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HI 93725

pH & Total Hardness

HI 93725 - pH & Total HardnessHI 93725 - pH & Total Hardness

HI 93725 - pH & Total Hardness

The HI 93725 meter measures pH and Magnesium/Calcium and Total

Hardness content in water and wastewater.

SPECIFICATIONS

Range pH 5.9 to 8.5

Mg Hardness 0.00 to 2.00 mg/L

Ca Hardness 0.00 to 2.70 mg/L

Total Hardness 0.00 to 4.70 mg/L

Resolution pH 0.1

Hardness 0.01 mg/L

Accuracy pH ±0.1

Hardness ±0.11 mg/L ±5% of reading)

Typical EMC pH ±0.1

Deviation Hardness ±0.02 mg/L

Light Source Light Emitting Diode @ 555 nm

Method For pH, Phenol red method. The reaction with

reagent causes a red tint in the sample.

For total hardness, adaptation of the Standard

Methods for the Examination of Water and

Wastewater, 18

edition, Calmagite/colorimet-

ric method. The reaction between hardness and

reagents causes a maroon tint in the sample.

IODINE MEASUREMENTIODINE MEASUREMENT

IODINE MEASUREMENT

ZERO

• Fill the cuvet up to the mark with 10 mL of

unreacted sample and replace the cap.

• Place the cuvet into the holder and en-

sure that the notch on the cap is

positioned securely into the groove.

• Press ZERO and "SIP" will appear on the display.

• Wait for a few seconds and the display will

show "-0.0-". Now the meter is zeroed and

ready for measurement.

• Remove the cap and add the content of

one packet of HI 93718 reagent. Re-

place the cap and shake gently.

• Reinsert the cuvet into the instrument.

• Wait for 2 minutes and 30 seconds and press READ. "SIP" will

appear during measurement.

• The instrument directly displays concentration in mg/L of iodine

on the Liquid Crystal Display.

Iodine

10 mL