Internal sample and air pumps with extended lifetime; up to three times longer service interval than air eductor pumps All sample wetted components made from high-quality stainless steel All sample wetted components in fully heated oven chamber @ 190°C (374°F) with µ-processor temperature controller Extended Lifetime fully heated stainless steel sample filter (2µm mesh) with sample filter backpurge system; allows filter to be cleaned without dismantling Integrated solenoid valves for sample, zero gas, span gas and backpurge Overflow calibration system (except Models 3-200 & 5-100) Remote control for sample, calibrate and backpurge modes Built in Burner Air Supply; no extra bottles for combustion air needed Low fuel consumption Flame Out indicator with alarm contact 0-10V and 4-20mA recorder output Models VE 7, 3-300A & 3-200 are fully approved for EPA method 25A, EPA Method 503, 17. BImSchV, 13. BImSchV & 2.BImSchV All 19" rack mount analyzers feature our new ruggedized aluminum body construction