User Guide

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.