Watlow Micro-Based Autotuning Control SERIES 980/985 User Manual page 15

Input Options "2" & " 3 " RTD - 2 Wire
Terminals 12 - 14
ModeI#98 _ A - 2 _ _0-0000
98_A-3_ _0-0000
Jumper#l3to#l4
Input Options "2" & " 3 " RTD - 3 Wire
Terminals 12 - 14
Model# 98_A-2_ _ 0-0000
98_A-3_ _0-0000
NOTE:
Long lead lengths create electrical resistance. There will be
input error for every 1ohm of lead length resistance when using a two wire RTD.
That resistance, when added to the resistance of the RTD element, can result in
erroneous input to the instrument. To overcome this problem, use
RTD sensor, which compensates for lead length resistance. When extension wire
is used for a three wire RTD, all three extension wires must have the same
electrical resistance. (i.e. same gauge, copper stranded).
Install and Wire, Chapter 2
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a S
1° approximate
Figure 12 -
Input Options "2" &
"3", RTD (2 wire)
Sensor Wiring.
Figure 13 -
Input Options "2' &
'*3", RTD (3 wire)
Sensor Wiring.
a
three wire
WATLOW Series 980/985 User's Manual
15