10
TAKING PHOTOMETER READINGS
The photometer is very simple to use. Intuitive screen prompts guide the user
towards the test result.
Program Numbers and Test Instructions
Each test is identified by a separate program number or named key. Program
numbers are shown in test instruction sheets supplied with the instrument or
reagent systems. For some tests, a choice of different programs is offered in
order to give the option of the result in different forms (eg for Nitrate - NO
3
or
Nitrate Nitrogen - NO
3
-N).
In certain methods, the test can be continued to a further stage - for example
in the tests free chlorine and total chlorine. This is accomplished in the
programming of the photometer. In these tests, once the first stage result is
obtained, the ‘Follow-On’ option may be selected to progress the test to the
next program stage or stages and the result will be calculated automatically.
These continuation programs have their own program number for reference
purposes although direct access to these programs may be restricted.
Sample Dilution
The 9500 has a sample dilution option. This enables a factor to be entered
when samples have been diluted to bring them within the measuring range of
the test. For example if a five times dilution of the sample has been made,
then the dilution factor x5 should be entered. The photometer will multiply the
observed result by this factor so that the correct result for the original sample
is displayed.
This option may be used in conjunction with the Dilution Tube which enables
dilutions of x2, x3, x4, x5 and x10 to be made; or with Dilution Syringes which
enable dilutions of up to x100 and xl000. Higher dilution factors may be entered
subject to the limitation of the number of digits available on the result display for
each test. When the display capabilities are exceeded, the symbol [xxx] will
appear on the result display. The sample should not be diluted prior to carrying
out a pH test, or Transmittance or Absorbance reading.
Blank and Sample Tubes
A BLANK TUBE is needed each time the photometer is used. This enables the
instrument to be set automatically and compensates for any inherent color in
the test sample.
The BLANK TUBE is a test tube filled only
with the sample being tested. It is
important to use the actual sample to be tested to provide a true comparison
for the test results.
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(40 pages)
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