Step 5: Trim The Transmitter - Emerson Rosemount 3095FB MultiVariable MODBUS Quick Installation Manual

Quick Installation Guide
00825-0100-4738, Rev BA
October 2009
S 5: T
TEP RIM THE
NOTE
Transmitters are shipped from Emerson Process Management, Rosemount Division fully
calibrated per request or by the factory default of full scale.
Zero Offset Trim
A zero trim is a single-point adjustment used for compensating mounting position effects.
When performing a zero trim, ensure the low side block valve is closed, the equalize valve is
open, the high side block valve is open, and all wet legs are filled to the correct level.
If zero offset is less than 3% of true zero, follow the user interface software instructions
below.
Trim DP Offset (Zero)
1. Click Maintenance, Sensor Trim on the taskbar.
2. Click DP option.
3. click Offset Trim option.
4. Enter the offset trim point to trim DP Offset (Zero)
5. Click Trim to complete the sensor trim
Trim SP Offset (Zero) (AP, GP)
1. When performing a offset or zero SP trim, ensure the low side block valve is closed, the
equalize valve is open, and the high side block valve is closed. Then, open vent to
atmosphere.
2. Click Maintenance, Sensor Trim on the taskbar.
3. Click SP option.
4. click Offset Trim option.
5. If using GP type sensor, enter zero.
If using AP type sensor, do not zero. Instead, enter an Offset value based on a
barometric pressure reading.
NOTE
For Absolute Pressure (AP) Sensor: If open to atmosphere, reading should be at
atmospheric pressure (roughly 12 - 15 psi (0.8 – 1.0 bar), not zero. Use a barometer that is
four times as accurate as the Rosemount 3095 AP sensor.
6. Click Trim to complete the sensor trim.
7. Once the offset or zero SP trim is complete, verify that vent is closed, the high side block
valve is open, close the equalize valve tightly, then open the low side block valve.
T
RANSMITTER
Rosemount 3095FB
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