Operation
2-5
In a 4-wire connection, terminals 2 and 3 are high impedance inputs. Thus, no current
flows through those wires and no voltage drop is caused. The resistance of the other two
wires is not of interest, since there is no measurement registered on them. Hence the
voltage V2 is directly proportional to the RTD resistance.
(V2 = RTD x I)
Figure 2.5 - Four - Wire Connection
A differential or dual channel connection is similar to the two-wire connection and gives
the same problem (See
Figure 2.6 - Differential or Dual Connection
). The resistance of
the wires will be measured and do not cancel each other out in a temperature
measurement, since linearization will affect them differently.
Figure 2.6 - Differential or Dual Connection
TT2EM206.CDR
TT2EM205.CDR
Summary of Contents for TT302
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Page 11: ...Installation 1 5 Figure 1 5 Tree Topology TT2EM105 CDR ...
Page 12: ...TT302 Fieldbus Temperature Transmitter 1 6 ...
Page 18: ...TT302 Fieldbus Temperature Transmitter 2 6 ...
Page 32: ...TT302 Fieldbus Temperature Transmitter 3 14 ...
Page 38: ...TT302 Fieldbus Temperature Transmitter 4 6 ...
