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Instable PT100 on cFP-RTD-122

We have PT100 sensors directly connected to a cFP-RTD-122 and have the problem of instable temperatures while calibrating the complete system and noise on the signal. With a ferrite filter on the powersupply cable we partly eliminated the noise but still have instable measurements while calibrating, i.e.. yesterday adjusted to 1°C now giving 2°C. Even differences are noticed between inputs on 1 board! What can be the problem?

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What type of cable you are using from sensor to Module?

What is the length?

 

Generally this happens because of Noise and can be removed with RC circuit on the terminals.

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