Rosemount Model 444 Alphaline Temperature Transmitters
2-6The correct connections for a compensation loop RTD and a 2-wire RTD are shown in Figure 2-6c and Figure 2-6d, respectively. In a 2-wire RTD, however, both leads are in series with the sensor element, so significant errors (0.1 °C) could occur if the lead lengths are greater than one foot. For longer runs when using a 2-wire RTD, attach a third lead and connect as shown in Figure 2-6a.

FIGURE 2-6.Sensor Wiring Diagrams.

FIGURE 2-7. Characteristicsof Thermocouple and RTD Input Wires.

–+
Signal
Model 444with 3-Wire RTD
Figure 2-6a Model 444 with 4-Wire RTD
Figure 2-6b Model444 with 2-Wire RTD
Figure 2-6d
Model444 with
Comp.Loop RTD
Figure 2-6c
Model444LL or 444LM
with 3-Wire RTD
Figure 2-6e Model 444MVwith Millivolt
Inputor Model 444T Series
withG roundedor
UngroundedThermocouple
Figure 2-6f
Model 444MVused as
DifferentialMillivolt
Transmitter( T/C Junctions
mustbe ungrounded)
Figure 2-6g
–+
Signal
–+
Signal
–+
Signal
Jumper
+ Output Common–
Signal –+
Signal –+
Signal
White
Red
Red
White
Red
Red
White
White
Red
Black
Black
White
Red
High T/C Low T/C
++ ––
–+
–+
White
Red
Red
444-0203A;B;C;D
Single Element RTD Compensation Loop RTD Dual Element RTD
Red
Red
White
White
Red
Black
White
Black
Red
White
White
Black
Green
Green
Thermocouple Type PositiveLead Negative Lead
J Iron (Magnetic) Constantan (Non-magnetic)
K Chromel (Non-magnetic) Alumel (Magnetic)
T Copper(Yellow color) Constantan (Silver color)
E Chromel (Shinym etal) Constantan (Dull metal)
R Platinum13% Rho dium Platinum
S Platinum10% Rho dium Platinum
444-0207A