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)

• Rerange (page 3-8)

• Set Damping (page 3-10)

Calibrate the sensor

• Full Trim (page 4-6)

• Zero Trim (page 4-6)

Calibrate the 4–20 mA output

• 4–20 mA Output Trim (page 4-8); or

• 4–20 mA Output Trim Using Other Scale (page 4-9)

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.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 69 70

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