Endress+Hauser OXY5500 - Page 43

OXY5500 Gas Analyzer Operating Instructions
Endress+Hauser 43
6. Close the cylinder valve and crack the dual stage pressure regulator outlet valve. Allow the gas to discharge until
both the primary and secondary regulator pressure gases approach zero.
7. Close the dual stage pressure regulator outlet valve prior to releasing the last amount of gas pressure.
8. Repeat steps 1 to 7 fifteen (15) times for each regulator.
 For best results, discharge the regulator as much as possible without releasing all of the pressure on each purge
cycle.
9. Open the cylinder valve and ensure the regulator is set to 200 KPaG (30 PSIG).
10. Open the dual stage pressure regulator outlet valve fully. Ensure there are no restrictions on the sample return
that may cause back pressure during the purge cycle.
5.13.1 Performing a manual calibration (calibration using sensor values)
If the sensor was not previously calibrated with the analyzer (e.g., sensor replacement), the calibration can be set by
simply entering the values from the Calibration Certificate provided with the analyzer, without the need for
calibration gases. Refer to the sample Calibration Certificate → . However, calibrating with gases is more accurate
because it accounts for variability in the specific installation. To calibrate with gas, refer to Performing a two-point
calibration → .
1. Change the values for Cal0, T0, Cal2nd, T2nd, and pATM according to the values shown in the Calibration
Certificate. Refer to Figure 52.
Figure 52. Calibration data screen - Changing the pressure unit
 On the Calibration Certificate, “pATM” is shown as “Atmospheric Pressure” under Calibration Specifications
during Cal0 and Cal2nd.
2. Change the O2-2nd value according to the value shown below the cal2nd column.
 Confirm that the correct unit for the O2-2nd and pATM values are selected.
3. Click Save in the upper right of the screen to store the changes and complete the manual calibration of the
analyzer.
The display will automatically change to the MEASUREMENT window. If another sensor type has been selected,
a message window will display stating that the sensor type change has reset RATA. Refer to Relative accuracy
test audit (RATA) → .