# grounded or ungrounded

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#### Fred Chwalek

I have a Watlow Anafaze temperature controller. The spec states that I should use all grounded or all ungrounded thermocouples. We have a box full of used and assorted thermocouples. How can I tell if they are "grounded" or "ungrounded" and what exactly does that mean? I think it means the thermocouple is isolated from the sheath. Is there an easy way to test this? Fred Chwalek Applications Engineer Beacon E-Commerce, eFilter Division Voice: (704) 398-7916 Fax: (704) 398-7822 Email: [email protected]

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#### IP OMER BIN ABDUL AZIZ

Hello Fred! The sheath of a thermocouple cable is usually connected to ground at one end. You will have to check if they are grounded at the thermocouple end in the field or at the control panel end. If the sheath is hanging un-connected at the both ends, the termocouple cable would be ungrounded. The sheath does not come in contact with the thermocouple (grounded or ungrounded). It only serves as a 'shield' against EMI for the signal passing through the cable. Clear skies! Omer

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