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TOTAL HARDNESS MEDIUM RANGE TOTAL HARDNESS MEDIUM RANGE
TOTAL HARDNESS MEDIUM RANGE TOTAL HARDNESS MEDIUM RANGE
TOTAL HARDNESS MEDIUM RANGE
Total Hardness MR
SPECIFICATIONS
Range 200 to 500 mg/L
Resolution 5 mg/L
Accuracy ±7 mg/L ±3% of reading
Typical EMC ±5 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference
filter @ 466 nm
Method Adaptation of the EPA method 130.1. The reac-
tion between calcium, magnesium and reagents
causes a red-violet tint in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93735A-MR Hardness Indicator reagent MR 9.5 mL
HI 93735B-0 Hardness Buffer reagent 2 drops
HI 93735C-0 Fixing reagent 1 packet
REAGENT SETS
HI 93735-01 Reagents for 100 tests Medium Range
(200 to 500 mg/L)
HI 93735-0 Reagents for 100 tests (0 to 750 mg/L)
For other accessories see page 141.
MEASUREMENT PROCEDURE
• Select the program number corresponding to Total Hardness MR
on the secondary LCD by pressing PROGRAM W and V.
• Using the syringe, add exactly 0.5 mL of
unreacted sample to the cuvet.
• With the plastic pipette
fill the cuvet up to the
10 mL mark adding HI
93735A-MR Indicator re-
agent.
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