim- blue retainer
5.4.2

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.
1.
2.
3.
4.
5.
Sample calculation for Rosemount 2051
Step 1: Determine the performance required for your application.
Required Performance:
Step 2: Determine the operating conditions.
Transmitter:
Calibrated Span:
Ambient Temperature Change:
Line Pressure:
68
shows the physical differences between the two sets of buttons.
A
Determine the performance required for your application.
Determine the operating conditions.
Calculate the Total Probable Error (TPE).
Calculate the stability per month.
Calculate the calibration frequency.
0.30% of span
Rosemount 2051CD, Range 2 [URL=250 inH
150 inH O (374 mbar)
2
± 50 °F (28 °C)
500 psig (34,5 bar)
Reference Manual
00809-0100-4107, Rev BA
B
O(623 mbar)]
2
Operation and Maintenance