Set Calibration Gas; Set Span Value - WatchGas NEO User Manual

User Manual

7.1.5 SET CALIBRATION GAS

Calibration to the gas normally measured by the instrument increases accuracy.
To set calibration gas:
1. Enter the Set Cal. Gas menu.
2. Select from Gas Library or Custom Gases.
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3. Use and
OK
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4. Press to select a gas.
5. Press to save and exit.
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Calibrating the instrument to the gas you are measuring increases the accuracy of detection
Note that calibrating the instrument to a single gas will not make the instrument respond to
A PID instrument is a broad range detection device that shows calculated concentrations based

7.1.6 SET SPAN VALUE

Sets the concentration value that the instrument expects when performing a calibration. The span value
should exactly match the concentration of the gas you are using.
To set span value:
1. Enter the Set Span Value menu
The current span value is shown. The left most digit blinks.
2. Check and modify the Span Value as needed and accept changes.
The instrument returns to the Calibration menu.
If 3-Point Cal. Is selected, repeat this process for Span 2 Value.
NEO Photoionization Detector
OK
to scroll through the list. Hold
OK
OK
results for that gas.
that gas exclusively.
on ionisation of all detectable gases in the ambient air.
The example shown in this illustration is a flow chart of the NEO ppb.
OK
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or
OK
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Warning
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D e t e c t i o n D e t e c t i o n
for high speed scrolling.
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