Implementing a Universal Transmitter
March 2016
Reference Manual
00809-0300-4750, Rev CA
222
Implementing a Universal Transmitter
D.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
to 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
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 to 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 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 that 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 8750W Transmitter 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.
LOI menu path
Field Mount: Device Setup, Detailed Setup, Additional Params, Universal
Auto Trim
Wall Mount: AUX. FUNCTION
Fast Keys
1, 2, 5, 5
Summary of Contents for Rosemount 8750W
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