Hanna-instruments HI 3812 User Manual download pdf

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

Instruction Manual

www.hannainst.com

Dear Customer,

Thank you for choosing a Hanna Product.

Please read the instructions carefully before using the chemical

test kit. It will provide you with the necessary information for

correct use of the kit.

Remove the chemical test kit from the packing material and

examine it carefully to make sure that no damage has

occurred during shipping. If there is any noticeable damage,

notify your Dealer or the nearest Hanna office immediately.

Each kit is supplied with:

•

Hardness Buffer, 1 bottle with dropper (30 mL);

•

Calmagite Indicator, 1 bottle with dropper (10 mL);

•

HI 3812-0 EDTA Solution, 1 bottle (120 mL);

•

1 plastic beaker (20 mL) with cap;

•

1 plastic beaker (50 mL) with cap;

•

1 syringe (1 mL) with tip.

Note: any damaged or defective item must be returned in its

original packing materials.

ISTR3812R5 01/07

HI 3812

Hardness Test Kit

In history, water hardness was defined by the capacity of

water to precipitate soap. The ionic species in the water

causing the precipitation was later found to be primarily

calcium and magnesium. In the present, therefore, water

hardness is actually a quantitative measure of these ions in

the water sample. It is also now known that certain other ion

species, such as iron, zinc and manganese, contribute to the

overall water hardness. The measure and subsequent control

of water hardness is essential to prevent scaling and clogging

in water pipes. The Hanna Hardness Test Kit makes monitoring

easy, quick and safe. The compact size provides the versatility

to use the kit anywhere. The design of the kit makes it easy

to handle.

Range 0.0 to 30.0 mg/L (ppm) CaCO

0 to 300 mg/L (ppm) CaCO

Smallest Increment 0.3 mg/L [in the 0-30 mg/L range]

3 mg/L [in the 0-300 mg/L range]

Analysis Method EDTA titration

Sample Size 5 mL or 50 mL

Number of Tests 100 (average)

Case Dimensions 200x120x60 mm (7.9x4.7x2.4")

Shipping Weight 460 g (1 lb.)

The hardness level as mg/L (ppm) calcium carbonate is

determined by an EDTA (ethylene-diamine-tetraacetic acid)

titration. The solution is first adjusted to a pH of 10 using a

buffer solution. The indicator chelates with metal ions such as

magnesium or calcium to form a red colored complex. As EDTA

is added, metal ions complex with it. After all the free metal

ions have been complexed, an excess EDTA removes the metal

ions complexed with the indicator to form a blue colored

solution. This color change from red to blue is the endpoint of

the titration.

READ ALL THE INSTRUCTIONS BEFORE USING THE TEST KIT

LOOK AT THE BACK PAGE FOR THE ILLUSTRATED PROCEDURE

Note: push and twist pipet tip into tapered end of syringe

ensuring an air-tight fit.

HIGH RANGE – 0 to 300 mg/L CaCO

• Remove the cap from the small

plastic beaker. Rinse the plastic

beaker with the water sample,

fill to the 5 mL mark and replace

the cap.

• Add 5 drops of Hardness Buffer through the cap port

and mix carefully swirling the beaker in tight circles.

• Add 1 drop of Calmagite Indicator through the cap port

and mix as described above. The solution becomes a red-

violet color.

Standard Methods for the Examination of Water and

Wastewater.

Annual Book of ASTM Standard, vol. 11.01, Water (I).

The chemicals contained in this kit may be hazardous if

improperly handled. Read the relevant Safety Data Sheet

before performing this test.

x 1

x 300 = CaCO

x 30 = CaCO

• Continue adding the titration solution

until the solution becomes purple, then

mix for 15 seconds after each additional

drop until the solution turns blue.

• Read off the milliliters of titration solution from the syringe

scale and multiply by 300 to obtain mg/L (ppm) CaCO

LOW RANGE – 0.0 to 30.0 mg/L CaCO

If result is lower than 30 mg/L, the precision of the test can

be improved by following the procedure below.

• Remove the cap from the large

plastic beaker. Rinse it with the

water sample, fill to the 50 mL

mark and replace the cap.

• Proceed with the titration as for the

high range test.

• Read off the milliliters of titration solution from the syringe

scale and multiply by 30 to obtain mg/L (ppm) CaCO

x 5

Chemical Reaction

Significance and Use

Specifications Instructions

Safety Data Sheets

Accessories

HI 3812-100 replacement kit (100 tests average)

HI 740032P cap for 20 ml plastic beaker (10 pcs)

HI 740034P cap for 50 ml plastic beaker (10 pcs)

HI 740036P 50 ml plastic beaker (10 pcs)

HI 740037P 20 ml plastic beaker (10 pcs)

HI 740142P 1 ml graduated syringe (10 pcs)

HI 740144P tips for 1 ml graduated syringe (10 pcs)

Bibliography

15”

• Take the titration syringe and

push the plunger completely into

the syringe. Insert tip into

HI 3812-0 EDTA Solution and

pull the plunger out until the

lower edge of the seal is on the

0 mL mark of the syringe.

• Place the syringe tip into the

cap port of the plastic beaker

and slowly add the titration

solution dropwise, swirling to

mix after each drop.

1 2

Summary of Contents

Page 1 - Instruction Manual

SPECIFICATIONSSPECIFICATIONSSPECIFICATIONSSPECIFICATIONSSPECIFICATIONS Instruction Manualwww.hannainst.comDear Customer,Thank you for choosing a Hanna

Page 2 - 50 mL sample

HI 3812 HARDNESS TEST KIT55555222223333344444111115 mL sample50 mL samplex5x1

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