A refrigerating and heat device has a compressor, a four-way valve, three heat exchangers, a switching component, and a plurality of pipes connecting these elements. The AD converter is configured to receive and sample an analog signal from the ion detector thereby providing a plurality of samples. Output-side voltage relaxing transistors have sources connected to output nodes, gates connected to a first output reference node, and drains connected to drains of the input-side voltage relaxing transistors. The second angle is greater than the first angle.