How to Calibrate the Oxycheq O2

Knowing the exact oxygen content of the air you breathe may seem like too much information. That is, until you fill a scuba tank with it and start inhaling it underwater. While many recreational divers breathe pure air from scuba tanks, divers who venture below 130 feet, known as technical divers, often breathe a carefully composed gas mixture consisting of oxygen and another gas, usually helium. This reduces the risk of decompression caused by excessive amounts of nitrogen or oxygen toxicity from excessive oxygen. Accurate measurement of the proportion of oxygen in the gas mixture is life-critical at those depths. The OxyCheq O2 analyzer measures the oxygen content of both pure air and gas mixture tanks. It is battery-powered and all electronics are sealed in a rugged, splash-proof ABS case. The OxyCheq O2 should be calibrated before each use.

Instructions

  1. Calibration For Pure Air

    • 1

      Turn the power switch to "On."

    • 2

      Remove the sensor plug and the sensor cap from the sensor on the front panel.

    • 3

      Allow the unit to sense clean air for one minute.

    • 4

      Adjust the calibration knob on the front panel so the LED display reads 20.9 percent.

    Calibration For Oxygen Mixtures Above 50 percent

    • 5

      Attach the sensor flow cap to the sensor on the front panel.

    • 6

      Connect a tank of 100 percent oxygen from a certified provider to the sensor flow cap. Adjust the valve on the tank so the flow rate is between 0.5 and 2 liters per minute.

    • 7

      Wait for the reading on the LED to stabilize.

    • 8

      Adjust the calibration knob so the LED display reads 100 percent.