Hanna Instruments HI 93728 User Manual

Instruction Manual

ON

OFF

ZERO

READ

DIRECT

READ

TIMED

HI 93728

NITRATE

Range: 0.0..30.0 ppm

HI 93728

Nitrate ISM

www.hannainst.com

WARRANTY

HI 93728 is warranted for two years against defects in
workmanship and materials when used for its intended purpose and
maintained according to 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 the dealer from whom you purchased the

instrument. 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.

Hanna Instruments reserves the right to modify the design, construction
and appearance of its products without advance notice.

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
operation of the meter. 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
EN 50081-1 and EN 50082-1.

PRELIMINARY EXAMINATION

Remove the instrument from the packing material and
examine it carefully to make sure that no damage has
occurred during shipment. If there is any damage, notify
your Dealer.

Each Ion Specific Meter is supplied complete with

• 9V Battery

• Two Sample Cuvets and Caps

• One Transport Cap

Note: Conserve all packing material until the instrument

has been observed to function correctly. Any defective
item must be returned in its original packing.

GENERAL DESCRIPTION

The HI 93728 meter measures the nitrate-nitrogen (NO
N) content in water and wastewater in the 0.0 to 30.0 mg/
L (ppm) range.

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 powder form and are supplied in
packets. The amount of reagent is precisely dosed to ensure
maximum repeatability.

Display codes aid the user in routine operations.
The meters have an auto-shut off feature that will turn the

instrument off after 10 minutes of non-use.

3

SPECIFICATIONS

DISPLAY CODE GUIDE

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

Sampling in Progress. This prompt

CUVET HOLDER

CUVET ALIGNMENT
INDICATOR

ON/OFF

ZERO

READ TIMED

appears each time the meter is performing
a measurement.

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

A zero reading was not taken. Insert a
sample before adding reagent and press
ZERO.

Under range. A blinking "0.00" indicates
that the sample absorbs less light than

READ DIRECT

the zero reference. Check the procedure
and make sure you use the same cuvet

SPECIFICATIONS

Range 0.0 to 30.0 mg/L
Resolution 0.1 mg/L
Accuracy ±0.5 mg/L ±10% of reading
Typical EMC ±0.1 mg/L

Deviation

–

-

Light Source Light Emitting Diode @ 555 nm
Method Adaptation of the cadmium reduction

method. The reaction between nitrate­nitrogen and the reagent causes an amber
tint in the sample

Light Detector Silicon Photocell
Environment 0 to 50°C (32 to 122°F);

max 95% RH non-condensing

Battery Type/Life 1 x 9 volt/40 hours
Auto-Shut off After 10' of non-use
Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8")
Weight 290 g (10 oz.).

V

REQUIRED REAGENTS

Code Description Quantity

HI 93728-0 Powder reagent 1 packet

REAGENT SETS

HI 93728-01 Reagents for 100 tests
HI 93728-03 Reagents for 300 tests

for reference (zero) and measurement.
Over range. A flashing value higher than

the maximum concentration readable (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 your dealer
or the nearest Hanna Customer Service
Center.

Light under range. The zero sample is
too dark for proper zeroing. If this is not
the case, contact your dealer or the
nearest Hanna Customer Service Center.

The "V" 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.

Note: once this indication is displayed,
the meter will lockup. Change the
battery to restart.

OPERATIONAL GUIDE

MEASUREMENT PROCEDURE

• Turn the meter on by pressing
ON/OFF.

• When the LCD displays "- - -",
it is ready.

• Add to the cuvet 6 mL of
sample 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 appear on the display.

ZERO

• Wait for a few seconds and
the display will show "-0.0-".
Now the meter is zeroed and
ready for measurement.

• Remove the cuvet and add
the content of one packet of
HI 93728 reagent.

OFF

ON

• Reinsert the cuvet into the
instrument, taking care not
to shake it.

• Press READ TIMED and the display will show the countdown
prior to the measurement or, alternatively, wait for 4
minutes and 30 seconds and press READ DIRECT. In
both cases "SIP" will appear during measurement.

4’30"

12

9

3

6

READ

TIMED

READ

DIRECT

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

• To convert the reading to mg/L of nitrate (NO

–

3

multiply by a factor of 4.43.

INTERFERENCES

Interference may be caused by:
Ammonia and amines, as urea and primary aliphatic

amines
Chloride above 100 ppm (negative interference)
Chlorine above 2 ppm (positive interference)
Copper (it must be absent)
Iron (III) (positive interference)
Strong oxidizing and reducing substances
Sulfide (it must be absent)

TIPS FOR AN ACCURATE

MEASUREMENT

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

• Do not touch the cuvet walls with hands.

• 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.

• Do not let the 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 thoroughly with HI 731318 or a lint-free cloth

REAGENT SETS

HI 93728-01 Reagents for 100 tests
HI 93728-03 Reagents for 300 tests

OTHER ACCESSORIES

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 731321 Glass cuvets (4 pcs)
HI 731325 Caps for cuvets (4 pcs)
HI 93703-50 Cuvets cleaning solution (230 mL).

ACCESSORIES

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

CE DECLARATION

OF CONFORMITY

sample and that the same cuvet is used for zeroing and
measurement.

• It is important to discard the sample immediately after
the reading is taken because the glass may become
permanently stained.

• 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.

• 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).

• Replace the cap and
immediately shake
vigorously for exactly
10 seconds by
moving the cuvet up
and down. Continue
to mix by inverting
the cuvet gently and
slowly for 50 seconds,
while taking care not to induce air bubbles. A deposit could
remain but it does not affect the measurement. Time and
way of shaking could sensitively affect the measurement.

Note: To ensure accurate results, perform the tests at room

temperature, between 18°C and 28°C (65F to 83F).

For best results: Intensely colored samples or suspended

matter in large amounts will cause interference.
Therefore sample should be adequately treated before
performing the test.

BATTERY REPLACEMENT

Battery replacement must only take place in a non-hazardous
area using a 9V alkaline battery.

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.
Replace the battery and the cover.

9V

SLIDE

OFF

Recommendations for Users

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

Operation of these instruments in residential area could cause unacceptable interferences
to radio and TV equipments, 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 perform any measurement in microwave ovens.

IST93728R3 10/02