Thermal Conductivity Detector reads gas composition by measuring difference in thermal conductivity between reference gas stream and sample gas stream. This ensures consistent, safe blends. Dual pass sampling system enables analysis of gas combinations easily. Analyzer operates at 0.5 scfh. Min gas supply is 2-3 psi; max gas supply, 100 psi. Options includes 2 and 4 relay output cards, RS232/485 cards, and 0-10 V or 4-20 mA outputs.