Effectively monitor compressed air systems with the CDI meter. This flow meter includes two probes, one warmer than the other. This arrangement calculates mass velocity based on heat requirements. Additionally, pipe area data is used to determine flow amounts. Requires analog port selection during U30 system or RX3000 configuration and use of a S-FS-CVIA when using the H22-001 data logger. When using a UX120-006M, ZW Series or U12 data logger, this sensor requires a 4-20mA input cable (CABLE-4-20mA).