Patent ID: 6997347

Claim:
An apparatus for providing calibration gas to a gas monitoring instrument, comprising: a calibration gas source comprising a miniature gas cylinder containing a calibration gas, and including a pierceable seal or open/close valve; an outlet for providing test gas to the monitoring instrument; and a gas conduit for providing diluted cylinder gas to the outlet, the gas conduit comprising: a receptacle means for receiving the miniature gas cylinder in gas-tight manner, and including means for rupturing the seal or opening the valve; a manifold; pressure transducer means for determining pressure of the gas in the conduit; a valve for releasing the gas into the gas conduit; a micro orifice for providing a controlled flow of calibration gas in the conduit; means for diluting gas in the conduit with air; and control means for releasing test gas to the conduit upon determination of sufficient pressure in the manifold.