6. Depress the ignition switch and hold down. Watch the
FLM
indicator in the display
window. When this indicator is illuminated the flame is a light and the ignition switch can
be released. If the
FLM
indicator does not light within approximately 20 seconds,
release the switch and open the
fuel
valve one additional turn. Allow the gas to disperse
before continuing. Depress the ignition switch for a further 20 seconds. This process may
be repeated until successful ignition occurs. If the
fuel
valve has to be opened more than 5
turns more than recommended above, refer to Section 7.5.
7. Set the
filter select
control to the desired position.
8. Aspirate deionised water and set the readout to zero by adjusting the
blank
control.
9. Aspirate a standard solution of slightly higher concentration than expected in the
samples to be tested. Adjust the
fine and coarse
control until a positive reading is
obtained. This is a nominal value to be used in optimising flame conditions.
10. Adjust the
fuel
valve in a clockwise direction until a peak reading is obtained.
NOTE: There is a time delay between adjusting the flow of fuel and seeing the
effect of the adjustment. A pause of a few seconds is therefore necessary
between making every fine adjustment.
The optimum flame conditions are different for Na and K and
retuning is necessary when switching between elements.
11. For optimum performance the instrument should be allowed 15 minutes to warm-up.
During this warm-up period a blank deionised water sample should be aspirated. It
should be noted that results, adequate for most purposes, can be obtained from switch
on, although standardisation settings will need frequent checking during the warm-up
period.
500 795/Rev E/03-17
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