The conductivity meter is an essential instrument for measuring the conductivity of aqueous solutions in industrial production and experiments. It is widely used in scientific research and production in various fields. Structure of conductivity meter 1. Electrode constant adjustment button: constant adjustment for different electrodes 2. Temperature knob: temperature compensation for the measured solution 3. Range switch button: calibration / range selection switch, sub-calibration, 20μs, 200μs, 2000μs, 20ms 4. Calibration adjustment knob: calibration range full scale 5. Rear panel structure Principle of conductivity meter 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 concentration. Therefore, this indicator is often used to speculate the total amount of ions in water. Concentration or salt content. Conductance (G) is the reciprocal of resistance (R). Therefore, when two electrodes (usually platinum electrodes or platinum black electrodes) are inserted into the solution, the resistance R between the two electrodes can be measured. According to Ohm's law, when the temperature is constant, this resistance value is proportional to the electrode spacing L (cm) and inversely proportional to the electrode cross-sectional area A (cm2), namely: R = Ï Ã— (L / A) where Ï is the resistivity, which is 1cm long and the resistance of a conductor with a cross-sectional area of ​​1cm2, the size of which depends on the nature of the material. According to the above formula, the conductance (G) of the conductor can be expressed as follows: G = 1 / R = (1 / Ï) × (A / L) = K × (1 / J) where K = 1 / Ï is called conductivity and J = L / A is called cell constant The conductivity of the electrolyte solution refers to the conductivity of two parallel electrodes 1 cm3 apart when filled with 1 cm3 of solution. It can be seen from the above formula that when the electrode constant (J) is known and the resistance (R) or conductance (G) of the solution is measured, the conductivity can be obtained. Use of conductivity meter Since the conductivity is in most cases proportional to the concentration of ions in the solution, it is easy to determine the total dissolved solid concentration in the solution and the salinity of the solution by measuring the conductivity. Common applications are: boiler blowdown, desalination, reverse osmosis, salinity measurement, water / wastewater treatment. Precautions for the use of conductivity meter 1. The container holding the solution to be tested must be clean and free from ion contamination. 2. High-purity water should be measured quickly after being filled into the container, otherwise the conductivity will decrease rapidly because the dissolved in the air becomes carbonate ions. 3. The lead of the electrode must not be wet, otherwise the measurement will be inaccurate. It adopts electric cutting way, will be in A3, A4 typesetting good name card paper, placed in the machine entrance, set the crop size, press the switch, the machine will automatically be sent to a name card paper inside the machine, the machine according to the internal knife group of different sizes, can be cut into postcards, name card name card, card and personal card. The chekanovskogo machine has the advantages of high accuracy, cutting speed, long service time etc.. Card Slitting Machine,Card Perforating Machine,Card Creasing Machine,Manual Card Die Cutter Anhui Innovo Bochen Machinery Manufacturing Co., Ltd. , https://www.innovomachines.com