Span calibration uses a known concentration gas to
determine the response of the sensor to the gas.
1. Attach the Calibration Adapter over the inlet port
on the front of unit by pressing it into place. Use a
fixed-flow regulator with a flowrate of preferably
about 0.3 to 0.5 LPM. Higher flowrates can be
used if necessary, but not lower. For reactive
gases, e.g., hydrogen chloride, hydrogen fluoride,
ozone, chlorine dioxide, phosphine, ammonia
and ethylene oxide, be sure to use Teflon tubing
connections.
2. Enter Config Mode and scroll to “SPAN?”
3. Start the gas flow, and press the Left key to start
the calibration countdown. The default count
time is 60 seconds, but some sensors will go
longer.
4. When finished, a “pass” or “fail” result will be
displayed. Turn off the gas supply, remove the
calibration adapter, and exit to Normal Mode.
5. To abort at any time during the count-down,
press the Right Key and “AbRT” is displayed.
