Service and maintenance
9.1 Instrument verification
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
151
9.1.1.2
Span verification
For the span verification of the instrument follow steps 1 through 7 below. This process
should be documented using the form "Verification Sheet" in Appendix A (Page 198).
Step 1: Setup of verification tube
1.
Start the procedure by removing the receiver and transmitter from the flanges. Depending
on the prevailing safety conditions and what is more convenient, the power may be kept
on and the sensor connection cable stay connected, or the power may be shut off and the
sensor connection cable be disconnected.
CAUTION
Never disconnect the sensor connection cable with the power switched on.
2.
Mount the receiver and transmitter on the verification tube.
3.
If the analyzer has been moved to a location with a different ambient temperature than
that at the installation site, you need to wait until it has been adapted to the new
temperature before proceeding from this step. In this way you avoid condensation
problems and assure static and homogeneous temperature distribution in the verification
tube.
4.
If necessary, connect the sensor connection cable between the receiver and transmitter
and power up the SITRANS SL.
Step 2: Preparations and LUI settings
In order to document the verification procedure you should fill put 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.