Hanna Instruments HI 95707 User Manual

Instruction Manual

HI 95707C

Nitrite Low Range ISM

MAN95707CR3 06/06

www.hannainst.com www.hannainst.com

This Instrument is in

Compliance with the CE Directives

120

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 ................................................................................................... 5

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

FUNCTIONAL DESCRIPTION ................................................................................................... 7

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

GENERAL TIPS FOR AN ACCURATE MEASUREMENT .................................................................11

MEASUREMENT PROCEDURE ................................................................................................13

VALIDATION PROCEDURE .....................................................................................................15

CALIBRATION PROCEDURE ...................................................................................................16

BATTERY REPLACEMENT .......................................................................................................18

ACCESSORIES .....................................................................................................................18

CE DECLARATION OF CONFORMITY........................................................................................19

WARRANTY .........................................................................................................................19

CE DECLARATION OF CONFORMITY

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 95707 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.

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 19

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

products without advance notice.

FACTORY CALIBRATION RESET

It is possible to restore factory calibration:

• Enter the calibration mode by holding CAL CHECK

for three seconds.

• Hold ZERO for 10 seconds. The display will show
for 2 seconds “F.CAL” and "707" appears. The
factory calibration is automatically restored and
the instrument is ready for measurement.

BATTERY REPLACEMENT

Battery replacement must only take place in a non­hazardous 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.

PRELIMINARY EXAMINATION

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

Each HI 95707 Ion Selective Meter is supplied complete with:

• Two Sample Cuvets and Caps

• 9V Battery

• Scissors

• Two CAL CHECK™ Cuvets (HI 95707-11) with Quality Certificate

• Tissue for wiping cuvets

• Instruction Manual and Quick Reference Guide

• Instrument Quality Certificate

• Rigid carrying case

9V

SLIDE

OFF

ACCESSORIES

REAGENT SETS
HI 93707-01 Reagents for 100 Nitrite Low Range tests
HI 93707-03 Reagents for 300 Nitrite Low Range tests
OTHER ACCESSORIES
HI 95707-11 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)

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

Any defective item must be returned in its original packing.

318

GENERAL DESCRIPTION

The HI 95707 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 95707 meter measures the

Nitrogen-Nitrite Nitrogen-Nitrite

Nitrogen-Nitrite (NO

Nitrogen-Nitrite Nitrogen-Nitrite
(ppm) range, in drinking, surface and saline water samples and in domestic and industrial wastes. The
method is an adaptation of an EPA approved method.

The reagent is in

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

ensure the maximum repeatability.

–

-N) content in the 0.000 to 0.600 mg/L

2

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

• The instrument will show for three seconds the
CAL CHECK™ standard value.

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 the CAL CHECK™
Standards HI 95707-11 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
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.

or

ABBREVIATIONS

°C:

degree Celsius

°F:

degree Fahrenheit

mg/L:

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

mL:

milliliter

EPA:

Environmental Protection Agency (USA)

4 17

• When both the day and month have been selected,
hold CAL CHECK

for three seconds to 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 "707" on the
LCD.

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™ 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).

CALIBRATION PROCEDURE

• Turn the meter on by pressing ON/OFF.
When the LCD displays “707”, it is ready.

• Enter the calibration mode by holding CAL CHECK

for three seconds.

• 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 18.

• 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 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 95707-11
Cuvet B into the holder and ensure that the notch
on the cap is positioned securely into the groove.

or

SPECIFICATIONS

SPECIFICATIONS

Range 0.000 to 0.600 mg/L (as NO
Resolution 0.001 mg/L
Precision ±0.001 mg/L @ 0.100 mg/L
Typical EMC Deviation ±0.001 mg/L
Light Source Tungsten lamp with narrow band interference filter @ 525 nm
Light Detector Silicon Photocell
Method Adaptation of an EPA approved method. The reaction between Nitrite

and the reagent causes a pink 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 93707-0 Nitrite Low Range Reagent 1 packet

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

–

-N)

2

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

0.100 mg/L Nitrogen-Nitrite and a
representative lot of reagent, an operator
obtained with a single instrument a standard
deviation of 0.001 mg/L.

516

PRINCIPLE OF OPERATION

VALIDATION PROCEDURE

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

physical-chemical characteristics of the substance according to the Lambert-

Beer Law:

-log I/I

= ε

o

λ

c d

or

A = ε

c d

λ

Where:

-log I/I

= Absorbance (A)

o

I

= intensity of incident light beam

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.

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.

HI 95 series block diagram (optical layout)

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))]

• Turn the meter on by pressing ON/OFF.
When the LCD displays “707”, it is ready.

• 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 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
validation.

• Remove the cuvet and place the CAL CHECK™
Standard HI 95707-11 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 found is 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.

6 15

• Hold READ/TIMER for three seconds. The display
will show the countdown prior to measurement.

Alternatively, wait for 15 minutes and just press
READ/TIMER.

In both cases “SIP” will blink during
measurement.

• The instrument directly displays concentration in
mg/L of nitrogen-nitrite (NO

–

-N) on the Liquid

2

Crystal Display.

–

• To convert the NO
ion concentration (NO

-N concentration to the nitrite

2

–

), multiply the reading by

2

factor of 3.29.

–

• To convert the NO
nitrite concentration (NaNO

-N concentration to sodium

2

), multiply the reading

2

by factor of 4.93.

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

or

intensity I
The photoelectric cell collects the radiation I that is not absorbed by the sample and converts it into

or I.

o

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.

INTERFERENCES

Highly buffered samples (alkalinity above 500 ppm) or with extreme pH may exceed the buffering
capacity of the reagent: neutralize acidic samples with diluted NaOH or alkaline samples with diluted
HCl, prior to addition of the reagent.

Turbidity must be removed by prior filtration.
The following ions may cause negative errors:
cupric ions (Cu
ferrous ions (Fe
ferric ions (Fe

2+

): above 5 ppm

2+

): above 1 ppm

3+

): above 2 ppm

FUNCTIONAL DESCRIPTION

1) Liquid Crystal Display (LCD)

2) Cuvet Holder

3) Cuvet alignment indicator

4) ON/OFF key

5) ZERO key

6) READ/TIMER key

7) CAL CHECK key

714

KEYPAD DESCRIPTION

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

• ZERO: to zero the meter prior to measurement.

• 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.

MEASUREMENT PROCEDURE

Turn the meter on by pressing ON/OFF and follow instruction manual to perform either the
MEASUREMENT, VALIDATION or CALIBRATION PROCEDURE.

MEASUREMENT PROCEDURE

• Turn the meter on by pressing ON/OFF.

OPERATING MODES

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

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

icon appears), it enables calibration of the instrument.

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.

for three seconds (the “CAL”

• When the LCD displays “707”, 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 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.

• Add the content of one packet of HI 93707-0
Nitrite Low Range reagent. Replace the cap and
shake gently for 15 seconds.

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

8 13

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

GUIDE TO DISPLAY CODES

• In order to avoid reagent leaking and to obtain more
accurate measurements, it is recommended to close
the cuvet first with the supplied HDPE plastic stopper
and then with the black cap.

• 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
fingerprints, oil or dirt. Wipe it thoroughly with
HI 731318 (tissue for wiping cuvets, see chapter
ACCESSORIES) or a lint-free cloth prior to insertion.

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

• 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.

completely free of

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

This indicates that the meter is in a ready state and zeroing can be
performed.

Sampling in Progress. This
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.

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.

flashing prompt appears each time the

912

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.

ERROR MESSAGES

a) on zero reading

Under range. A blinking "0.000" 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 indicates an over
range condition. The concentration of the sample is beyond the
programmed range: dilute the sample and re-run the test.

A flashing value lower than the maximum concentration indicates a
low signal-to-noise ratio condition. In this case accuracy of the result
is not guaranteed. Repeat the measurement procedure.

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

This indicates that the zeroing procedure failed due to a low signal-to­noise 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.

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

• Remove suspended solids by filtration.

• 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)

10 11