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Reference Manual
00809-0100-4808, Rev CA
June 2008
Rosemount 3051N
2-18
Full Trim To calibrate the sensor with a HART Communicator using the full trim
function, perform the following procedure:
1. Assemble and power the entire calibration system including a
transmitter, HART Communicator, power supply, pressure input
source, and readout device (see Figure 2-9).
NOTE
Use a pressure input source with sufficient accuracy and allow the input
pressure to stabilize for 10 seconds before entering any values.
2. From the communicator menu select 1 Device setup, 2 Diagnostics
and service, 3 Calibration, 3Sensor trim, 2 Lower sensor trim to
prepare to adjust the lower trim point.
NOTE
Select pressure input values so that the low and high values are equal to or
outside the 4 and 20 mA points. Do not attempt to obtain reverse output by
reversing the high and low points. The transmitter allows approximately a
5% URL deviation from the characterized curve established at the factory.
3. Follow the commands provided by the communicator to complete the
adjustment of the lower value.
4. Repeat the procedure for the upper value, replacing 2 Lower sensor
trim with 3 Upper sensor trim in Step 2.
FIGURE 2-9. Digital Trim
Connection Drawing (4–20 mA
Transmitters).
HART Comm. 1, 2, 3, 3
250 Ω Minimum Loop
Resistance
Rosemount 3051N
Transmitter
Precision Meter
24 V dc Power Supply
HART-Based
Communicator
Rosemount 275 or
Rosemount 375
Dead Weight Tester
Calibration Standard for
Sensor Trim Only