Reference Manual
00809-0100-4022, Rev AA
July 2002
Model 4600
4-2
Table 4-1. Recommended
Calibration Tasks
Calibration Overview
Complete calibration of the Model 4600 Oil & Gas transmitter involves the
following tasks:
Configure the output parameters
• Set Process Variable Units (page 3-6)
• Rerange (page 3-7)
• Set Damping (page 3-9)
Calibrate the sensor
• Full Trim (page 4-7)
• Zero Trim (page 4-6)
Calibrate the 4–20 mA output
• 4–20 mA Output Trim (page 4-9); or
• 4–20 mA Output Trim Using Other Scale (page 4-11)
Figure 4-1 on page 4-3 illustrates Model 4600 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).
Figure 4-1 also identifies the approximate transmitter location for each
calibration task. Data flows from left to right, and a parameter change affects
all values to the right of the changed parameter.
Transmitter
Bench Calibration Tasks
Field Calibration Tasks
Model 4600G
Model 4600A
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 absolute
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.
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