What does 2-, 3- and 4-wire connection mean?

A resistance temperature detector (=RTD) can be connected with 2, 3 or 4 wires. The 2-wire connection needs only 2 wires, but then the measuring electronics is measuring also wire resistance, which is not desirable. Using extra wires for compensating the cable resistance gives more precisely the desired resistance of the RTD itself. The 4-wire connection is the most accurate one.

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Precise temperature measurement is vital for vaccine transportation. One must get immediate information, if the temperature level fluctuates. For example, most vaccines for COVID-19 must be stored...

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Update 25.3.2020

Dear customers, 

The Corona virus epidemic still has no significant impact on our performance. Products stored in Finland we continue delivering within the normal delivery times....

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Our customer service and sales will be closed throughout the Christmas week, December 23-27.
From Monday December 30 onward, it's business as usual again.

Please send your orders to us no later than...

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