Control Data Center if the Ultima Plus Digital Network option
was purchased.
More frequent calibration may be required when the unit is new.
Calibration frequency depends on operating time and chemical
exposures of the instrument. Also perform calibration when
installing or changing the power source of the control
instrumentation. In some cases, it may be necessary to perform
only a zero function of the Gas Monitor in lieu of a full zero and
span procedure. Check with your safety officer or safety engineer
to determine if only a zero function is necessary.
NOTES:
• If the sensor element has been changed or replaced, see
Chapter 3, "Initial Calibration."
• If this is an oxygen sensor, see Chapter 3, "Oxygen Calibration."
• Before calibrating Chlorine, Nitrogen Dioxide, Hydrogen
Chloride, Chlorine Dioxide, or Hydrogen Cyanide, apply power
to the unit at least 1/2-hour before calibrating.
• Due to the unstable nature of Chlorine Dioxide (ClO
2
), Chlorine
gas is used as a calibration simulant. If using the MSA
calibration system and gas cylinder (P/N 710331), the response
ratio is 2:1 (the 2-ppm sample of Chlorine should be set to read
1 ppm of ClO
2
). The default value for the calibration gas on the
ClO
2
Toxgard II Gas Monitor is 1 ppm.
To Zero the Toxgard II Gas Monitor Only
NOTE: Combustible sensor configurations are only available
with a remote sensor; side-mount and bottom-
mount sensors are not available in a combustible
sensor configuration.
Identify your Toxgard II Gas Monitor and select the proper one of
the following two zeroing calibration procedures.
• Use Procedure Number 1 to zero your unit for the following gases:
• Carbon Monoxide
• Oxygen
• Hydrogen Sulfide
• Sulfur Dioxide
• Hydrogen Chloride
• Nitric Oxide
• All Combustible gases.
Chapter 3, Calibration
3-7
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