Figure
10
-
Input Options
“1”,
**2*
&
*3’,
Thermo-
couple Wiring
Diagram.
Flgure
11
-
Input Options
"2"
&
"3"
Process Input
Wlring
Diagram.
1
NOTE:
When using a
4-
2OmA
process
Input, the input
impedance is
2 4 9 o h m s
lnput Options
“1
“,
“2”
&
“3”,
Thermocouple Input
Terminals 18 & 20
Model
#
98
– A - 1 _ _ - 0-0000
98_A-2 – –
0-0000
98_A-3-
0-0000
– –

II

II

I
1
NOTE:
You must use an isolated or ungrounded thermocouple if an external
4-20mA
output device with a non-isolated circuit common is connected to the
4-20mA
output.
Extenslon wire for thermocouples must be of the same alloy as the thermocouple
itself to limit errors.
These input connections
are used in conjunction with your units sensor
type. (Thermocouple and RTD only)
Input Options
“2’
&
“3”,
Process or Remote Set Point Input
Terminals
15
-
17
Model
#98_A - 2 _ _ 0 - 0000
98_A - 3 _ _ 0 - 0000
0
II
Jumper Terminal 16
to Terminal
17
when
using a
4-20mA
input.
.

fl

0-5VDC
4-20mA
INPUT
16
17
0-5VDC,
4-20mA
INPUT
Input
Voltage
J3
NOTE:
When using a process input such
as
O-5VDC
or
4-2OmA,
the
rL
and
rH
settings
scale the display to match the measured range of the process signal. When using
a
0-5VDC
process input, the input impedance is 100K ohms.
An example of this is: A pressure transducer operates over a range of 0
-
300 PSI,
delivering a
4-20mA
output signal for this range. By setting rL= 0 and
rH
=
300,
the Series
980/985
is now displayed as a direct reading of pressure.
14
WATLOW
Series
980/985
User’s Manual
Install and Wire, Chapter 2