Temperature of grain, feed stored in silos needs to be monitored for maintaining quality of the stored medium. Monitoring of the total volume of the silo is needed to provide information on accidental quality loss or appearance of germs or fungus. Eventual temperature increases will alert the operator to perform operation or recycling the medium. Temperature measurement is done by electronic temperature sensors placed at equal distances in a coated stainless steel flexible tube. Each sensor sends the actual measured temperature of its environment to the transmitter head. The transmitter head communicates through HART protocol with control room devices. The output is a 2-wire system the communication is only digital.