Emerson Rosemount 3051S Reference Manual page 50

Rosemount 3051S ERS System
4-4
1. Vent the P / P
HI LO
2. Wait for the P / P
HI
3. Using AMS or a field communicator, perform the zero trim function on the
P / P sensor.
HI LO
Upper and Lower Sensor Trims
Sensor trim is a two-point sensor calibration where lower and upper end-point
pressures are applied, and all readings are linearized between the two points.
Always perform a lower sensor trim first to establish the correct offset. The
upper sensor trim provides a slope correction to the sensor characterization
curve based on the lower sensor trim value. The trim values allow for the
optimization of performance over a specified measurement range.
NOTE
Use a pressure reference source that is at least three times more accurate
than the actual transmitter sensor, and allow the input pressure to stabilize for
a minimum of ten seconds prior to entering any values.
To perform a two-point sensor trim on the P
procedure below:
1. Launch the "Lower Sensor Trim" function using AMS or a Field
Communicator.
2. Physically apply the desired low pressure value to the P
using a reference pressure device such as a high-accuracy dead-weight
tester.
3. Wait for the P / P
HI
4. When prompted by AMS or the Field Communicator, define the amount
of pressure that was applied to the P
5. Launch the "Upper Sensor Trim" function using AMS or a Field
Communicator.
6. Physically apply the desired high-pressure value to the P
using a reference pressure device such as a high-accuracy dead-weight
tester.
7. Wait for the P / P
HI
8. When prompted by AMS or the Field Communicator, define the amount
of pressure that was applied to the P
sensor to atmosphere.
pressure measurement to stabilize.
LO
or P
HI
pressure measurement to stabilize.
LO
/ P
HI LO
pressure measurement to stabilize.
LO
/ P
HI LO
Reference Manual
00809-0100-4804, Rev AA
January 2011
sensor, follow the
LO
/ P sensor
HI LO
sensor.
/ P sensor
HI LO
sensor.