Watlow CLS - Manual (Page 48)

40 CLS User’s Guide
Installation
You can connect J, K, T, S, R, B, and E thermocouples directly to the
CLS. Watlow Anafaze provides standard linearization and cold junction
compensation for these thermocouple types. (Other thermocouple types
require custom linearization; please contact Watlow Anafaze for more
information about them.)
Connecting Thermocouples
Connect the positive T/C lead to the In+ terminal. Connect the negative
T/C lead to the TB1 In- (4 or 8CLS) or analog common 16CLS)(
terminal. A typical thermocouple connection is shown in the figure
below.
• Use 20 gauge thermocouple extension wire for all thermocouple
inputs.
• If you use shielded wire, tie it to panel ground or to ground at the
measurement end.
RTD Inputs (4 and 8 CLS only)
The standard industrial RTD is an 100-ohm, 3-wire platinum assembly
as shown in the figure below. Watlow Anafaze highly recommends that
you use the 3-wire RTD to prevent reading errors due to cable
resistance.
• If you order an RTD1 or RTD2 configuration, Watlow Anafaze will
configure your CLS for the standard 3-wire RTD.
• If you must use a 4-wire RTD, leave the fourth wire unconnected.
Watlow Anafaze offers 2 standard DIN 385 curve RTD input ranges, as
shown here:
RTD Ranges in Degrees
Name Temp. Range
in ºF Temp.
Range in
º C
Resolution Measurement
Temperature Error @ 25
º C Ambient
Error @ 0-50
º C Ambient
RTD1 -148.0 to
527.0 ºF -100.0 to
275.0
º C
0.023 º C 25 º C ±0.35 ºC ±0.5 ºC
275 º C ± 1 ºC ±1.5 ºC
RTD2 -184 to 1544
ºF -120 to 840
º C
0.062 º C 25 º C ±0.9 ºC ±2.8 ºC
840 º C ±1.1 ºC ±4.3 ºC
White
Red
Type J T/C
IN +
IN
–
Case
Shield (if present)
Frame Ground