(3) Adjust the light control for a 90% T meter reading.
(4) Slowly rotate the wavelength dial between 560 and 590 nm.
Determine and note the wavelength setting that gives the maximum
deflection from 100% T on the meter scale.
(5) The wavelength dial setting on your spectrophotometer is
accurately adjusted if the wavelength setting determined in step (4)
is 575 nm.
Irregular Water Test Results
Test Results Are Suspect
Exceeded Shelf Life
Operating Checks on Meters (Summary)
This section contains troubleshooting information for locating
and correcting most of the operating troubles which may develop in the
water quality analysis set.
Each malfunction for individual component,
or unit is followed by a list of test or inspections which will help
you determine corrective action to take.
You should perform the test/
inspections and corrective action in the order listed.
This manual cannot list all malfunctions that may occur, nor
all tests or inspections and corrective action.
If a malfunction is
not listed or is not corrected by the list corrective actions, notify
c. The table 3-2 lists the common malfunctions which you may find
during the operating of maintenance of the set or its components.
should perform the tests/inspections and corrective action in the
Appendix B (MAC) assigns repair and calibration respon-
sibilities of some items to the organization/support level.
the operator is usually in an isolated or forward position, not
readily available to the organization/support level the troubleshoot-
ing procedures have been expanded.
If the need arised and the effort
must be made to keep the WQAS functional, you, the operator, shall
effect such corrective action as within your skill and means.
IRREGULAR WATER TEST RESULTS.
Test results are suspect.
Lack of cleanliness and other con-
tamination (interference) of lab-ware should be considered.
the test and compare results.
When the comparison is
similar but still suspect, the reason may lie in a faulty procedure,