Emerson 3051S Specifications Page 82

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72
Reference Manual
00809-0100-4001, Rev JA
Section 4: Operation and Maintenance
November 2012
Operation and maintenance
4.2.1 Warnings
4.3 Calibration overview
Calibration is defined as the process required to optimize transmitter accuracy over a specific
range by adjusting the factory sensor characterization curve located in the microprocessor.
Possible procedures are:
Reranging: Setting the lower and upper range points (4 and 20 mA or 1 and 5 Vdc)
points at required pressures. Reranging does not change the factory sensor
characterization curve. Refer to page 53.
Analog Output Trim: Adjusts the transmitter’s analog characterization curve to match
the plant standard of the control loop. There are two types of digital-to-analog output
trims. Refer to page 77.
Digital-to-Analog Output Trim on 4-20 mA HART output (page 77)
Digital-to-Analog Output Trim on 4-20 mA HART output Using Other Scale
(page 79)
Sensor Trim: Adjusts the position of the factory sensor characterization curve due to a
change in the sensor characteristics over time or a change in test equipment. Trimming
has two steps, zero and sensor trims. Refer to page 82 and page 83.
Zero Trim (page 82)
Sensor Trim (page 83)
Explosions could result in death or serious injury:
Installation of this transmitter in an explosive environment must be in accordance with the
appropriate local, national, and international standards, codes, and practices. Please review
the approvals section of the 3051 reference manual for any restrictions associated with a
safe installation.
Before connecting a Field Communicator in an explosive atmosphere, ensure the
instruments in the loop are installed in accordance with intrinsically safe or
non-incendive field wiring practices.
In an Explosion-Proof/Flameproof installation, do not remove the transmitter covers
when power is applied to the unit.
Process leaks may cause harm or result in death.
Install and tighten process connectors before applying pressure.
Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage that may be present on leads
can cause electrical shock.
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