Environmental Systems Products (ESP) has signed an agreement with Praxair for the supply of precisely mixed, automotive inspection and maintenance calibration gases though 2006.

ESP uses the gas mixtures to calibrate its analysers that measure vehicle exhaust emissions. Praxair support more than 12,000 ESP emissions analysers in 12 U.S. states and one Canadian Province with speciality gases.

Praxair’s environmental marketing manager, John Ottosen said, “We’ve been manufacturing precision calibration gases for 30 years, and during this time the analysers have become more sophisticated and the requirements for the gases more accurate and complex. As emissions testing increases and industries need more help to meet ever-stricter environmental regulations, we’re working with customers like ESP to develop better ways for them to measure emissions more accurately.”

Praxair mix carbon monoxide, carbon dioxide, propane and nitric oxide with nitrogen in non-refillable cylinders. Every 72 hours, ESP’s computer-controlled analyser requires calibration with gases certified by the Bureau of Automotive Repair (BAR).

Equipment calibration ensures the accuracy of each and every vehicle inspection, and the integrity of the vehicle-inspection program.