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Reference Manual
00809-0100-4444, Rev AC
Appendix A: Implementing a Universal Transmitter
January 2015
Implementing a Universal Transmitter
A.1.2 Three step process
There are three easy steps when implementing a universal transmitter.
1. Review the existing application. Verify the existing sensor is in good working order, and
that it is compatible with a universal transmitter. Use Tab le A- 1to help verify if the
Rosemount universal transmitter is compatible with the existing sensor. Verifying the
sensor is functioning correctly. While the universal transmitter may be able to drive the
existing sensor, if the sensor is not in good working order the universal transmitter may
not function correctly.
2. Connect the universal transmitter to the existing sensor using the wiring diagrams in
this appendix. If the existing sensor is not listed in this appendix, contact Rosemount
technical support for more details on the application of the universal capabilities.
3. Configure the transmitter following the guidelines in Section 4 and Section 5, setting
up parameters as needed. One of the key configuration parameters is the sensor
calibration number. There are several methods to determine the calibration number,
but the most common method will be to use the universal trim capability. This
functionality is detailed in this appendix. Accuracy of the meter when the universal trim
is used to determine the calibration number will be dependent on the accuracy of the
known flow rate used in the trim process.
In addition to the universal trim, there are two other methodologies for determining a
calibration number for the sensor.
Method 1: Have the sensor sent to a Rosemount service center for determination of a
calibration number compatible with the universal transmitter. This is the most accurate method
for determining the calibration number and will provide a ±0.5% of rate measurement accuracy
from 3 to 40 fps (1-10 m/s).
Method 2: Involves the conversion of the existing sensor calibration number/meter factors to
an equivalent Rosemount 16-digit calibration number. Accuracy of the meter using this
methodology is estimated to be in the range of 2-3%. Contact the Rosemount technical support
for more information on this method or to determine a calibration number for the existing
sensor.
Once these steps are completed, the meter will begin measuring flow. Verify the measured flow
rate is within the expected range and that the mA output correctly corresponds to the
measured flow rate. Also verify the reading in the control system matches the reading at the
transmitter. Once these items have been verified, the loop can be placed into automatic control
as needed.
Universal trim
The universal auto trim function enables the Rosemount 8732 to determine a calibration
number for sensors that were not calibrated at the Rosemount factory. The function is activated
as one step in a procedure known as in-process calibration. If the sensor has a 16-digit
Rosemount calibration number, in-process calibration is not required.
1. Determine the flow rate of the process fluid in the sensor.
LOI menu path
Fast keys
1, 2, 5, 5