User Guide

TOTAL HARDNESS LOW RANGE TOTAL HARDNESS LOW RANGE

TOTAL HARDNESS LOW RANGE

SPECIFICATIONS

Range 0 to 250 mg/L

Resolution 1 mg/L from 0 to 100 mg/L

5 mg/L from 100 to 250 mg/L

Accuracy ±5 mg/L ±4% 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-LR Hardness Indicator reagent LR 9.5 mL

HI 93735B-0 Hardness Buffer reagent 2 drops

HI 93735C-0 Fixing reagent 1 packet

REAGENT SETS

HI 93735-00 Reagents for 100 tests Low Range (0 to 250 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 LR

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-LR Indicator

reagent.

Total Hardness LR