4 Units Description
4-
2． The signal gain of the photoelectric unit has been configured properly before the
analyzer is
sold to the custumer. When an alarm occurs indicating weak light,
replace the lamp directly instead of adjusting the signal gain. Usually it is
unnecessary to adjust signal gain after replacing the lamp. However, after doing
that, you should check whether the air blank AD exceeds the range on the
Maintenance-Daily Maint. page of the operating software. If not, click new lamp to
complete replacing new lamp. If yes, you need to adjust the signal gain.
3． Adjust the signal gain: It is recommended to use both automatic adjustment and
manual adjustment. Adjust signal gain automatically, and then adjust manually.
4.6.4.4 Checking Performance of Photometer
It is recommended to check the performance of photometer under the following
conditions:
1． The analyzer installation is completed.
2． The lamp is replaced or re-installed.
3． The filters are replaced or re-installed.
4． The measurement data is abnormal.
The checking method is as follows.
Request the tests that use water as sample and reagent in operating software.
For replacing or re-installing the lamp, request 20 times replicated tests in which the test
wavelength parameter is set as 340 and 405nm.
For other cases, it is necessary to check performance of each walvlength. So request 5
times replicated tests under each diffirent wavelength respectively (40 tests total).
The test time is set as 0~35 and other parameters are not limited.
Check reaction curve and data of each test after completing all the tests. The difference
between the minimum absorbance value and the maximum value for each detecting
point should be less than 30.
If the results can’t be compliant with the requirement, please check the following details.
If the test data from all wavelengths are abnormal, make sure that the installaion of
lamp is ok, including whether the pottery socket is stable and whether the lamp is
installed in the proper position.
If the test data from a part of wavelengths are abnormal, check whether the filter is
installed in the right way or whether the filter surface is dirty or has nicks
Check whether the lamp intensity is stable.
If the test data from a few cuvettes can’t be compliant with the requirement, it can
be concluded that there is no problem with the photometer and then check whether
there are air bubbles in the cuvette or whether the surface of the cuvette is dirty. If
yes, the photomethic performance is ok and the abnormal data can be ignored.
Check the performance again after resolving all of the above problems. If there are still
abnormal data, please contact the development engineer.
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