5. Block the pump bypass flow.
Figure 106 – Pump Bypass Flow
6. Wait 2 - 5 minutes and ensure the pressure reading on the barometer has dropped and is stable.
7. Enter the barometer reading into the instrument - Accept.
8. Read displayed instructions - OK.
9. The pump should now stop automatically. Disconnect the barometer from the Sample Port.
10. Wait 2 - 5 minutes and enter the ambient barometer reading into the instrument - Accept.
Note: Both of the pressure sensors should now be displaying the current ambient pressure and
they should be the same value within 3 torr of each other.
11. Back - Pressure Calibration Menu - (read note) - OK.
5.4 Zero Calibration
Zero calibrations are used to determine the zero response of the instrument and apply an offset to the
reading.
Performing a zero calibration will adjust the Zero Offset O3. This offset can be checked in the Main
Menu → Service Menu → Calculation Factors Menu and should be very close to zero. A large offset
may indicate a problem with the instrument (refer to Section 7).
Note: Ecotech encourages regular zero precision checks; however Ecotech recommends that the
zero calibration only be performed when specifically required as it may mask issues that should be
addressed during maintenance/service.
A zero calibration can be performed either through the Calibration Port, Sample Port or internal
through the optional IZS (Internal Zero/Span). Refer to the instructions outlined in the next three
sections:
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