• When the span gas is removed from the sensor, the sensor
reading may take several minutes to return to zero; this is
normal sensor operation.
• If a CAL FAULT flag appears on the unit, this indicates:
• An unsuccessful attempt to calibrate the
Ultima/Ultima X Series Gas Monitor
• The Ultima/Ultima X Series Gas Monitor continues to
operate with the calibration parameters defined
before the calibration was attempted.
To extinguish the CAL FAULT flag, a complete calibration
procedure must be performed.
The Ultima/Ultima X Series Gas Monitor allows automatic zero and
span adjustments only within a pre-defined range. It cannot make
corrections outside this range, such as when an empty or wrong
cylinder of gas is applied, or if a user fails to begin gas flow within
the allotted 30-second countdown.
14.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.
NOTE: When using Cal Kit 54: after a successful calibration,
flush the flow control regulator and tubing with 100%
Nitrogen for five minutes. Return the flow control regulator
and tubing to the desiccated bag included in Cal Kit 54 or
equivalent dry container. Dedicate this flow control
regulator and tubing for HCL gas use only.
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 Ultima/Ultima X Series unit performs the zero
electronically. No calibration cap or zero gas is necessary.
To meet the specification stated, it is necessary to span the oxygen
Ultima/Ultima X Series Gas Monitor with the Calibration Kit and an
oxygen cylinder. The concentration of oxygen in air varies slightly due to
changing relative humidity and pressure levels. These variations in
oxygen levels are detected by the oxygen Ultima/Ultima X Series Gas
Monitor. To meet the reproducibility specification, it is necessary to use
a calibration gas cylinder. This ensures the same concentration of
oxygen for every calibration.
2-16
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