Section
5-1
5
Specifications and
Reference Data
SPECIFICATIONS
Functional Specifications
Inputs
User-selectable (see Table 5-1 on page 5-10)
Output
Two-wire 4–20 mA, linear with temperature or linear with input.
Digital output signal superimposed on 4–20 mA signal, available for
HART communicator or control system interface.
Isolation
Input/output isolation tested up to 500 V rms (707 V dc)
Power Supply
External power supply required. Transmitters operate on 12.0 to
42.4 V dc transmitter terminal voltage (with 250 ohm load, 17.75 V dc
power supply is required). Transmitter power terminals rated to
42.4 V dc.
Indication
Optional five-digit LCD meter includes 0–100% bar graph. Digits are
0.4 inches (8 mm) high. Display options include engineering units (°F,
°C, °R, K, ohms, and millivolts), percent, and milliamps. The display
can also be set to alternate between engineering units/milliamps,
Sensor 1/Sensor 2, and Sensor 1/Sensor 2/Differential Temperature. All
display options, including the decimal point, may be reconfigured in the
field using a Model 275 HART Communicator or AMS.
ROSEMOUNT CONFORMANCE TO SPECIFICATIONS
–3
s
+3
s
–2
s
–1
s
+2
s
+1
s
Lower
Specification
Limit
Upper
Specification
Limit
Typical Accuracy
You can be confident that a Rosemount product not only meets
our published specifications, but probably exceeds them. Our
advanced manufacturing techniques and use of Statistical
Process Control provide specification conformance to at least
± 3
σ
(1)
. In addition, our commitment to continual improvement
ensures that product design, reliability, and performance get
better every year.
For example, the Reference Accuracy distribution for the Models
3144 and 3244MV Temperature Transmitters is shown to the
right
(2)
. Our Specification Limits are ±0.10 °C, but, as the shaded
area shows, approximately 68% of the units perform three times
better than the limits. Therefore, it is very likely that you will
receive a device that performs much better than our published
specifications.
Conversely, a vendor who “grades” product without using
Process Control, or who is not committed to ±3
σ
performance,
will ship a much higher percentage of units that are barely within
(or even outside of) advertised specification limits.
(1) Sigma (
σ)
is the Standard Deviation of a statistical distribution, and
describes the dispersion (spread) of the distribution.
(2) Accuracy distribution shown is for Model 3144 and 3244MV
transmitters, Pt 100 RTD sensor, Range 0 to 100 °C.