Input Options
“2”
&
"3"
RTD
-
2 Wire
Terminals 12
-
14
ModeI#98
_A-2_
_0-0000
98_A-3_
_0-0000
Jumper#l3to#l4
II
II
.
.
.
.
.
.
Input Options
“2”
&
"3"
RTD
-
3 Wire
Terminals
12
-
14
Model#
98_
A-2_ _ 0-0000
98_A-3_
_0-0000
.
.
.
.
.
.
-
J
NOTE:
Long lead lengths create electrical resistance. There will be a
S
approximate
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 a three wire
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).
Figure 12
-
Input Options "2" &
“3”,
RTD (2
wire)
Sensor
Wiring.
Figure 13
-
Input Options
“2’
&
‘*3”,
RTD (3 wire)
Sensor Wiring.
Install and Wire, Chapter 2
WATLOW Series
980/985
User's
Manual
15