Emerson Rosemount 3051S Series, Справочное руководство

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Reference Manual
00809-0100-4801, Rev FA
October 2010
3-13
Rosemount 3051S Series
BASIC SETUP
Set Process Variable
Units
The PV Unit command sets the process variable units to allow you to monitor
your process using the appropriate units of measure.
Field Communicator v3.3
Enter the fast key sequence “Set Process Variable Units.” Select from the
following engineering units:
AMS v7.0
Right click on the device and select “Configure” from the menu. In the Basic
Setup tab, use “Unit” drop down menu to select units.
Set Output
(Transfer function) The 3051S has two output settings: Linear and Square Root. Activate the
square root output option to make analog output proportional to flow. As input
approaches zero, the 3051S automatically switches to linear output in order to
ensure a more smooth, stable output near zero (see Figure 3-8).
From 0 to 0.6 percent of the ranged pressure input, the slope of the curve is
unity (y = x). This allows accurate calibration near zero. Greater slopes would
cause large changes in output (for small changes at input). From 0.6 percent
to 0.8 percent, curve slope equals 42 (y = 42x) to achieve continuous
transition from linear to square root at the transition point.
NOTE
If low flow cutoff configuration is desired, use “Scaled Variable Configuration”
on page 3-21 to configure square root and “Re-mapping” on page 3-24 to
map Scaled Variable as the primary variable.
If Scaled Variable is mapped as the primary variable and square root mode is
selected, ensure transfer function is set to linear.
Field Communicator v3.3
Enter the fast key sequence “Set Output (Transfer function).”
AMS v7.0
Right click on the device and select “Configure” from the menu.
1. In the Basic Setup tab, use “Xfer fnctn” drop down menu to select output,
click
Apply
.
2. After carefully reading the warning provided, select
yes
.
Traditional Fast Keys
1, 3, 2
Device Dashboard
Fast Keys
2, 2, 1, 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
Traditional Fast Keys 1, 3, 5
Device Dashboard
Fast Keys
2, 2, 1, 4