LaMotte AR-42 - Manual (Page 4)

4
7.
TOTAL HARDNESS TEST PROCEDURE
Add 1 Hardness
Reagent #6 Tablet
(4484).
Swirl to mix.
While gently swirling the tube, add
Hardness Reagent #7 (4487WT)
one drop at a time until the red
color changes to blue.
Count the number of
drops added.
Hold bottle
vertically.
Multiply the number of drops used in Step 6 as follows:
upper line:
multiply by 10 = ppm Hardness as CaCO
middle line: multiply by 1 = gpg Hardness as CaCO
lower line: multiply by 20 = ppm Hardness as CaCO
3
3
3
Fill the test tube (4488) to the desired line with the
sample water.
upper line:
1 drop = 10 ppm CaCO
middle line: 1 drop = 1 gpg CaCO
lower line: 1 drop = 20 ppm CaCO .
3
3
3
Add 5 drops
of *Hardness
Reagent #5
(4483).
1.
10
1
20
10
1
20
10
1
20
10
1
20
10
1
20
Swirl until
tablet has
disintegrated.
Solution will
turn red.
10
1
20
2. 3.
4. 5.
6.