GLI International GLI-93711 User manual

Manual No. 93711
Revision 0-401
MODEL GLI-93711
HAND-HELD/PORTABLE
TOTAL/FREE CHLORINE METER

Model GLI-93711 Portable Chlorine Meter 2 Rev. 0-401
Please read this instruction manual carefully
before using the instrument. This manual will
provide you with all the necessary information
for the correct use of the instrument.
This meter is in compliance with European
Community (CE) directives EN 50081-1 and
EN 50082-1.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION ................................. 2
GENERAL DESCRIPTION ........................................ 2
SPECIFICATIONS.................................................. 2-3
OPTIONAL REAGENT ACCESSORIES .................... 3
DISPLAY CODE........................................................ 3
OPERATIONAL GUIDE..........................................4-5
TIPS FOR AN ACCURATE MEASUREMENT............ 5
BATTERY REPLACEMENT ...................................... 5
WARRANTY.............................................................. 5
PRELIMINARY EXAMINATION
Remove the instrument from the packing
material and examine it carefully to make
sure that no damage has occurred during
shipping. If there is any damage, notify the
transit carrier immediately.
Each meter is supplied complete with:
•Two sample cuvets and caps
•One transport cap
•Instruction Manual
•One 9 Volt Battery
NOTE: Save all packing material until you
are sure that the instrument func-
tions correctly. All defective items
must be returned in their original
packaging together with the supplied
accessories.
GENERAL DESCRIPTION
The meter measures the free and total chlo-
rine (Cl2) content in water and wastewater.
The meter uses an exclusive positive-locking
system to ensure that the cuvet is in the
same place every time it is placed into the
measurement cell.
The reagents are in liquid form and are sup-
plied in bottles. The amount of reagent is
precisely dosed to ensure maximum repeat-
ability.
Display codes aid the user in routine opera-
tions.
The meter has an auto-shut off feature that
will turn the instrument off after 10 minutes of
non-use.
SPECIFICATIONS
METER

Rev. 0-401 3 Model GLI-93711 Portable Chlorine Meter
Ran
g
e Free Cl2
Total Cl2
0.00 to 2.50 mg/l
0.00 to 3.50 mg/l
Resolution Free Cl2
Total Cl2
0.01 mg/l
0.01 mg/l
Accuracy @20°C/68°F ± 0.03 mg/l; ± 3% of reading
Typical EMC Devia-
tion
± 0.01 mg/l
Light Source LED @ 555 nanometers
Light Detector Silicone photocell
Measurement
Method
Adaption of EPA recom-
mended DPD method
330.5. The reaction be-
tween the chlorine and the
DPD reagent causes a pink
tint to appear in the sample.
Operating Conditions From 0 to 50°C (32 to
122°F); max. 95% relative
humidity
Power Requirement One 9 volt battery; 40
hours continuous use;
auto shut-off after 10
minutes of non-use
Dimensions 7.1 x 3.3 x 1.8 inches
(180 x 83 x 46 mm)
Weight 10 oz. (290 g)
OPTIONAL REAGENT ACCESSORIES
The optional liquid reagent kit GLI-93701-T
(for up to 300 tests of total/free chlorine) con-
sists of:
Part Number Unit Description Quantity
GLI-93701A-T Total/free Cl2DPD1 indicator 3 drops
GLI-93701B-T Total/free Cl2DPD1 buffer 3 drops
GLI-93701C Total Cl2only DPD3 solution 1 drop
DISPLAY CODE GUIDE
This indicates that the meter
is in a ready state and ze-
roing can be performed.
Sampling in Progress. This
prompt appears each time
the meter is performing a
measurement.
This indicates that the meter
is in a zeroed state and
measurement can be per-
formed.
A zero reading was not
taken. Insert a sample be-
fore adding reagent and
press ZERO.
Under range. A blinking
"0.00" indicates that the
sample absorbs less light
than the zero reference.
Check the procedure and
make sure you use the
same cuvet for reference
(zero) and measurement.
Over range. A flashing value
higher than the maximum
readable concentration (see
SPECIFICATIONS) indicates
that the sample absorbs too
much light, meaning that the
concentration is too high.
Dilute the sample.
Light over range. The cuvet
is not inserted correctly and
an excess ambient light is
reaching the detector. If the
cover is properly installed,
then contact the GLI Cus-
tomer Service Dept.
Light under range. The zero
sample is too dark for proper
zeroing. If this is not the
case, contact the GLI Cus-
tomer Service Dept.
The "V" indicates that the
battery voltage is getting low
and the battery needs to be
replaced.
This indicates that the bat-
tery is dead and must be
replaced.
NOTE: Once this indication
is displayed, the
meter will lockup.
Change the battery
to restart.

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-

Rev. 0-401 5 Model GLI-93711 Portable Chlorine Meter
solve this, neutralize the sample with diluted
HCl or NaOH.
In case of water with hardness greater than
500 mg/l CaCO3, shake the sample for about
1 minute after adding the reagent.
TIPS FOR AN ACCURATE
MEASUREMENT
The tips listed below should be carefully fol-
lowed during testing to ensure best accuracy:
•Do not touch the cuvet walls with hands.
•To maintain the same conditions during
the zeroing and measuring phases, it is
necessary to close the cuvet to prevent
any contamination.
•Do not let test sample stand too long after
reagent is added or accuracy will be lost.
•Whenever the cuvet is placed into the
measurement cell, it must be completely
free of fingerprints, oil or dirt. Wipe it thor-
oughly with a lint-free cloth prior to
insertion.
•It is important that the sample does not
contain any debris. This would corrupt the
readings.
•It is possible to take multiple readings in a
row, but it is recommended that a zero
reading be taken for each sample and that
the same cuvet is used for zeroing and
measurement.
•It is important to discard the sample im-
mediately after the reading is taken
because the glass might become perma-
nently stained.
•Shaking the cuvet can generate bubbles
in the sample, causing higher readings.
To obtain accurate measurements, re-
move such bubbles by swirling or by
gently tapping the vial.
All the reaction times reported in this manual
are referred to 20°C (68°F). As a general
rule, they should be doubled at 10°C (50°F)
and halved at 30°C (86°F).
BATTERY REPLACEMENT
When the battery is low,
"BA" is displayed to indicate
that it must be replaced.
Battery replacement must only take place in a
non-hazardous area. To replace a run-down
battery, simply remove the battery compart-
ment cover on the rear of the meter and
replace the battery, observing correct polarity.
WARRANTY
GLI International, Inc. warrants the Model
GLI-93711 Hand-held/Portable Chlorine Me-
ter to be free from defects in material or
workmanship for a period of one year (12
months) from the date of shipment of this
product from our facility. A warranty claim will
not be honored if defects are not reported
within the warranty period, or if GLI Interna-
tional determines that defects or damages
are due to normal wear, misapplication, lack
of maintenance, abuse, improper installation,
alteration or abnormal conditions. GLI Inter-
national’s obligation under this warranty shall
be limited to, at its option, replacement or re-
pair of this product. The product must be
returned to GLI International, freight prepaid,
for examination. The product must be thor-
oughly cleaned and any process chemicals
removed before it will be accepted for re-
placement or repair. GLI International’s
liability shall not exceed the cost of the prod-
uct. Under no circumstances will GLI
International be liable for any incidental or
consequential damages, whether to person
or property. GLI International will not be liable
for any other loss, damage or expense of any
kind, including loss of profits, resulting from
the installation, use, or inability to use this
product.