Hanna Instruments HI 93751 User Manual

Instruction Manual

V

HI 93751

Sulfate ISM

www.hannainst.com

Warranty

HI 93751 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.

Compliance with the CE Directives

This Instrument is in

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.

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 93751 meter measures the sulfate content in water,
wastewater and seawater in the 0 to 150 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 reagent is in powder form and is supplied in packet.
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.

Specifications Display Code Guide

This indicates that the meter is in a
ready state and zeroing 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
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
the zero reference. Check the procedure
and make sure you use the same cuvet
for reference (zero) and measurement.

SPECIFICATIONS

Range 0 to 150 mg/L
Resolution 1 mg/L
Accuracy ±1 mg/L ±5% of reading
Typical EMC

Deviation ±1 mg/L
Light Source Light Emitting Diode @ 470 nm
Method Sulfate is precipitated with barium

chloride crystals. Light absorbance of
the suspension is measured.

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

REQUIRED REAGENTS

Code Description Quantity

HI 93751-0 Indicator Reagent 1 packet

REAGENT SETS

HI 93751-01 Reagents for 100 tests

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.

ON

OFF

ZERO

READ

TIMED

9V

SLIDE

OFF

12

3

6

9

1’

Operational Guide Tips for an Accurate Measurement

• Reinsert the cuvet into
the instrument.

MEASUREMENT PROCEDURE

• Turn the meter on by
pressing ON/OFF.

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

• Fill a cuvet up to 1.5 cm
(¾") below the rim with
10 mL of unreacted
sample and replace the
cap.

10m

• Press READ TIMED and the display will show the count­down prior to the measurement or, alternatively, wait
for 5 minutes and press READ DIRECT. In both cases
"SIP" will appear during measurement.

L

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 affected.

• 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
prior to insertion.

• It is important that the sample does not contain any

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

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

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 immediately after

• Press ZERO and "SIP" will appear on the display.

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

INTERFERENCES

Color or suspended matter in large amounts will interfere:
suspended matter should be removed by previous filtration.

Organic matter in large amounts may impede the precipita­tion of barium sulfate.

Calcium (as CaCO3) >20000 mg/L
Chloride (as Cl-) >40000 mg/L
Magnesium (as MgCO3) >10000 mg/L
Silica (as SiO2) >500 mg/L

the reading is taken because the glass might 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 of thumb,
they should be doubled at 10°C (50°F) and halved at
30°C (86°F).

• Remove the cuvet.

Battery Replacement

• Add the content of one
packet of HI 93751-0
reagent

• Shake very gently for 1
minute.

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.

Accessories

REAGENT SETS

HI 93751-01 Reagents for 100 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)

CE Declaration of Conformity

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.

IST93751R2 09/03