Conductivity meter is a high-end water quality management and automation for medical multi-effect distilled water system, boiler bottom water, condensate, heat exchange system, industrial hot cleaning of mechanical parts, industrial circulating water and other high temperature environment. Controlled and developed a wide temperature range of online water quality analysis instruments.
Chinese online conductivity meter is a new generation of all-Chinese microcomputer high-grade instrument, featuring full Chinese display, Chinese menu operation, full intelligence, multi-function, high measurement performance and strong environmental adaptability. The secondary meter is equipped with a constant 1.0 or 10 electrode to measure the conductivity of the general liquid; with 0.1 or 0.01 electrode, it can accurately measure the conductivity of pure water or ultrapure 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 benchtop BEC950, BEC110, BEC120, BEC307 and online BEC200A, BEC200B, BEC200D, BEC200E, BEC200F, BEC210, etc. Industry, electricity, agriculture, medicine, food, scientific research and environmental protection. The instrument is also an essential inspection equipment in the food factory, drinking water factory QS, HACCP certification.
Measuring principle of conductivity meter
The measurement principle of the conductivity meter is to put two parallel plates into the solution to be tested, add a certain potential (usually a sine wave voltage) to both ends of the plate, and then measure the flow between the plates. Current. According to Ohm's law, the conductivity (G) - the reciprocal of the resistance (R), is determined by the conductor itself.
The basic unit of conductivity is Siemens (S), originally known as ohms. Since the geometry of the conductivity cell affects the conductivity value, the standard measurement is expressed in terms of unit conductivity S/cm to compensate for differences in various electrode sizes. The unit conductivity (C) is simply the product of the measured conductivity (G) and the cell constant (L/A). Here, L is the length of the liquid column between the two plates, and A is the area of ​​the plate.
The conductivity of the aqueous solution is directly proportional to the concentration of dissolved solids, and the higher the concentration of solids, the greater the conductivity. The relationship between the conductivity and the dissolved solids concentration is approximately expressed as: 1.4 μS/cm = 1 ppm or 2 μS/cm = 1 ppm (per million units of CaCO3). The total hardness value of water can be obtained indirectly by using a conductivity meter or a total solids dissolution meter. As described above, for a convenient conversion, 1 μs/cm conductivity = 0.5 ppm hardness. Conductivity is the ability of a substance to carry a current, in contrast to the resistance value, in units of Siemens/cm (S/cm), 10-6 of the unit is expressed in μS/cm, and 10-3 is expressed in mS/cm. But need to pay attention to: (1) indirectly measure the hardness of water with conductivity, the theoretical error is about 20-30ppm. (2) The conductivity of the solution determines the movement of the molecule, and the temperature affects the movement of the molecule. In order to compare the measurement results, the test temperature is generally It is determined to be 20 ° C or 25 ° C (3) using reagent testing to obtain a more accurate water hardness value.
The conductivity of water has a certain relationship with the amount of inorganic acids, bases and salts contained therein. When their concentration is low, the conductivity increases with increasing concentration. Therefore, this index is often used to estimate the total concentration or salt content of ions in water. Different types of water have different electrical conductivities. The conductivity of fresh distilled water is 0.2-2μS/cm, but after a period of time, it increases to 2-4μS/cm due to absorption of CO2; the conductivity of ultrapure water is less than 0.10/μS/cm; the conductivity of natural water is more Between 50-500μS/cm, mineralized water can reach 500-1000μS/cm; the conductivity of industrial wastewater containing acid, alkali and salt often exceeds 10000μS/cm; the conductivity of seawater is about 30,000μS/cm.
The electrode constant is often determined using a standard potassium chloride solution of known conductivity. The conductivity (25 ° C) of different concentrations of potassium chloride solution is listed in the table below. The conductivity of the solution is related to factors such as temperature, polarization on the electrode, electrode distribution capacitance, etc. Compensation or elimination measures are generally used on the instrument.
The water sample should be measured as soon as possible after collection. If it contains coarse suspended matter, oil and fat, the interference measurement should be filtered or extracted.
1) Immerse the platinum black electrode in deionized water for a few minutes.
2) Adjust the head screw M so that the pointer points to zero.
3) Move the calibration and measurement switch K2 to the "correction" position.
4) After turning on the power switch K for a few minutes, adjust the adjustment regulator Rw3 so that the pointer is at full scale.
5) Pull the high-cycle, low-cycle switch K3 to the appropriate gear.
6) Pull the range selector switch R1 to the appropriate position.
7) Adjust the electrode constant regulator Rw2 to correspond to the constant of the electrode used (so that the electrode constant is adjusted to 1, and the conductivity of the measured solution is equal in value to the conductance of the solution).
8) After rinsing the electrode with a small amount of the solution to be tested, insert the plug into the electrode socket Kx and immerse it in the solution to be tested.
9) After adjusting the correction regulator Rw3 to the full scale, the calibration and measurement switch K2 is pulled to the measurement position. The number of indications of the hands is read, and multiplied by the multiple of the range selection switch R1, that is, the conductivity of the solution. The measurement was repeated once and the average value was taken.
10) Pull the calibration and measurement switch K2 to the "correction" position and take out the electrode.
11) After the measurement is completed, disconnect the power supply. The electrode was washed with deionized water and immersed in deionized water for use.
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