Model GLI-93711 Portable Chlorine Meter
4
Rev. 0-401
OPERATIONAL GUIDE
MEASUREMENT PROCEDURE
1.
Turn the meter on by press-
ing ON/OFF.
2.
When the LCD displays
"- - -", it is ready.
3.
Select free or total Chlorine by pressing
FREE/TOTAL. In the lower right corner,
an "I" will appear to indicate free chlorine
or a "C" will appear to indicate total.
4.
Fill the cuvet with 10 ml of
unreacted sample, up to
the mark, and replace the
cap.
5.
Place the cuvet into
the holder and ensure
that the notch on the
cap is positioned se-
curely into the groove.
6.
Press ZERO and "SIP" will appear on the
display.
7.
Wait for a few seconds and the display
will show "-0.0-". Now the
meter is zeroed and
ready for measurement.
8.
Remove the cuvet.
9.
To measure
Free Chlorine
, add 3 drops
of DPD1 indicator (“Bottle A”) and 3
drops of DPD1 buffer (“Bottle B”) to the
other cuvet. To measure
Total Chlorine
,
also add 1 drop of DPD3 solution (“Bottle
C”). Shake gently before adding 10 ml of
unreacted sample from the first cuvet.
Replace the cap and shake gently again.
10. Reinsert the cuvet into the instrument.
11. Wait for approximately 30 seconds and
then press READ. The display will show
"SIP" during measurement.
The instrument directly displays concentra-
tion in mg/l of free or total chlorine.
NOTE:
Free and total chlorine have to be
measured separately with fresh un-
reacted samples following the
previously described procedure if
both values are needed.
INTERFERENCES
Interference may be caused by:
•
Bromine
•
Iodine
•
Fluorine
•
Ozone
•
Oxidized manganese
•
Chromium
Alkalinity above 250 mg/l or acidity above
150 mg/l will not reliably develop the full
amount of color or it may rapidly fade. To re-
