43. Slowly remove the barometer from the Calibration Port, allowing the instrument to return to
ambient pressure.
44. Turn the manual stop valve 90° (Open).
45. Open - Main Menu → Service Menu → Diagnostics Menu → Valve Menu.
46. Enable - Valve Sequencing → Enabled.
47. Open - Main Menu → Service Menu → Diagnostics Menu → Internal Pump Menu.
48. Select - Pump Control → Start - Accept.
6.4.5 CO-CO
2
Converter Check
The internal CO-CO
2
converter provides a source of continuous CO free air for auto-zero and
background functions. Failure of the converter can result in drift, poor sensitivity near zero and
continuous electronic zero adjusts.
Note: Ensure that the instrument has been running for at least one hour before this procedure is
performed.
Equipment Required
• Span gas source 40ppm CO
• 5/8” Spanner
Procedure
1. Open - Main Menu → Calibration Menu.
2. Select - Cal. Type → Manual - Accept.
3. Select - Zero Source → Internal - Accept.
4. Select - Cal. Mode → Zero - Accept.
5. Allow the instrument to sample Zero air from the CO-CO
2
for approximately 5 minutes.
6. Record the instrument response as the “Initial” value.
Note: This value should be 0.00 ± 0.1 ppm. If it is not, a background should be initiated by initiating
the background field within the calibration menu. The background will take approximately 5
minutes to complete.
7. Connect 40 ppm CO span source to the Background Air Port ensuring the inlet pressure is
maintained at ambient (vented).
8. Allow the instrument to sample the span source for 5 minutes.
9. Record the instrument response as the “Challenge” value.
10. Disconnect the span source.
11. Open - Main Menu → Calibration Menu.
12. Select - Cal. Type → Manual - Accept.
13. Select - Zero Source → External - Accept.
14. Select - Cal. Mode → Measure - Accept.
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