Impact / Impact Pro / Impact Pro IR Operating Instructions
43
Ensure that the Span Calibration Setting matches that of the gas concentration
being applied. If not, press the button to change the setting. See Section 4.9.2.3
for instructions.
The following table gives the current set allowable range of Span Gas
Concentrations:
Gas Type Allowable Range
Methane (catalytic sensor) 20% LEL to 100% LEL
Carbon Monoxide 50 ppm to 500 ppm
Hydrogen Sulde 15 ppm to 50 ppm
Carbon Dioxide 0.5% v/v to 2.1% v/v
Chlorine 2 ppm to 10 ppm
Ammonia 10 ppm to 100 ppm
Gas Type Allowable Range
Sulfur Dioxide 5 ppm to 20 ppm
Nitrogen Dioxide 5 ppm to 20 ppm
Methane (%LEL IR) 20% LEL to 100% LEL
Methane (%v/v IR) 40% v/v to 60% v/v
Carbon Dioxide (%v/v IR) 0.5% v/v to 3% v/v
If calibrating the electrochemical CO
2
channel, turn on the gas 2 minutes before
pressing the 3 button.
After pressing the 3 button the instrument will display
this message while spanning the sensor.
Once the span is complete the instrument will display whether the span was
successful.
Span
OK
Press to continue�
Span
Fail
Presstocontinue�
or
If the span was unsuccessful repeat the span ensuring that the calibration gas used
is of the correct concentration, there is sufficient gas in the cylinder and that the flow
rate is correct. If a second failure occurs contact local service center or Honeywell
Analytics for assistance. If the calibration is successful, the unit will automatically
update the next calibration required by date by the predefined calibration interval
value (default 180 days).
Note:
If the ’Hard Zero’ is omitted then the calibration is retained only for the
current session and the calibration date will not be updated.
4.9.2.3 Calibration Gas Settings
WARNING
Verify that the concentration shown on the calibration gas settings screen is the
same as the concentration printed on the label of the calibration gas cylinder
that will be used. Using the wrong concentration may cause incorrect adjustment
during calibration procedures, and lead to dangerously inaccurate readings during
normal operation.
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