begin gas flow within the allotted 30-second
countdown occurs.
16. After a successful calibration, remove the tubing from the
Flow Controller and remove the Flow Controller from the
cylinder; return all items to their appropriate location in the
Calibration Kit.
OXYGEN Calibration
NOTE: If this is the first calibration after the sensor element is
replaced, perform an "Initial Calibration."
Oxygen calibration is slightly different from other gases. When
the ZERO function is performed, the 30-second countdown is
omitted because the Toxgard II unit performs the zero
electronically. No calibration cap or zero gas is necessary.
To meet the stated specification, it is necessary to span the
Oxygen Toxgard II Gas Monitor with the Calibration Kit and an
oxygen cylinder. The concentration of oxygen-in-air varies slightly
due to changing relative humidity levels. These variations in
oxygen levels are detected by the oxygen Toxgard II Gas
Monitor. To meet the reproducibility specification, a calibration
gas cylinder must be used to ensure the same oxygen
concentration for every calibration.
25% Oxygen Toxgard II Gas Monitor
For the SPAN function, ambient air is generally adequate for
the 25% oxygen Toxgard II Gas Monitor as the expected default
span value is 20.8%. Therefore, when the display prompts
"APPLY SPAN GAS" it would be adequate to simply allow the
countdown to occur without applying gas.
NOTE: If the sensor is located in an area of normally low or
enriched oxygen, then a 20.8% oxygen sample
must be applied when the display prompts: "APPLY
SPAN GAS".
INITIAL Calibration
When a new sensor element is placed in the sensor, an INITIAL
Calibration must be performed. This procedure enables the unit
to gather data about the sensor to make accurate decisions for
the CHANGE SENSOR function and the CAL FAULT function to
work properly.
The INITIAL calibration is accomplished by aiming and
pressing the ZERO and CALIBRATE buttons of the calibrator
Chapter 3, Calibration
3-25
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