Analysis of the working principle of the new conductivity meter
Conductivity tester is a high-end water quality management and automation that operates in higher temperature environment for medical multi-effect distilled water system, boiler bottom water, condensate water, heat exchange system, industrial thermal cleaning of mechanical parts, industrial circulating water, etc. Control developed an online water quality analysis instrument with a wide temperature range.
The conductivity meter is a multi-range instrument that can meet the testing requirements of various applications from deionized water to seawater. This instrument can provide automatic temperature compensation and set the temperature coefficient, so it can be used to measure liquid samples with different temperature coefficients than water. It can provide three ranges and has a range automatic selection function, which can automatically select the most suitable range during detection.
Overview
Chinese online conductivity meter is a new generation of all-Chinese micro-model high-end instruments, with all Chinese display, Chinese menu operation, full intelligence, multi-function, high measurement performance, strong environmental adaptability and other characteristics. The secondary meter is equipped with an electrode with a constant of 1.0 or 10 to measure the conductivity of general liquids; with an electrode of 0.1 or 0.01, it can accurately measure the conductivity of pure or ultra-pure water, especially suitable for power plant boiler feed water and steam condensation On-line continuous monitoring of conductivity of high purity water such as water.
Conductivity controllers such as pen-type BCNSCAN10 / 20/30, portable BEC520, BEC530, BEC531, BEC540, laboratory desktop BEC950, BEC110, BEC120, BEC307 and online BEC200A, BEC200B, BEC200D, BEC200E, BEC200F, BEC210, etc. are widely used Industry, power, agriculture, medicine, food, scientific research and environmental protection. The instrument is also an essential inspection device for QS and HACCP certification in food factories and drinking water factories.
Working principle
Conductivity is the ability of a solution to conduct current in numbers. The conductivity of water has a certain relationship with the amount of inorganic acids, alkalis and salts it contains. When their concentration is low, the conductivity increases with the increase of the concentration. Concentration or salt content.
Water quality hardness unit conversion
Hardness unit ppm German hardness French hardness British hardness
1ppm = 1.000ppm 0.0560 0.1 0.0702
1 German hardness = 17.847ppm 1 1.7847 1.2521
1 French hardness = 10.000ppm 0.5603 1 0.7015
1 British hardness = 14.286ppm 0.7987 1.4285 1
Electrical conductivity and water hardness
The conductivity of the aqueous solution is directly proportional to the dissolved solids concentration, and the higher the solids concentration, the greater the conductivity. The relationship between conductivity and dissolved solids concentration is approximately expressed as: 1.4 μS / cm = 1 ppm or 2 μS / cm = 1 ppm (CaCO3 per million units). The total hardness value of water can be obtained indirectly by using a conductivity meter or a total solids dissolution meter. As mentioned above, for the convenience of approximate conversion, 1μs / cm conductivity = 0.5ppm hardness, but please note:
(1) The hardness of water is measured indirectly by conductivity, the theoretical error is about 20-30ppm
(2) The conductivity of the solution determines the movement of the molecule, and temperature affects the movement of the molecule. In order to compare the measurement results, the test temperature is generally set to 20 ℃ or 25 ℃
(3) Using reagent detection can obtain more accurate water hardness value.
Soft water and hard water
Water is divided into soft water and hard water. Any water that does not contain or contains a small amount of calcium and magnesium ions is called soft water, otherwise it is called hard water. The hardness component of water, if it is caused by sodium bicarbonate or magnesium bicarbonate, is temporary hard water (boiling temporary hard water, decomposed sodium bicarbonate, precipitated by the formation of insoluble carbonate, and the water changes from hard water to soft water) ; If it is caused by sulfate or chloride containing calcium and magnesium, it is permanent hard water. According to the total hardness value of water, the total hardness of 0-30ppm is called soft water, the total hardness of more than 60ppm is called hard water, the high-quality drinking water does not exceed 25ppm, and the total hardness of high-quality soft water is less than 10ppm. In natural water, rainwater and snow water that are far away from the city without pollution are soft water; spring water, stream water, river water, and reservoir water are mostly temporary hard water, and some groundwater is high hardness water.
Industrial Conductivity
Electrical conductivity is the ability of a substance to transmit current, as opposed to the resistance value, in units of Siemens / cm.
Performance characteristics
â— All Chinese display, friendly interface: All data, status and operation prompts are displayed in Chinese, no symbols or codes defined by the manufacturer.
â— Simple menu structure, text-based dialogue between people: It is clearer and more convenient to use, and can be operated according to the prompts on the screen.
â— Simultaneous display of multiple parameters: Simultaneous display of conductivity, output current, temperature, time and status.
◠(ultra) pure water automatic compensation: for ultrapure water, it realizes the automatic temperature compensation of conductivity when displaying 25 ℃.
â— Notepad function: faithfully record the operation of the instrument and the occurrence time of the alarm, which is convenient for management.
â— Historical curve and digital recorder function: The secondary meter automatically stores the measurement data every 5 minutes, and can continuously store the conductivity for one month.
â— Digital clock function: Display the current time and provide a time reference for the digital recorder function.
â— Backlight function: It can be used in a dimly lit or completely dark environment, and automatically adjust the contrast to the clearest according to temperature changes.
â— Anti-program flying death: Watchdog program ensures that the instrument will not crash, which is the basic requirement of online instrument.
â— Output current setting and checking function: manual current source function, you can check and set the output current value arbitrarily, which is convenient for testing recorder and lower computer.
â— The current output mode set by the software: the software selects 0 ~ 10mA or 4 ~ 20mA output.
Pros and cons
The pen-shaped conductivity meter is generally made into a single range with a narrow measurement range, and is a dedicated and convenient instrument. The pen shape is also made into a TDS meter, used to measure the quality of drinking water, and a salinity meter to measure the salinity of soup (solution).
Portable and laboratory conductivity meters have a wide measurement range and are commonly used instruments. The difference is that the portable DC power supply can be carried to the site. The laboratory conductivity meter has a wide measurement range, multiple functions and high measurement accuracy.
The characteristics of industrial conductivity meters are good stability, reliable operation, certain measurement accuracy, strong environmental adaptability, strong anti-interference ability, analog output, digital communication, upper and lower limit alarm and control functions.
Precautions
How to use conductivity meter
The conductivity meter is suitable for the precise measurement of various liquid media. The conductivity meter is mainly used to accurately measure the conductivity value of the liquid medium. When equipped with a corresponding constant electrode, it can accurately measure the conductivity of high-purity water. Can be widely used in drinking water and sewage, chemistry, petrochemical, pulp and paper, food and beverage, sugar, steel, surface treatment, steam power generation and electronic products, semiconductor, pharmaceutical industry.
1. Check if the pointer is zero, if not, adjust the zero adjustment knob on the conductivity meter,
2. Adjust the conductivity meter to the calibration file, the pointer points to the maximum scale,
3. According to the electrode constant adjustment knob, adjust to the measurement file during measurement.
Precautions for use
1. The lead of the electrode must not be wet, otherwise the measurement will be inaccurate.
2. After the high-purity water is put into the container, it should be measured quickly, otherwise the conductivity will rise quickly because the CO2 in the air dissolves into the water and becomes carbonate ions.
3. The container holding the solution to be tested must be clean and free from ion contamination.
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