11.6.3
Digital trim
LOI menu path
Diagnostics > Trims > Digital Trim
Digital trim is the function by which the factory calibrates the transmitter. This procedure
is rarely needed by users. It is only necessary if the transmitter is suspected to be no longer
accurate. A Rosemount 8714D Calibration Standard is required to complete a digital trim.
Attempting a digital trim without a Rosemount 8714D Calibration Standard may result in
an inaccurate transmitter or an error message. The digital trim must be performed with
the coil drive mode set to 5Hz and with a nominal sensor calibration number stored in the
memory.
Note
Attempting a digital trim without a Rosemount 8714D Calibration Standard may result in an
inaccurate transmitter, or a “DIGITAL TRIM FAILURE” message may appear. If this message occurs,
no values were changed in the transmitter. Simply cycle power on the transmitter to clear the
message.
To simulate a nominal sensor with the Rosemount 8714D Calibration Standard, change/
verify the following five parameters in the transmitter:
•
Calibration Number-1000015010000000
•
Units-ft/s
•
PV URV-20mA = 30.00 ft/s
•
PV LRV-4mA = 0 ft/s
•
Coil Drive Frequency-5Hz
Before changing any of the configuration parameters, be sure to record the original values
so that the transmitter can be returned to the original configuration prior to being placed
back into operation. Failure to return the settings to the original configuration will result in
incorrect flow and totalizer readings.
The instructions for changing the calibration number, units, PV URV, and PV LRV are
located in
. Instructions for changing the coil drive frequency can be found on
.
Set the loop to manual (if necessary) and then complete the following steps:
Procedure
1.
Power down the transmitter.
2.
Connect the transmitter to a Rosemount 8714D Calibration Standard.
3.
Power up the transmitter with the Rosemount 8714D connected and read the flow
rate.
The electronics need about a 5-minute warm-up time to stabilize.
4.
Set the 8714D Calibration Standard to the 30 ft/s (9.1 m/s) setting.
Maintenance
150
Rosemount
®
8732EM Transmitter with HART Protocol Reference Manual
Содержание Rosemount 8732EM
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Страница 6: ...Contents iv Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 10: ...Safety messages 4 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 14: ...Introduction 8 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 30: ...Sensor Installation 24 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 87: ...Field Communicator Dashboard Menu Tree HART v5 4 part 2 Figure 7 8 Operation Reference manual 81 ...
Страница 92: ...Operation 86 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 138: ...Advanced Diagnostics Configuration 132 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 158: ...Maintenance 152 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 214: ...Product Certifications 208 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 217: ...Wiring 8732EM using combination cable Figure C 2 Wiring Diagrams Reference manual 211 ...
Страница 221: ...Wiring Diagram 475 Field Communicator with 8732EM External Analog Power Figure C 6 Wiring Diagrams Reference manual 215 ...
Страница 222: ...Wiring Diagrams 216 Rosemount 8732EM Transmitter with HART Protocol Reference Manual ...
Страница 253: ...Implementing a Universal Transmitter Reference manual 247 ...