97
8.27. HARDNESS, TOTAL LOW RANGE
SPECIFICATIONS
Range 0 to 250 mg/L (as CaCO
3
)
Resolution 1 mg/L
Accuracy ±5 mg/L ±4% of reading at 25 °C
Light Source LED with narrow band interference filter @ 466 nm
Method Adaptation of the EPA recommended method 130.1.
REQUIRED REAGENTS
Code Description Quantity
HI93735IND‑0 Hardness Indicator Reagent 0.5 mL
HI93735A‑LR Hardness Low Range Reagent A 9 mL
HI93735B‑0 Hardness Buffer Reagent B 2 drops
HI93735C‑0 Fixing Reagent 1 packet
REAGENT SETS
HI93735‑00 Reagents for 100 tests (LR, 0 to 250 mg/L)
HI93735‑0 Reagents for 300 tests (LR ‑ 100 tests, MR ‑ 100 tests, HR ‑ 100 tests)
For other accessories see page 200.
MEASUREMENT PROCEDURE
• Select the Hardness Total LR method using the
procedure described in the Method Selection section
(see page 18).
• Add 0.5 mL of unreacted sample to the cuvette. Add
0.5 mL of HI93735IND‑0 Hardness Indicator Reagent.
• With the plastic dropper fill the cuvette up to the
10 mL mark with HI93735A‑LR Hardness Low
Range Reagent A.
• Add two drops of HI93735B‑0 Hardness Buffer
Reagent B. Replace the cap and invert 5 times to
mix.
HARDNESS, TOTAL LOW RANGE
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