Siemens SITRANS SL Operating Instructions Manual page 9

Step 2: Preparations and LUI settings
In order to document the verification procedure you should fill out the 'Verification sheet' form thoroughly during
verification.
1. Make a copy of the "SITRANS SL O2 Verification sheet" form you can find in Appendix A.
2. Fill out the first part (General Information).
3. Enter the password to access the Local User Interface (LUI).
Note
Remember to write down the original values before making alterations to the settings!
4. Note the current integration time in the verification sheet. Set the integration time to 20 s.
5. Note the settings for the path length in the verification sheet. Set the path length to 0.450 m which is the effective
length in the verification tube. Notice that this is valid with the in-line reference cell in place.
6. Note pressure source settings and, if applicable, pressure manual value in the verification sheet. Set the pressure
source to "manual" and enter the pressure value given in the verification kit certificate of the instrument. Note this
value also in the verification sheet.
7. Note temperature source settings and, if applicable, temperature manual value in the verification sheet. Set the
temperature source to "manual" and enter the temperature value given in the verification kit certificate of the
instrument. Note this value also in the verification sheet.
Step 3: Purging with Nitrogen
Note
In the instruction it is assumed that totally oxygen free nitrogen is used. The concentration value of the SITRANS SL
during this procedure will not be lower than the oxygen content in the nitrogen.
1. R02 option: Attach your source of purging gas (N
R03 option: Attach your source of purging gas (N
2. Close the other needle valve.
3. Purge until the concentration value stabilizes (concentration changes less than 0.3 vol %/minute) and then turn off the
gas.
4. Close the needle valve. Wait for 10 minutes. After this time the O
0.15 Vol%. If the O value exceeds this limit refer to section (Problem handling: insufficient purging) at the end of this
2
chapter for further proceedings.
5. Remove the needle valve completely on either the receiver or the transmitter side. This is necessary to avoid any
overpressure in the tube.
Step 4: Filling the verification tube with pressurized air
1. Disconnect the nitrogen source.
2. R02 option: attach your source of dry, oil free, pressurized air to the needle valve on either of the receiver or
transmitter side.
R03 option: attach your source of dry, oil free, pressurized air directly to the transmitter.
3. Purge with a volume flow of approx. 4 liters/minute. Verification must be performed within 10 minutes from this step to
prevent air from entering into the volume behind the lenses.
4. Purge until the concentration value stabilizes (concentration changes less than 0.3 vol %/minute) and then turn off the
gas.
5. Remove the needle valve completely on either the receiver or the transmitter side. Wait until the concentration value
stabilizes (concentration changes less than 0.3 vol %/minute).
This is necessary to avoid any overpressure in the tube.
Amendment 3 to Operating Instructions SITRANS SL Version 04
A5E50017120A-02, 01/2021
) to the needle valve on either the receiver or the transmitter side.
2
) directly to the transmitter.
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value should not have increased to more than
2
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