Emerson 4500 Manuale Utente
Reference Manual
00809-0100-4027, Rev AA
December 2005
Rosemount 4500
3-8
BASIC SETUP
Set Process Variable
Units
Units
The PV Unit command sets the process variable units to allow you to monitor
your process using the appropriate units of measure.
your process using the appropriate units of measure.
HART Communicator
Enter the fast key sequence for “Set Process Variable Units.” Select from the
following engineering units:
following engineering units:
AMS
Right click on the device and select “Configuration Properties” from the menu.
In the Basic Setup tab, use “Unit” drop down menu to select units.
In the Basic Setup tab, use “Unit” drop down menu to select units.
Rerange
The Range Values command sets the 4 and 20 mA points (lower and upper
range values). In practice, you may reset the transmitter range values as
often as necessary to reflect changing process conditions. Changing the
lower or upper range point results in similar changes to the span.
range values). In practice, you may reset the transmitter range values as
often as necessary to reflect changing process conditions. Changing the
lower or upper range point results in similar changes to the span.
NOTE
Transmitters are shipped from Rosemount Inc. fully calibrated per request or
to the factory default of full scale (span = upper range limit.)
Transmitters are shipped from Rosemount Inc. fully calibrated per request or
to the factory default of full scale (span = upper range limit.)
Use one of the methods below to rerange the transmitter. Each method is
unique; examine all options closely before deciding which method works best
for your process.
unique; examine all options closely before deciding which method works best
for your process.
•
Rerange with a HART Communicator only.
•
Rerange with a pressure input source and a HART Communicator.
•
Rerange with a pressure input source and the local zero and span
buttons (option D1).
buttons (option D1).
•
Rerange with AMS only.
•
Rerange with a pressure input source and AMS.
NOTE
If the transmitter security switch is ON, adjustments to the zero and span
cannot be made. Refer to “Set Switches” on page 2-5 for security information.
If the transmitter security switch is ON, adjustments to the zero and span
cannot be made. Refer to “Set Switches” on page 2-5 for security information.
Fast Keys
1, 3, 2
•
inH
2
O
•
bar
•
torr
•
inHg
•
mbar
•
atm
•
ftH
2
O
•
g/cm
2
•
MPa
•
mmH
2
O
•
kg/cm
2
•
inH
2
O at 4 °C
•
mmHg
•
Pa
•
mmH
2
O at 4 °C
•
psi
•
kPa