4. After the 30 second countdown:
• The display alternates between "CAL" and a value
(example: 0 PPM). This value is the actual reading of the
gas concentration the sensor is detecting.
• Once the gas value on the display is stable for 15
seconds, the alternating display stops. If the calibration is
successful, the display will show END and 0
(FIGURE 3-10)
a. If Using the Zero Cap: remove it.
b. If Using a Zero Gas Cylinder:
1) Turn OFF the gas flow by turning the flow
controller knob.
2) Remove the tubing from the Sensor inlet.
• If the calibration signal is enabled during calibration,
it will be held at the lockout value for an additional
two minutes.
c. If a CAL FAULT flag appears on the unit (FIGURE 3-11),
this indicates:
• An unsuccessful attempt to zero or calibrate the
Toxgard II Gas Monitor
• The Toxgard II Gas Monitor is operating with the
calibration parameters defined before the calibration
was attempted.
To extinguish the CAL FAULT flag, a complete calibration
procedure must be performed.
The Toxgard II Gas Monitor allows automatic zero
adjustment 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.
5. If Using Zero Gas:
After a successful zeroing, 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.
Chapter 3, Calibration
3-14
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