material sensor (amplifier) for Trocen TF-6225

hi there,
I'm not sure, if this is a good place for this question, but hope it is.
I'd like o diagnose %subj if it's working well - I'm not sure, because I don't have a signal, so I'd like to know, where it should be connected to the TF-6225 board, how to measure (some impedance?) or how to order a new one - it's part of the TF-6225 board and I don't know if it is possible to buy it saparately - some order number and so on - I'm really trying my google-fu at the best, but still 404 - not found :-(
Thanks for any advice.