Thermocouples Junctions.

[reyamkram]

Hello,

I requested information on the type of thermocouples we have on our injection unit, I received a replay,

WE use unground J thermocouples, the shields are grounded,

Question----dose that mean the thermocouple junction is unground and one end of the shield is ground in the control box to the system ground, to act as a ground drip. the machine in question are Husky Hylectric models.

Thank you, for any and all information.

 

[LarryFine]

WE use unground J thermocouples, the shields are grounded,

Question----dose that mean the thermocouple junction is unground and one end of the shield is ground in the control box to the system ground, to act as a ground drip. the machine in question are Husky Hylectric models.

To me that means that neither of the T-couple wires are connected to the metallic housing or cable shield, but the housing and cable shield are connected together. I would guess that the shield should be grounded in the box.

 

[AdrianWint]

To me that means that neither of the T-couple wires are connected to the metallic housing or cable shield, but the housing and cable shield are connected together. I would guess that the shield should be grounded in the box.

I would agree.

 

[4x4dually]

Correct. The ungrounded thermocouple means the junction of the two wires in the probe are isolated from the sheath.

Visual stolen from the webs:

 

[petersonra]

Hello,

I requested information on the type of thermocouples we have on our injection unit, I received a replay,

WE use unground J thermocouples, the shields are grounded,

Question----dose that mean the thermocouple junction is unground and one end of the shield is ground in the control box to the system ground, to act as a ground drip. the machine in question are Husky Hylectric models.

Thank you, for any and all information.

what is a ground drip?

 

[LarryFine]

what is a ground drip?

I think it's what is called a drain wire, like the bare wire in contact with a foil shield, for easier terminating.

 

[reyamkram]

To me that means that neither of the T-couple wires are connected to the metallic housing or cable shield, but the housing and cable shield are connected together. I would guess that the shield should be grounded in the box.

Thank you for your reply

 

[garbo]

Hello,

I requested information on the type of thermocouples we have on our injection unit, I received a replay,

WE use unground J thermocouples, the shields are grounded,

Question----dose that mean the thermocouple junction is unground and one end of the shield is ground in the control box to the system ground, to act as a ground drip. the machine in question are Husky Hylectric models.

Thank you, for any and all information.

At an injection plant & large candy company that I worked out the The thermocouple wires were never grounded. Was taught to only ground one end of shield on cables. If you ground both ends the shield might carry current.

 

[reyamkram]

At an injection plant & large candy company that I worked out the The thermocouple wires were never grounded. Was taught to only ground one end of shield on cables. If you ground both ends the shield might carry current.

Thank you for your reply,

 

[zbang]

Was taught to only ground one end of shield on cables. If you ground both ends the shield might carry current.

Taught the same here- it's a shield, not a circuit conductor (this applies to a lot of things, including audio systems).