The Toxgard II Gas Monitor allows automatic zero and span
adjustments only within a pre-defined range. It cannot
make any corrections outside this range, such as when an
empty or wrong cylinder of gas is applied or failure to
begin gas flow within the allotted 30-second
countdown occurs.
Spanning
• If this is the first calibration after the sensor element is replaced,
refer to "Initial Calibration."
• If this is an oxygen sensor, refer to "Oxygen Calibration."
5. The Toxgard II Gas Monitor automatically begins the span
countdown after a successful zeroing of the unit. The
span countdown is also 30 seconds (FIGURE 3-13).
• The span process can be aborted at any time during the
countdown by simply pressing any button on the
Calibrator while aiming it at the unit or by pressing the
internal push-button.
6. Turn OFF the zero gas and remove the flow controller if
used previously.
7. Locate the span gas cylinder and the .25 LPM Flow
Controller (P/N 478359).
8. Screw the Flow Controller onto the top of the span
gas cylinder.
9. Locate the Tube Assembly (P/N 711112).
10. Push the smaller end of the Tube Assembly over the gas
outlet of the Flow Controller.
• Ensure that the tubing completely covers the gas outlet
(FIGURE 3-7).
11. Locate the calibration cap (P/N 710411) and push the
tubing through the hole in the bottom of the cap.
12. Connect the other end of the tubing over the Sensor inlet
and push the calibration cap over the entire sensor inlet
(FIGURE 3-17).
13. Turn ON the gas flow by turning the flow controller knob.
• Notice the open arrow on the knob of the flow controller.
• If a CAL FAULT indication is on the Toxgard II Gas
Monitor display before the user is able to apply the gas
(FIGURE 3-11), a steady state gas condition existed for
longer than 15 seconds; this caused the unit to use a
wrong reading as a span indication.
Chapter 3, Calibration
3-23
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