The Model 905 design incorporates a long-life, heavy duty maintenance free sensor. The sensor is totally sealed, operates at room
temperature and is internally compensated for slight temperature variations. Unlike other sensors, it is not dependent on a controlled
flow rate for accuracy, is not heated and is not affected by hydrocarbon gases. For sampling food packs, the needle tip of the sample
probe is inserted into the food pack through a foam seal pad with adhesive on one side, providing a tight seal so that air cannot leak
into the package through the puncture hole. The PUMP switch is depressed, sample is drawn from the package to the sensor and the
reading obtained on the display. The pump turns off automatically after the short sampling period.