CAI Model 701LX NDIR Gas Analyzer or Equivalent The Government requires a California Analytical Instruments, Inc. Model 701LX NDIR gas analyzer. The Government is currently operating an intrinsic safe... CAI Model 701LX NDIR Gas Analyzer or Equivalent The Government requires a California Analytical Instruments, Inc. Model 701LX NDIR gas analyzer. The Government is currently operating an intrinsic safety approval laboratory using outdated and/or deteriorated gas analyzing equipment. This equipment is used in the approval of mining equipment which is instrumental to the safety of miners.