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 a 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 dam-
age, notify your Dealer or the nearest Hanna office
immediately.
Each kit is supplied with:
• HI 3841-0 Hardness MR Reagent, 1 bottle (30 mL)
with dropper;
• 1 calibrated plastic vessel (50 mL).
Note:
Any damaged or defective item must be returned in
its original packing materials.
HI 3841
Hardness
Medium Range
Test Kit
ISTR3841R2 07/01
Range
40 to 500 mg/L (ppm) CaCO
3
Smallest Increment
20 mg/L (ppm) CaCO
3
Analysis Method
Drop count titration
Sample Size
50 mL
Number of Tests
50 (average)
Case Dimensions
115x105x80 mm (4.5x4.1x3.1")
Shipping Weight
120 g (4.2 oz.)
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SIGNIFICANCE AND USE
SIGNIFICANCE AND USE
SIGNIFICANCE AND USE
SIGNIFICANCE AND USE
SIGNIFICANCE AND USE
CHEMICAL REACTION
CHEMICAL REACTION
CHEMICAL REACTION
CHEMICAL REACTION
CHEMICAL REACTION
The Hanna Test Kit determines total hardness in water via
a titrimetric method. Calcium and magnesium form a
complex with EDTA and the reaction end-point is indicated
by the change in color of the indicator from red to blue.
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
• Remove the cap from the plastic vessel. Rinse the plastic
vessel with the water sample, and fill it to the 50 mL
mark with the sample.
• Before start adding reagent, check carefully that the
dropper tip is clean. If not, clean it with a soft tissue
before use it.
• Add drops of HI 3841-0 reagent until the color changes
to pink and then to blue (titration end point), while
swirling the sample after each drop and counting the
drops needed to reach the end point.
INSTRUCTIONS
INSTRUCTIONS
INSTRUCTIONS
INSTRUCTIONS
INSTRUCTIONS
The chemicals contained in this test kit are safe in normal
domestic term. Read Health and Safety Data Sheet before
performing the test.
HEALTH AND SAFETY
HEALTH AND SAFETY
HEALTH AND SAFETY
HEALTH AND SAFETY
HEALTH AND SAFETY
REFERENCES
REFERENCES
REFERENCES
REFERENCES
REFERENCES
Adaptation of the E.P.A. recommended 130.2 method.
Historically, water hardness had been defined by the
capacity of water to precipitate soap. The ionic species in
water causing the precipitation were later found to be
primarily calcium and magnesium. Currently, therefore,
water hardness is actually a quantitative measure of these
ions in the water sample.
• Use the Conversion Table or calculate the Hardness:
# of DROPS
*
20
= ppm CaCO
3
1 ppm=1 mg/L=0.1 f=0.0556 D=0.07 E
TABLE 2
TABLE 2
TABLE 2
TABLE 2
TABLE 2
CONVERSION DATA
CONVERSION DATA
CONVERSION DATA
CONVERSION DATA
CONVERSION DATA
TABLE 1
TABLE 1
TABLE 1
TABLE 1
TABLE 1
HARDNESS OF WATER
HARDNESS OF WATER
HARDNESS OF WATER
HARDNESS OF WATER
HARDNESS OF WATER
Drops:
1 - 4
very soft
5 - 8
soft
9 - 12
medium
13 - 16
hard
17
very
hard
NOTE:
NOTE:
NOTE:
NOTE:
NOTE:
ppm : is milligrams CaCO
3
per Liter
f
: French Degrees
D
: German Degrees
E
: English Degrees
Store the reagent bottle out of direct sunlight
To measure: Hardness Low Range use HI 3840 Test Kit
Hardness High Range use HI 3842 Test Kit
Note
: To dose the right drops volume squeeze gently
the reagent bottle.
