A771 TPI Carbon Monoxide Accessory For DMM's - The A771 is an advanced state-of-the-art Carbon Monoxide monitor that may be used to measure levels of carbon monoxide (CO) in the parts per million (ppm) range when used with a digital multimeter (DMM).
National Ambient Air Quality Primary Standards in the US call for less then 9 ppm carbon monoxide for an 8 hour average during any 12 month period.
Concentrations of 1 to 2 ppm may be found in homes with a normally operating gas furnace to well over 1,000 ppm in homes with a faulty furnace.
Just 200 ppm CO over 2 to 3 hours can cause slight headache, fatigue, dizziness, and nausea.
Carbon Monoxide testing is a crucial service provided by HVAC/R technicians.
