Rosemount Model 3144 and 3244MV Smart Temperature Transmitters
3-16
Output Trim or Scaled Output Trim
Perform an output trim or a scaled output trim to adjust the
transmitter’s digital-to-analog signal conversion (see Figure 3-2). The
output trim function calibrates the transmitter to a 4–20 mA reference
scale; the scaled output trim function calibrates to a user-selectable
reference scale. Perform a loop test to determine the need for an output
trim or a scaled output trim (see “Loop Test” on page 3-14).
Apply Values
Use the apply values function to adjust the interpretation of the
analog-to-digital signal conversion (see Figure 3-2), by applying the
upper and lower range values based on a scale of your choice.
Figure 3-2. Dynamics of Smart
Temperature Measurement.
Sensor Trim The Sensor Trim command allows you to digitally alter the
transmitter’s interpretation of the input signal as shown in Figure 3-2.
The sensor trim command trims, in engineering (°F, °C, °R, K) or raw
(Ω, mV) units, the combined sensor and transmitter system to a site
standard using a known temperature source. Sensor trim is suitable for
validation procedures or for applications that require calibrating the
sensor and transmitter together.
To perform a sensor trim with a Model 3144 or 3244MV transmitter,
perform the appropriate procedure:
Microprocessor
Digital-to-Analog
Signal Conversion
Analog-to-Digital
Signal Conversion
TRANSMITTER ELECTRONICS MODULE
Input Device
Output Device
HART
Communicator
HART Fast Keys 1,2,3,3
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