40
Reference Manual
00809-0100-4853, Rev AB
Operation and Maintenance
January 2017
Operation and Maintenance
Zero trim
To perform a DP sensor zero trim, select
Actions > Methods > Methods > Zero Differential Pressure Trim
and
follow the on-screen prompts. To perform a zero trim function, the measured value of transmitter can be
no larger than five percent of the upper sensor limit from zero.
Note
When performing a DP sensor zero trim, ensure that the equalizing valve is open and all wet legs are
filled to the correct levels.
Upper and lower sensor trim
Note
When performing a sensor trim on a pressure sensor, it is possible to degrade the performance of the
sensor if inaccurate calibration equipment is used. Use calibration equipment that is at least three times
as accurate as the pressure sensor of the Rosemount 3051SMV Transmitter.
A reference pressure device is required to perform a full sensor trim. Allow the pressure input to stabilize
for ten seconds before entering any values. To perform a DP full trim, select
Actions > Methods > Methods
> Lower Differential Pressure Trim
, follow the on-screen prompts, and then select
Actions > Methods >
Methods > Upper Differential Pressure Trim
and follow the on-screen prompts.
Note
The transmitter allows approximately five percent URL deviation from the characterized curve
established at the factory.
4.3.7
Static pressure sensor calibration
The static pressure calibration allows the user to complete either a zero trim procedure or a full SP sensor
trim. Static pressure sensor calibration units can be set in the Sensor Transducer Block.
Zero trim and lower sensor trim
A zero trim can be performed on a gage sensor and a lower sensor trim can be performed on an absolute
sensor to correct for mounting position effects. To perform a zero trim on a gage static pressure sensor,
select
Actions > Methods > Methods > Zero Static Pressure Trim
and follow the on-screen prompts.
To correct for mounting position effects on transmitters equipped with an absolute static pressure
sensor, perform a lower sensor trim. This is accomplished by selecting
Actions > Methods > Methods >
Lower Static Pressure Trim
and follow the on-screen prompts. The lower sensor trim function provides an
offset correction similar to the zero trim function, but it does not require a zero-based input.
Upper and lower sensor trim
Note
When performing a sensor trim on a pressure sensor, it is possible to degrade the performance of the
sensor if inaccurate calibration equipment is used. Use calibration equipment that is at least three times
as accurate as the pressure sensor of the Rosemount 3051SMV Transmitter.
A reference pressure device is required to perform a full sensor trim. Allow the pressure input to stabilize
for ten seconds before entering any values. To perform a SP full trim select
Actions > Methods > Methods >
Lower Static Pressure Trim
and follow the on-screen prompts then select
Actions > Methods > Methods >
Upper Static Pressure Trim
and follow the on-screen prompts.
Содержание Rosemount MultiVariable 3051SMV
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