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Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
4-16
Universal 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.
Status
Status displays a summary of the health of the transmitter. If there are any
alerts or error messages that have activated, they will be listed here.
ADVANCED
CONFIGURATION
In addition to the basic configuration options and the diagnostic information
and controls, the 8712 has many advanced functions that can also be
configured as required by the application.
DETAILED SETUP
The detailed setup function provides access to other parameters within the
transmitter that can be configured such as coil drive frequency, output
parameters, local display configuration, and other general information about
the device.
Additional Parameters
The additional parameters menu provides a means to configure optional
parameters within the 8712 transmitter.
Coil Drive Frequency
Coil drive frequency allows pulse-rate selection of the sensor coils.
5 Hz
The standard coil drive frequency is 5 Hz, which is sufficient for nearly all
applications.
37 Hz
If the process fluid causes a noisy or unstable output, increase the coil drive
frequency to 37 Hz. If the 37 Hz mode is selected, perform the auto zero
function.
Field Comm.
1, 2, 5, 5
LOI Key
AUX. FUNCTION
Field Comm.
1, 2, 6
LOI Key
XMTR INFO
Field Comm.
1, 4
Field Comm.
1, 4, 1
Field Comm.
1, 4, 1, 1
LOI Key
AUX. FUNCTION
Summary of Contents for 8712
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