Emerson Rosemount 3051CF Series Reference Manual page 95

Reference Manual
00809-0100-4774
For transmitters that are field installed, the manifolds discussed in
allow the differential transmitter to be zeroed using the zero trim function.
operation
eliminates any pressure offsets caused by mounting effects (head effect of the oil fill) and
static pressure effects of the process.
Determine the necessary trims with the following steps.
Procedure
1. Apply pressure.
2. Check the pressure, if the pressure does not match the applied pressure, perform a
3. Check reported analog output against the live analog output. If they do not match,
5.3.2 Determine calibration frequency
Calibration frequency can vary greatly depending on the application, performance
requirements, and process conditions. To determine calibration frequency:
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.
Sample calculation for Rosemount 3051 (0.04 percent
accuracy and five-year stability)
The following is an example of how to calculate calibration frequency.
Procedure
1. Determine the performance required for your application.
2. Determine the operating conditions.
Reference Manual
discusses both three-valve and five-valve manifolds. This field calibration
sensor trim.
See Perform a calibration or sensor
perform an analog output trim.
See Performing digital-to-analog trim (4-20 mA output
Required Performance:
Transmitter
Calibrated span
Ambient temperature change
trim.
0.20% of span
Rosemount 3051CD, Range 2 [URL=250 inH
(623 mbar)]
150 inH O (374 mbar)
2
± 50 °F (28 °C)
Operation and maintenance
July 2020
Manifold operation
Manifold
trim).
O
2
95