Performing a Zero Calibration

On the Sensor Calibration page, select “Zero Hydrogen”.  Turn the valve on the side of the enclosure to the “Calibration Gas” position, and attach the Zero gas to the “Calibration Gas Inlet” port.  Begin the flow of gas at a rate of 1.5 to 2.0 SCFH as measured on the flow meter on the door of the enclosure.  The gas should not be under any pressure other than the amount required to maintain the appropriate flow amount.  The target Value is shown on the screen.  For a Zero Calibration, this will be 0.00 (the amount of Hydrogen in the Zero Gas).  The Measured H₂ Value can be seen at the bottom of the screen. When this value comes to equilibrium, it will not be showing any upward or downward trends, only the slight oscillation of the readings.  This usually occurs in approximately 30 seconds.  When the sensor is at equilibrium, press the green “Calibrate” button to perform the zero calibration.  After the Zero Calibration is complete, turn off the flow of gas and disconnect it from the enclosure.