Emerson Rosemount 1408A, Справочное руководство

Страница: 63 / 90

7.5.5 Calibrate analog out
Use this function to calibrate the analog output by comparing the actual output current
with the nominal 4 mA and 20 mA currents. Calibration is done at factory and the analog
output does not normally need to be recalibrated.
Prerequisites
Connect a calibrated ampere meter to the analog output loop.
Procedure
1. Under Menu , select Parameter
→
Service Tools
→
Analog Out Calibration .
2. Perform the calibration of 4 mA.
a) Select Enter 4 mA Fixed Current Mode to set the analog out to 4 mA.
b) Measure the analog output with the ampere meter.
c) In the 4 mA Measured Current box, enter the measured current.
d) Select Write to device .
e) Select Calibrate 4 mA .
f) Measure the analog output with the ampere meter and verify it is within
4±0.01 mA.
3. Perform the calibration of 20 mA.
a) Select
Enter 20 mA Fixed Current Mode
to set the analog out to 20 mA.
b) Measure the analog output with the ampere meter.
c) In the 20 mA Measured Current box, enter the measured current.
d) Select Write to device .
e) Select Calibrate 20 mA .
f) Measure the analog output with the ampere meter and verify it is within
20±0.01 mA.
4. Select Exit Fixed Current Mode .
7.6 Service support
To expedite the return process outside of the United States, contact the nearest Emerson
representative.
Within the United States, call the Emerson Instrument and Valve Response Center using
the 1-800-654-RSMT (7768) toll-free number. This center, available 24 hours a day, will
assist you with any needed information or materials.
The center will ask for product model and serial numbers, and will provide a Return
Material Authorization (RMA) number. The center will also ask for the process material to
which the product was last exposed.
Reference Manual Service and troubleshooting
00809-0200-4480 May 2021
Reference Manual 63