Watlow CAS - Manual (Page 36)

26 CAS User’s Guide
Installation
T/C Inputs
WARNING
Since the CAS has single ended inputs, it has little protectection
from common mode voltage sources. Therefore Watlow
Anafaze highly recommends that you use ungrounded therm-
couples with the EXTERNAL THERMOCOUPLE SHEATH
ELECTRICALLY CONNECTED TO EARTH GROUND.
You can connect J, K, T, S, R, B, PL-II, and N thermocouples directly to
the CAS. 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 analog common terminal on the CAS. The next
figure shows a typical thermocouple connection.
• Use 20 gauge T/C extension wire for all T/C inputs.
• If you use shielded wire, tie it to panel ground or to ground at the
measurement end
Current Inputs
To connect current (milliamp) inputs, install resistors that convert the
milliamp input to a voltage. Watlow Anafaze offers resistors for 0-20
mA and 0-10 mA current inputs.