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Rosemount 3051N
Sensor Temperature
HART Comm.
BASIC SETUP
Set Process Variable
Units
HART Comm.
Set Output
HART Comm.
2-8
NOTE
Regardless of the range points, the Rosemount 3051N will measure and
report all readings within the digital limits of the sensor. For example, if the
4 and 20 mA points are set to 0 and 10 in H
3051N, and the transmitter detects a pressure of 25 inH
the 25 inH
2
to ±5.0% error associated with output outside of the range points.
The Rosemount 3051N contains a temperature sensor just above its pressure
sensor in the sensor module. When reading this temperature, keep in mind
1, 1, 4
that this is not a process temperature reading.
The PV Unit command sets the process variable units to allow you to monitor
your process using the appropriate units of measure. Select from the following
engineering units:
1, 3, 2
•
inH
2
•
inHg
•
ftH
2
•
mmH
•
mmHg
•
psi
•
torr
•
inH
2
Activate the transmitter square root output option to make the analog output
proportional to flow. As the input approaches zero, the Rosemount 3051N
1, 3, 5
automatically switches to a linear output in order to ensure a more smooth,
stable output near zero. See Figure 2-5.
The transition from linear to square root is not adjustable. It occurs at 0.8% of
ranged pressure input or 8.9% of full-scale flow output.
From 0 percent 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, the slope of the curve equals 42 (y = 42x) to
achieve continuous transition from linear to square root at the transition point.
O reading and a 250% of span reading. However, there may be up
O
O
O
2
O at 4 °C
Reference Manual
00809-0100-4808, Rev CA
O on a range code 1 Rosemount
2
O, it digitally outputs
2
•
bar
•
mbar
2
•
g/cm
2
•
kg/cm
•
Pa
•
kPa
•
atm
•
mmH
O at 4 °C
2
June 2008
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