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Emerson 4500 User Manual

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Page of 70
Reference Manual
00809-0100-4027, Rev AA
December 2005
Rosemount 4500
4-2
Table 4-1.  Recommended 
Calibration Tasks
NOTE:
The transmitter performs to specification only when completely and correctly 
calibrated, including full sensor and analog output trim.
Calibration Overview
Complete calibration of the 4500 pressure transmitter involves the following 
tasks:
Configure the output parameters
•
Set Process Variable Units (page 3-7)
•
Set Output Type (page 3-8)
•
•
Calibrate the sensor
•
•
Calibrate the 4–20 mA output
•
4–20 mA Output Trim (page 4-8); or
•
Figure 4-1 on page 4-3 illustrates 4500 transmitter data flow. Data flow can be 
summarized in four major steps:
1. A change in pressure is measured by a change in the sensor output 
(Sensor Signal).
2. The sensor signal is converted to a digital format that is understood by 
the microprocessor (Analog-to-Digital Signal Conversion). 
3. Corrections are performed in the microprocessor to obtain a digital 
representation of the process input (Digital PV). 
4. The Digital PV is converted to an analog value (Digital-to-Analog Signal 
Conversion).
Transmitter
Bench Calibration Tasks
Field Calibration Tasks
4500_ G
4500_ A
1. Set output configuration parameters:
a. Set the range points.
b. Set the output units.
c. Set the output type.
d. Set the damping value.
2. Optional: Perform a full sensor trim if 
equipment available (accurate pressure 
source required), otherwise perform the 
low trim value section of the full sensor 
trim procedure.
3. Optional: Perform an analog output trim 
(Accurate multimeter required)
1. Reconfigure parameters if necessary.
2. Perform low trim value section of the 
full sensor trim procedure to correct for 
mounting position effects.