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Reference Manual
00809-0100-4665, Rev AA
August 2010
4-11
Rosemount 8732
Universal Trim
The Universal Trim function enables the Rosemount 8732E 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 Trim function.
3. When the routine is completed, the sensor is ready for use.
Auto Zero
The Auto Zero function initializes the transmitter for use with the 37 Hz coil
drive mode only. Run this function only with the transmitter and sensor
installed in the process. The sensor must be filled with process fluid at zero
flow. Before running the Auto Zero function, be sure the coil drive mode is set
to 37 Hz (Auto Zero will not run with the coil drive frequency set at 5 Hz).
Set the loop to manual if necessary and begin the Auto Zero procedure. The
transmitter completes the procedure automatically in about 90 seconds. A
symbol appears in the lower right-hand corner of the display to indicate that
the procedure is running.
Master Reset
The master reset is a function that the user can execute to reset the device
configuration to the default setting.
There are three types of Master Reset:
Cold Start - Reset the device to a default configuration. The device address is
not changed.
Warm Start - Restart the device. This reset function acts just like a power
cycle. None of the configuration parameters are changed.
Reset Address - This reset changes the bus address of the device to the
default address of 126. This change happens immediately regardless of the
state of data exchange the transmitter is in.