100
8.28. HARDNESS, TOTAL MEDIUM RANGE
SPECIFICATIONS
Range 200 to 500 mg/L (as CaCO
3
)
Resolution 1 mg/L
Accuracy ±7 mg/L ±3% 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‑MR Hardness Medium Reagent A 9 mL
HI93735B‑0 Hardness Buffer Reagent B 2 drops
HI93735C‑0 Fixing Reagent 1 packet
REAGENT SETS
HI93735‑01 Reagents for 100 tests (MR, 200 to 500 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 MR 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‑MR Hardness Medium Range
Reagent A.
• Add two drops of HI93735B‑0 Hardness Buffer
Reagent B. Replace the cap and invert 5 times to mix.
HARDNESS, TOTAL MEDIUM RANGE
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