Zero Calibration; Span Calibration - WatchGas NEO User Manual

User Manual

7.1.2 ZERO CALIBRATION

The zero calibration sets the baseline for the sensor. To perform a zero calibration:
1. Connect the instrument to a source of clean air.
2. Enter Config Menu > Calibration Menu > Zero Calib Menu.
3. Confirm with
OK
Ent Esc
The instrument counts down to zero. When complete, the display shows "Zero Calibration Done!". The
instrument proceeds to Span Calibration.
Note:
You can abort the calibration at any time by pressing
and proceeds to Span Calibration.

7.1.3 SPAN CALIBRATION

Note: To ensure greater accuracy please preform a 3-point calibration.
The span calibration sets the second (and third, if 3-Point Cal is selected in Monitor Setup) calibration
point for the sensor. To perform a span calibration:
1. Check that 2-Point or 3-Point Calibration is set correctly (See 7.5.5 3-Point Calibration).
2. Check that the calibration gas is set correctly (See 7.1.4 Set Calibration Gas).
3. Check that the span values are set correctly (See 7.1.5 Set Span Value).
4. Connect the instrument to a source of calibration gas.
5. Enter Config Menu > Calibration Menu > Span Calib Menu item.
6. Confirm with
OK
Ent Esc
The instrument counts down to zero. When complete, the display shows "Span 1 is Done! Reading = xx
ppm". The reading should be very close to the actual concentration.
If 3-Point Calibration is enabled, proceed to perform Span 2 in the same manner.
Note:
You can abort the calibration at any time by pressing
and returns to the menu.
NEO Photoionization Detector
.
Ent
.
Ent
during countdown. The display shows "Zero aborted!"
OK
Esc
OK
during countdown. The display shows "Span aborted!"
Esc
15
D e t e c t i o n D e t e c t i o n
Span 1 is done!
Reading = 10.ppm
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