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Thermocouple Data Logger TC-08 - Input Channel Isolation

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Thermocouple Data Logger TC-08 - Input Channel Isolation

Postby lightsphere » Thu May 07, 2015 2:11 pm

As a cannot find the answer in the products data sheets. Can you tell me if the 8 input channels of the TC-08 are isolated against each other?

We need to sample temperatures from a metal pipe where we apply 8 thermocouples type-k to the same pipe which then is heated up. Most dataloggers we found so far, have no isolation of their input channels against each other which leads to interference of the temperature measurements if there is a common ground.

Thanks for any advice.
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Re: Thermocouple Data Logger TC-08 - Input Channel Isolation

Postby Gerry » Tue May 12, 2015 4:27 pm

Hi Lightsphere,

The TC-08 channels are not isolated from each other they have weak pull down resistors, and capacitors that are tied to ground.

Best regards,

Gerry
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Re: Thermocouple Data Logger TC-08 - Input Channel Isolation

Postby alan » Tue May 12, 2015 5:47 pm

Hi,

Just to add to this, the inputs are differential with a 7.5V common mode voltage. To put this another way as long as there is no more than ±7.5V between the thermocouples you will be OK. As you mention they are connected to the same pipe it seems unlikely there would be more than a few mV voltage drop along the pipe so it should be OK.
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