Emerson Rosemount 3051S Reference Manual page 52

Rosemount 3051S ERS System
Analog Output Trim
3, 4, 1, 1
Fast Keys
Recall Factory Trim
3, 4, 1, 2
Analog Output
3, 4, 2, 2
DP
3, 4, 3, 2
P Sensor
HI
3, 4, 4, 2
P Sensor
LO
4-6
To perform a two-point DP trim, follow the procedure below:
1. Launch the "Lower DP Trim" function using AMS or a Field
Communicator.
2. Physically apply the desired low DP value to the entire ERS system. This
may require the use of two separate reference pressure devices.
3. Wait for the DP value to stabilize.
4. When prompted by AMS or the Field Communicator, define the amount
of DP that was applied to the ERS system.
5. Launch the "Upper DP Trim" function using AMS or a Field
Communicator.
6. Physically apply the desired high DP value to the entire ERS system.
This may require the use of two separate reference pressure devices.
7. Wait for the DP value to stabilize.
8. When prompted by AMS or the Field Communicator, define the amount
of DP that was applied to the ERS system.
The Analog Output Trim command allows for the adjustment of the 4-20 mA
output of the ERS system to match a plant or control system standard. This
command only impacts the digital-to-analog conversion that drives the analog
output and does not affect the actual DP calculation.
To perform an Analog Output trim, follow the procedure below:
1. Launch the "Analog Trim" function using AMS or a Field Communicator.
2. Connect a reference milliamp meter to the 4-20 mA output of the ERS
Primary sensor. Connect the positive lead to the positive terminal and the
negative lead to the test terminal.
3. The "Analog Trim" function will then force the analog output of the ERS
system to 4 mA. Enter the mA reading from the reference meter when
prompted.
4. The mA output of the 3051S ERS system will be adjusted based on the
value that was entered from Step 3.
a. If the reference meter still does not read "4 mA," select "NO," and
repeat Step 3.
b. If the reference meter now reads "4 mA," select "YES" and
continue on to Step 5.
5. Repeat steps 3 and 4 for the 20 mA output.
The Recall Factory Trim command allows the restoration of the as-shipped
factory settings of the analog output, DP, and the P
calibrations. This command can be useful for recovering from an inadvertent
trim or an inaccurate pressure source.
Reference Manual
00809-0100-4804, Rev AA
January 2011
and P sensor
HI LO