114
Reference Manual
00809-0200-4840, Rev BA
December 2014
Appendix A: Reference Data
A.1.9
Temperature and pressure ratings
The process temperature and process pressure rating depends on the design of the transmitter
in combination with the flange materials.
Figure A-1. Graph of process temperature versus process pressure ratings
A.1.10
Load limitations
A Field Communicator requires a minimum load resistance of 250 Ohm within the loop in order
to function properly. Communication with a Rosemount 3490 Series Control Unit does not
require additional resistance. The load resistance can be determined from these diagrams:
Note
R = Maximum Load Resistance
U = External Power Supply Voltage
(1) The Rosemount 3108 forms part of an MCERTS certified system when used with a Rosemount 3490 Series Control Unit.
Pressure
psi (bar)
140 °F
(60 °C)
-40 °F
(-40 °C)
-4 psi
(-0,25 bar)
44 psi
(3 bar)
OPERATING RANGE
The final rating may be limited by
flange selection
Temperature
°F (°C)
Process Temperature and Pressure Chart for the Rosemount 3107 and 3108
Non-Intrinsically Safe Installations
Intrinsically Safe Installations
R (Ohms)
R (Ohms)
U (V)
U (V)
12
12
30
40
1244
800
400
0
20
30
20
1244
800
400
0
25
0
250
53
3
53
3
0
Rosemount 3107 and Rosemount 3108
24
18
18
24
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