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Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
4-34
Universal Auto Trim
The universal auto trim function enables the Rosemount 8712 to calibrate
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 your
Rosemount sensor has a 16-digit calibration number, in-process calibration is
not required. If it does not, or if your sensor is made by another manufacturer,
complete the following steps for in-process calibration.
1.
Determine the flow rate of the process fluid in the sensor.
NOTE
The flow rate in the line can be determined by using another sensor in the
line, by counting the revolutions of a centrifugal pump, or by performing a
bucket test to determine how fast a given volume is filled by the process fluid.
2.
Complete the universal auto trim function.
3.
When the routine is completed, the sensor is ready for use.
Device Info
Information variables are used for identification of Flowmeters in the field and
to store information that may be useful in service situations. Information
variables have no effect on flowmeter output or process variables.
Manufacturer
Manufacturer is an informational variable provided by the factory. For the
Rosemount 8712, the Manufacturer is Rosemount.
Tag
Tag is the quickest variable to identify and distinguish between flowmeters.
Flowmeters can be tagged according to the requirements of your application.
The tag may be up to eight characters long.
Descriptor
Descriptor is a longer user-defined variable to assist with more specific
identification of the particular flowmeter. It is usually used in multi-flowmeter
environments and provides 16 characters.
Message
The message variable provides an even longer user-defined variable for
identification and other purposes. It provides 32 characters of information and
is stored with the other configuration data.
Date
Date is a user-defined variable that provides a place to save a date, typically
used to store the last date that the transmitter configuration was changed.
Field Comm.
1, 4, 5
LOI Key
AUX. FUNCTION
Field Comm.
1, 4, 6
LOI Key
XMTR INFO
Field Comm.
1, 4, 6, 1
LOI Key
XMTR INFO
Field Comm.
1, 4, 6, 2
LOI Key
XMTR INFO
Field Comm.
1, 4, 6, 3
LOI Key
XMTR INFO
Field Comm.
1, 4, 6, 4
LOI Key
XMTR INFO
Field Comm.
1, 4, 6, 5
LOI Key
XMTR INFO
Summary of Contents for 8712
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