Boiler water hardness testing method and steps

Generally speaking, the total content of bicarbonate, chloride, sulfate and nitrate in water is the total hardness. The hardness of calcium and magnesium salts in the water will cause boiler scaling, reduce the boiler heat transfer coefficient, the boiler scaling after the local overheating, burn out the pipe, which is unfavorable to safe operation and scale, water slag will block the pipe and deteriorate the water circulation of the boiler, so the hardness is an important parameter of boiler water detection. With Erun ERUN-ST-MU 97 desktop multi-parameter water quality detector, the detection methods and steps of boiler water total hardness are explained in detail.

First, before use, the total hardness "reagent 1" is diluted 5 times with distilled water according to the amount of use before use (for example：1 mL reagent plus 4mL of distilled water).

1.the preparation of blank samples

Take 20.0mL distilled water in the colorlet tube, add 1.0 mL reagent 1,2.0mL reagent 2, shake and place for 5min.

2.preparation of sample 

When the total hardness concentration is (total hardness _L)0.10~5.00mg/L: take the sample to be tested 20.0mL in a clean color tube, add 1.0 mL reagent 1, add 2.0 mL test 2, shake the plug and place it for 5min.

When the total hardness concentration is (total hardness _H)5.0~50.00mg/L: take 2.0 mL sample in the color tube, supplement 18.0mL, add 1.0mL reagent 1, add 2.0mL reagent 2, plug well and place well for 5min.

3. equipment boot

Connect the power cord and turn on the switch.

4. Blank measurement

Under the main menu, click "Curve Selection" and select the corresponding curve. Then wipe the blank to be tested, will Put the colorimetric tube into the colorimetric hole, under the main menu, click the "blank measurement" item, after the light absorption value is stable, press " Yes Recognition " key to confirm, the instrument automatically adjust zero.

5. sample measurement

Wipe the sample color tube and put it in the color hole. Under the main menu, click "Sample Measurement" item for the instrument Enter the sample measurement interface and directly display the total hardness concentration value (mg/L).

6. After the testing is completed

After the measurement is completed, clean the colorlet tube and dry for later use. Shutdown the device and disconnect the power supply.

7. Principle of measurement

At pH 10.0, the acidic chromium blue K has the same maximum absorption wavelength as the complexes formed by calcium and magnesium, and generally agrees with ε Mg and ε Ca. Under certain conditions, the color of the complex is proportional to the total content of calcium and magnesium ions.

The above is the detection method and detailed steps of boiler water. If you need to know the detailed information of the instrument, you can directly contact the customer service team. The customer service team of Erun environmental protection will serve you at any time.