Reference Manual
00809-0100-4738, Rev DA
May 2006
4-18
Rosemount 3095FB
Figure 4-16. Offset and Slope Trim Screens
3.
DP Offset (zero) and Slope (span) Trim
a. Select DP from the Sensor Selection heading, and click Offset and
Slope Trim.
b. Enter the Offset Trim Point and Slope Trim Point values that will be
applied by a reference device, and click Trim.
c. Using a deadweight tester, apply the desired offset trim value (low
pressure value) to only the high side of the transmitter. Wait for the
measured value to stabilize, and click OK.
d. Using a deadweight tester, apply the desired slope trim value (high
pressure value) to only the high side of the transmitter. Wait for the
measured value to stabilize, and click OK.
4.
PT Offset (zero) and Slope (span) Trim
a. Select PT from the Sensor Selection heading, and click Offset and
Slope Trim.
b. Enter the Offset Trim Point and Slope Trim Point values that will be
applied, and click Trim.
c. Insert the RTD probe into an ice bath. Wait for the measured value
to stabilize, and click OK.
d. Insert the RTD probe into a hot oil bath. Wait for the measured
value to stabilize, and click OK.
NOTE
A calibrated decade box can be used instead of the ice bath and the hot oil
bath. However, trim results may not be as accurate since the RTD probe is not
used in the trim procedure.
5.
Return the transmitter to service by closing the equalize valves and
opening the block valves.
NOTE
To protect the sensor module, do NOT close the bypass valve on the manifold
until after process pressure has been reapplied. This keeps one side of the
DP sensor from being subjected to high pressure while the other side has no
pressure applied.
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