Hanna Instruments HI 95771C User Manual

Instruction Manual

HI 95771C

Chlorine

Ultra High Range

ISM

www.hannainst.com

MAN95771CR3 06/06

www.hannainst.com

This Instrument is in

Compliance with the CE Directives

Dear Customer,
Thank you for choosing a Hanna product. This manual will provide you with the necessary

information for the correct use of the instrument. Please read it carefully before using the meter.
If you need additional technical information, do not hesitate to e-mail us at [e-mail].

This instrument is in compliance with

directives.

TABLE OF CONTENTS

PRELIMINARY EXAMINATION ................................................................................................ 3

GENERAL DESCRIPTION......................................................................................................... 4

ABBREVIATIONS...................................................................................................................4

SPECIFICATIONS ..................................................................................................................5

PRECISION AND ACCURACY................................................................................................... 6

PRINCIPLE OF OPERATION .................................................................................................... 6

FUNCTIONAL DESCRIPTION ................................................................................................... 8

GUIDE TO DISPLAY CODES .................................................................................................... 9

GENERAL TIPS FOR AN ACCURATE MEASUREMENT .................................................................12

OPERATIONAL GUIDE ...........................................................................................................13

MEASUREMENT PROCEDURE FOR 771 ..................................................................................14

MEASUREMENT PROCEDURE FOR 701 ..................................................................................16

VALIDATION PROCEDURE .....................................................................................................17

CALIBRATION PROCEDURE ...................................................................................................19

BATTERY REPLACEMENT ....................................................................................................... 21

ACCESSORIES .....................................................................................................................21

CE DECLARATION OF CONFORMITY........................................................................................22

WARRANTY .........................................................................................................................22

USER NOTES.......................................................................................................................23

USER NOTES

Date Validation Value

Date Validation Value

Parameter Code

771

Parameter Code

701

(mg/L)

(mg/L)

Passed

yes not

Passed

yes not

Calibration

yes not

Calibration

yes not

All rights are reserved. Reproduction in whole or in part is prohibited without the written consent
of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895 , USA.

2

23

CE DECLARATION OF CONFORMITY

PRELIMINARY EXAMINATION

Recommendations for Users

Before using these products, make sure that they
are entirely suitable for your specific application
and for the environment in which they are used.

Operation of these instruments may cause
unacceptable interferences to other electronic
equipments, this requiring the operator to take all
necessary steps to correct interferences.

Any variation introduced by the user to the supplied
equipment may degrade the instruments' EMC
performance.

To avoid damages or burns, do not put the
instrument in microwave oven. For yours and the
instrument safety do not use or store the instrument
in hazardous environments.

WARRANTY

HI 95771 is warranted for two years against defects in workmanship and materials when used
for its intended purpose and maintained according to the instructions.

This warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed maintenance are not covered.
If service is required, contact your dealer. If under warranty, report the model number, date of

purchase, serial number and the nature of the failure. If the repair is not covered by the warranty,
you will be notified of the charges incurred.

If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods
Authorization Number from the Customer Service Department and then send it with shipment
costs prepaid. When shipping any instrument, make sure it is properly packaged for complete
protection.

To validate your warranty, fill out and return the enclosed warranty card within 14 days from the
date of purchase.

Please examine this product carefully. Make sure that the instrument is not damaged. If any damage
occured during shipment, please notify your Dealer.

Each HI 95771 Ion Selective Meter is supplied complete with:

• Two Sample Cuvets and Caps

• 9V Battery

• Scissors

• Two CAL CHECK™ Cuvets (HI 95771-11) with Quality Certificate

• Tissue for wiping cuvets

• Instruction Manual and Quick Reference Guide

• Instrument Quality Certificate

• Rigid carrying case

Note:save all packing material until you are sure that the instrument works correctly. Any defective

item must be returned in its original packing.

HANNA instruments® reserves the right to modify the design, construction and appearance of its

products without advance notice.

22

3

GENERAL DESCRIPTION

9V

SLIDE

OFF

The HI 95771 is an auto diagnostic portable microprocessor meter that benefits from Hanna’s
years of experience as a manufacturer of analytical instruments. It has the advanced optical
system based on a special tungsten lamp and a narrow band interference filter that allows most
accurate and repeatable readings. All instruments are factory calibrated and the electronic and
optical design minimizes the need of frequent calibration.

With the powerful CAL CHECK™ validation function you are able to validate good performance of
your instrument at any time. The validation procedure is extremely user friendly. Just use the
exclusive Hanna ready-made, Nist traceable standards to verify the performance of the instrument
and recalibrate if necessary.

All instruments are splash proof and the lamp and filter units are protected from dust or dirt by
a transparent cup. This makes the instruments fulfill field applications. Display codes aid the
user in routine operation. The meter has an auto-shut off feature that will turn off the instrument

after 10 minutes of non use or after 1 hour if left in the calibration mode.

The meter uses an exclusive positive-locking system to ensure that the cuvet is in the same
position every time it is placed into the measurement cell. It is designed to fit a cuvet with a
larger neck making it easier to add both sample and reagents. The cuvet is made from special
optical glass to obtain best results.

The HI 95771 is a dual range meter that can measure the chlorine (Cl

) content in water

2

samples in the 0 to 5.00 mg/L (ppm) range and in the 0 to 500 mg/L (ppm) range. The

methods are an adaptation of Standard Methods for the Examination of Water and

th

Wastewater, 20

The reagents are in

edition, 4500-Cl.

powder form and are supplied in packets. The amount of reagent is precisely

dosed to ensure the maximum repeatability.

ABBREVIATIONS

°C:

degree Celsius

°F:

degree Fahrenheit

LCD:

Liquid Crystal Display

mg/L:

milligrams per liter. mg/L is equivalent to ppm (part per million)

mL:

milliliter

4

FACTORY CALIBRATION RESET

It is possible to restore factory calibration:

• Enter the calibration mode by holding CAL CHECK

for three seconds.

• Hold ZERO/SET for 10 seconds. The display
will show for 2 seconds “F.CAL” and "771" or
“701” appears. The factory calibration is
automatically restored and the instrument is
ready for measurement by displaying "771" or
“701” on the LCD depending to which
parameter code has been selected.

BATTERY REPLACEMENT

Battery replacement must only take place in a
non-hazardous area.

Simply slide off the battery cover on the back of
the meter. Detach the battery from the terminals
and attach a fresh 9V battery while paying attention
to the correct polarity. Insert the battery and
replace the cover.

ACCESSORIES

REAGENT SETS
HI 95771-01 Reagents for 100 Chlorine Ultra High Range tests
HI 95771-03 Reagents for 300 Chlorine Ultra High Range tests
HI 93701-01 Reagents for 100 Free Chlorine tests
HI 93701-03 Reagents for 300 Free Chlorine tests
OTHER ACCESSORIES
HI 95771-11 CAL CHECK™ Standard Cuvets
HI 710009 Blue rubber boot
HI 710010 Orange rubber boot
HI 721310 9V battery (10 pcs)
HI 731318 Tissue for wiping cuvets (4 pcs)
HI 731331 Glass cuvets (4 pcs)
HI 731335 Caps for cuvets (4 pcs)
HI 93703-50 Cuvets cleaning solution (230 mL)

(1 set)

21

or

• Press READ/TIMER and “SIP” will blink during
measurement.

SPECIFICATIONS

• The instrument will show for three seconds the
CAL CHECK™ standard value, i.e. 100 for “771”
chlorine ULTRA HIGH RANGE or 1.00 for “701”
chlorine LOW RANGE.

Then the date of last calibration (e.g.:
“01.08”) appears on the display, or “01.01”
if the factory calibration was selected. In both
cases the number of the month is blinking,
ready for date input.

Note: if the display shows “ERR” the
calibration procedure failed. Verify that both
CAL CHECK™ Standards HI 95771-11 Cuvets, A
and B, are free from fingerprints or dirt and that
they are inserted correctly.

DATE INPUT

• Keep READ/TIMER pressed to scroll to the desired
month number (01-12).

• When the correct month has been set, press
ZERO/SET to confirm. Now the display will
show the day number blinking. Keep READ/
TIMER pressed to scroll to the desired day
number (01-31).

Note: it is possible to change from day to
month and vice versa by pressing ZERO/SET.

• When both the day and month have been
selected, hold CAL CHECK
store date and calibration values. The instrument
will show for one second “Stor”, to confirm
that the new calibration data has been
accepted.

• The instrument will return automatically to
the measurement mode by displaying "771"
or “701” on the LCD depending to which
parameter code has been selected.

for three seconds to

or

or

or

for 771 Chlorine ULTRA HIGH RANGE

Range 0 to 500 mg/L
Resolution 1 mg/L from 0 to 200 mg/L; 10 mg/L above 200 mg/L
Precision ±2 mg/L @ 100 mg/L
Typical EMC Deviation ±1 mg/L

for 701 Chlorine LOW RANGE

Range 0.00 to 5.00 mg/L
Resolution 0.01 mg/L from 0.00 to 3.50 mg/L; 0.10 mg/L above 3.50 mg/L
Precision ±0.02 mg/L @ 1.00 mg/L
Typical EMC Deviation ±0.01 mg/L

Light Source Tungsten lamp with narrow band interference filter @ 525 nm
Light Detector Silicon Photocell

Method Adaptation of Standard Methods for the Examination of Water and

Wastewater, 20

and the reagents causes a pink (701) or yellow (771) tint in the
sample.

Environment 0 to 50°C (32 to 122°F); max 95% RH non-condensing
Battery Type 1 x 9 volt
Auto-Shut off

Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8")
Weight 290 g (10 oz.).

REQUIRED REAGENTS
Code Description Quantity/test

HI 95771A-0 Chlorine Ultra HR Reagent A 1 packet
HI 95771B-0 Chlorine Ultra HR Reagent B 1 packet
HI 93701-0 Free Chlorine Reagent 1 packet

After 10' of non-use in measurement mode;
after 1 hour of non-use in calibration mode.

th

edition, 4500-Cl. The reaction between chlorine

20

5

PRECISION AND ACCURACY

Precision is how closely repeated
measurements agree with each other. Precision
is usually expressed as standard deviation (SD).

Accuracy is defined as the nearness of a test
result to the true value.

Although good precision suggests good
accuracy, precise results can be inaccurate.
The figure explains these definitions.

In a laboratory using a standard solution of
100 mg/L chlorine and a representative lot of
reagent, an operator obtained with a single
instrument a standard deviation of 2 mg/L.

PRINCIPLE OF OPERATION

Absorption of Light is a typical phenomenon of interaction between electromagnetic radiation and
matter. When a light beam crosses a substance, some of the radiation may be absorbed by
atoms, molecules or crystal lattices.

If pure absorption occurs, the fraction of light absorbed depends both on the optical path length
through the matter and on the
Lambert-Beer Law:

Where:

-log I/I

= Absorbance (A)

o

= intensity of incident light beam

I

o

I = intensity of light beam after absorption

ε

= molar extinction coefficient at wavelength λ

λ

c = molar concentration of the substance
d = optical path through the substance

Therefore, the concentration "c" can be calculated from the absorbance of the substance as the
other factors are known.

physical-chemical characteristics of the substance according to the

-log I/I

= ε

o

λ

c d

or

A = ε

c d

λ

CALIBRATION PROCEDURE

Note: It is possible to interrupt calibration procedure at any time by pressing ON/OFF.
Warning: do not validate or calibrate the instrument with standard solutions other than the Hanna

CAL CHECK™
Calibration results, please perform test at room temperature: 18 to 25°C (64.5 to 77.0°F).

CALIBRATION PROCEDURE

• Select the parameter code “771” for
chlorine ULTRA HIGH RANGE or “701”
for chlorine LOW RANGE by holding
ZERO/SET (see page 13).

• Enter the calibration mode by holding CAL

CHECK

• The date of the last calibration appears
(e.g.: month “01”, day “08”). “F.CAL”
means that the factory calibration is
selected.

Note: at this point it is possible to
reset the instrument to restore FACTORY
CALIBRATION, see instructions page 21.

• Place the CAL CHECK™ Standard Cuvet A
into the holder and ensure that the
notch on the cap is positioned securely
into the groove.

• Press ZERO/SET and “SIP” will blink on
the display.

• After a few seconds the display will
show “-0.0-”. The meter is now zeroed
and ready for calibration.

• Remove the cuvet.

• Place the CAL CHECK™ Standard HI
95771-11 Cuvet B into the holder and
ensure that the notch on the cap is
positioned securely into the groove.

Standards, otherwise erroneous results will be obtained. For accurate Validation and

for three seconds.

or

6

19

• Select the parameter code “771” for chlorine
ULTRA HIGH RANGE or “701” for chlorine
LOW RANGE by holding ZERO/SET (see page 13).

• Place the CAL CHECK™ Standard Cuvet A
into the holder and ensure that the
notch on the cap is positioned securely
into the groove.

• Press ZERO/SET and “SIP” will blink on
the display.

Photometric chemical analysis is based on the possibility to develop an absorbing compound from a
specific chemical reaction between sample and reagents. Given that the absorption of a compound
strictly depends on the wavelength of the incident light beam, a narrow spectral bandwidth should be
selected as well as a proper central wavelength to optimize measurements.

The optical system of Hanna's HI 95 series colorimeters is based on special subminiature tungsten
lamps and narrow-band interference filters to guarantee both high performance and reliable results.

Block diagram (optical layout)

• After a few seconds the display will
show “-0.0-”. The meter is now zeroed
and ready for validation.

• Remove the cuvet and place the
CAL CHECK™ Standard HI 95771-11
Cuvet B into the holder. Ensure that the
notch on the cap is positioned securely
into the groove.

• Press CAL CHECK and “SIP” will blink
during measurement.

• Wait for a few seconds and the display will show the validation standard value.
The reading should be within specifications as reported on the CAL CHECK™ Standard Certificate.
If the value is found out of specifications, please check that the cuvets are free of fingerprints, oil or
dirt and repeat validation. If results are still found out of specifications then recalibrate the
instrument.

A microprocessor controlled special tungsten lamp emits radiation which is first optically
conditioned and beamed to the sample contained in the cuvet. The optical path is fixed by the
diameter of the cuvet. Then the light is spectrally filtered to a narrow spectral bandwidth, to
obtain a light beam of intensity I

or I.

o

The photoelectric cell collects the radiation I that is not absorbed by the sample and converts
it into an electric current, producing a potential in the mV range.

The microprocessor uses this potential to convert the incoming value into the desired measuring
unit and to display it on the LCD.

The measurement process is carried out in two phases: first the meter is zeroed and then the
actual measurement is performed.

The cuvet has a very important role because it is an optical element and thus requires particular
attention. It is important that both the measurement and the calibration (zeroing) cuvets are
optically identical to provide the same measurement conditions. Whenever possible use the same
cuvet for both. It is necessary that the surface of the cuvet is clean and not scratched. This to
avoid measurement interference due to unwanted reflection and absorption of light. It is
recommended not to touch the cuvet walls with hands.

Furthermore, in order to maintain the same conditions during the zeroing and the measuring
phases, it is necessary to close the cuvet to prevent any contamination.

18

7

FUNCTIONAL DESCRIPTION

1) Liquid Crystal Display

2) Cuvet Holder

3) Cuvet alignment indicator

4) ON/OFF key

5) ZERO/SET key

6) READ/TIMER key

7) CAL CHECK key

KEYPAD DESCRIPTION

• ON/OFF: to turn the meter on and off.

• ZERO/SET: this is a bi-functional key: press to zero the meter prior to measurement, or hold
the key for 3 seconds to select the desired parameter (“701” chlorine LOW RANGE or “771”
chlorine ULTRA HIGH RANGE).

• READ/TIMER: this is a bi-functional key, just press for making a measurement, or hold the
key for 3 seconds to start a pre-programmed countdown prior to measurement.

• CAL CHECK: this bi-functional key allows to perform validation of the instrument just pressing

the CAL CHECK key, or hold the key for 3 seconds to enter the calibration mode.

• Hold READ/TIMER for three seconds. The
display will show the countdown prior to
measurement.
Alternatively, wait for 1 minute and just
press READ/TIMER.
In both cases “SIP” will blink during
measurement.

• The instrument directly displays concentration
in mg/L of free chlorine on the Liquid
Crystal Display.

INTERFERENCES

• Alkalinity:

above 1,000 mg/L CaCO
above 250 mg/L CaCO

if present as carbonate (CO

3

In both cases, it will not reliably develop the full amount of color or it may rapidly
fade (negative error). To resolve this, neutralize the sample with diluted HCl.

• Acidity:

above 150 mg/L CaCO3. May not reliably develop the full amount of color or it
may rapidly fade (negative error). To resolve this, neutralize the sample with
diluted NaOH.

• Hardness:

in case of water with hardness greater than 500 mg/L CaCO
for approximately 2 minutes after adding the powder reagent.

• Bromine (Br2):

• Iodine (I2):

positive error.

positive error.

or

if present as bicarbonate (HCO

3

• Chlorine dioxide (ClO

• Ozone

(O3):

2-

3

-

, sample pH < 8.3);

3

, sample pH > 9.0).

, shake the sample

3

):

2

positive error.

positive error.

OPERATING MODES

• Measurement mode: default operation mode, enables both validation and measurement.

• Calibration mode: may be entered by keeping CAL CHECK pressed

for three seconds (the “CAL”

icon appears), it enables calibration of the instrument.

8

• Oxidized Manganese

positive error.

and Chromium:

VALIDATION PROCEDURE

Use the validation procedure to ensure that the instrument is properly calibrated.
Warning: do not validate or calibrate the instrument with standard solutions other than the Hanna

CAL CHECK™ Standards, otherwise erroneous results will be obtained.
For accurate Validation and Calibration results, please perform test at room temperature: 18 to 25°C

(64.5 to 77.0°F).

Temperature correction for Validation: corrected value = read value × [1 + 0.002 × (20 − T(°C))]

corrected value = read value × [1 + 0.001 × (68 − T(°F))]

17

MEASUREMENT PROCEDURE

MEASUREMENT PROCEDURE FOR 701

WarningWarning

Warning: if the Chlorine Low Range reagent is added to a sample with high chlorine

WarningWarning

concentration, the color formed can be rapidly bleached, resulting erroneous low readings.

• Select the parameter code “701” for Chlorine
LOW RANGE by holding ZERO/SET (see
page 13).

• When the LCD displays “701”, it is ready.

• Fill the cuvet with 10 mL of unreacted sample,
up to the mark, and replace the cap.

DISPLAY ELEMENTS DESCRIPTION

1) four digit main display area.

2) CAL: appears when the instrument operates in the calibration mode.

3) the Month and Day icons appear above the number of month and day when a date is
displayed.

4) the blinking “Battery” icon appears when the battery voltage is getting low.

• Place the cuvet into the holder and ensure
that the notch on the cap is positioned
securely into the groove.

• Press ZERO/SET and “SIP” will blink on the
display.

• After a few seconds the display will show
“-0.0-”. The meter is now zeroed and ready for
measurement.

• Remove the cuvet from the instrument. Remove
the cap.

• Add the content of one packet of HI 93701-0
Free Chlorine reagent. Replace the cap and
shake gently for 20 seconds.

• Replace the cuvet into the holder and ensure
that the notch on the cap is positioned
securely into the groove.

GUIDE TO DISPLAY CODES

This prompt appears for 1 second each time the instrument is
turned on.

The parameter code, “771” for chlorine ULTRA HIGH RANGE
or “701” for chlorine LOW RANGE, indicates that the meter is
in a ready state and zeroing can be performed.

Sampling in Progress. This
the meter is performing a measurement.

This indicates that the meter is in a zeroed state and
measurement can be performed.

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 your dealer or the nearest
Hanna Customer Service Center.

flashing prompt appears each time

16

9

The blinking "BAT" indicates that the battery voltage is getting
low and the battery needs to be replaced.

This indicates that the battery is dead and must be replaced.
Once this indication is displayed, the meter will lock up. Change
the battery and restart.

“Configuration”: this indicates that the meter has lost its
configuration. Contact your dealer or the nearest Hanna Customer
Service Center.

CALIBRATION MODE MESSAGES

The date of the last calibration appears on the LCD each time the

calibration mode is entered. If calibration is performed for the

first time, “F.CAL” appears.

This indicates that the factory calibration is selected.

• Replace the cuvet into the holder and
ensure that the notch on the cap is
positioned securely into the groove.

• Hold READ/TIMER
display will show the countdown prior to
measurement.
Alternatively, wait for 1 minute and just
press READ/TIMER.
In both cases “SIP” will blink during
measurement.

• The instrument directly displays
concentration in mg/L of chlorine on the
Liquid Crystal Display.

for three seconds. The

or

The flashing digits indicate that:

1) the month can be set

2) the day can be set

“Storage”: this prompt appears for 1 second at the end of the
calibration procedure, to indicate that the calibration data has
been stored.

“Error”: the concentration of the calibration solution used is not
correct. Repeat the calibration procedure with the right standard
solution, and verify it is not expired. If the calibration procedure fails
again, contact your dealer or the nearest Hanna Customer Service
Center.

10

INTERFERENCES

Bromine (positive error) Oxidized Manganese and Chromium (positive error)
Chlorine dioxide (positive error) Ozone (positive error)

Iodine (positive error)

15

MEASUREMENT PROCEDURE

ERROR MESSAGES

MEASUREMENT PROCEDURE FOR 771

• Select the parameter code “771” for Chlorine
ULTRA HIGH RANGE by holding ZERO/SET
(see page 13).

• When the LCD displays “771”, it is ready.

• Fill the cuvet with 10 mL of unreacted
sample, up to the mark, and replace the
cap.

• Place the cuvet into the holder and ensure
that the notch on the cap is positioned
securely into the groove.

• Press ZERO/SET and “SIP” will blink on the
display.

• After a few seconds the display will show
“-0.0-”. The meter is now zeroed and ready for
measurement.

• Remove the cuvet from the instrument. Remove
the cap.

• Add the content of one packet of
HI 95771A-0 Chlorine Ultra HR reagent A.

a) on zero reading

This indicates that the zeroing procedure failed due to a low signal­to-noise ratio. In this case press ZERO again.

“No Light”: the instrument cannot adjust the light level. Please check
that the sample does not contain any debris.

“Light Low”: there is not enough light to perform a measurement.
Please check the preparation of the zero cuvet.

“Light High”: there is too much light to perform a measurement.
Please check the preparation of the zero cuvet.

b) on sample reading

There is too much light for the sample measurement. Please check
if the right sample cuvet is inserted.

“Inverted”: the sample and the zero cuvet are inverted.

“Zero”: a zero reading was not taken. Follow the instruction in
the measurement procedure for zeroing the meter.

Under range. A blinking "0" for 771 or “0.00” for 701 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.

A flashing value of the maximum concentration (i.e. “500” for
chlorine Ultra High Range 771 or “5.00” for chlorine Low Range

701) indicates an over range condition. The concentration of the
sample is beyond the programmed range: dilute the sample and
re-run the test.

• Add the content of one packet of
HI 95771B-0 Chlorine Ultra HR reagent B.
Replace the cap and shake gently for 20
seconds.

14

A flashing value lower than the maximum concentration (i.e.
“200” for chlorine Ultra High Range 771 or “2.00” for chlorine
Low Range 701) indicates a low signal-to-noise ratio condition.
In this case accuracy of the result is not guaranteed. Repeat the
measurement procedure.

11

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

• Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost.

The instructions listed below should be carefully followed during testing to ensure best accuracy.

• For a correct filling of the cuvet: the liquid in the
cuvet forms a convexity on the top; the bottom of
this convexity must be at the same level of the 10
mL mark.

• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.

(a) (b) (c)

• It is important that the sample does not contain any
debris. This would corrupt the reading.

• It is possible to take multiple readings in a row, but it is recommended to take a new zero
reading for each sample and to use the same cuvet for zeroing and measurement.

• After the reading it is important to discard immediately the sample, otherwise the glass
might become permanently stained.

• All the reaction times reported in this manual are referred to 20°C (68°F). As a general rule
of thumb, they should be doubled at 10°C (50°F) and halved at 30°C (86°F).

• In order to maximize accuracy, prior to a measurement follow the validation procedure to
be sure that the instrument is properly calibrated. If necessary, calibrate the instrument.

OPERATIONAL GUIDE

• Turn the meter on by pressing ON/OFF.

• When the LCD displays “771” is ready: the Chlorine ULTRA HIGH
RANGE scale is automatically selected each time the instrument is
turned on.

• To change parameter keep ZERO/SET pressed. The parameter code
will change every three seconds, until the key is released. Select the
program for “771” for chlorine ULTRA HIGH RANGE or “701” for
chlorine LOW RANGE

• Each time the cuvet is used, the cap must be
tightened to the same degree.

• Whenever the cuvet is placed into the measurement
cell, it must be dry outside, and completely free of
fingerprints, oil or dirt. Wipe it thoroughly with
HI 731318 or a lint-free cloth prior to insertion.

• Shaking the cuvet can generate bubbles in the sample,
causing higher readings. To obtain accurate
measurements, remove such bubbles by swirling or
by gently tapping the vial.

12

Code Parameter
771 Chlorine Ultra High Range
701 Chlorine Low Range

• After the desired parameter code appears on the display, perform
either MEASUREMENT, VALIDATION, or CALIBRATION PROCEDURE
following the instructions reported in the related chapter.

Important Note: chlorine ULTRA HIGH RANGE and chlorine LOW
RANGE have to be measured separately with fresh unreacted samples
if both values are requested.

13

or