Technical performance

Conductivity measurement range: (0～199.9)us/cm ; (200～1999)us/cm ; (2.00～19.99)ms/cm ； (20.0～199.9)ms/cm ；
resolving power: 0.1/1us/cm ； 0.01/0.1ms/cm ；
Accuracy: Electrometer: 1.0%FS; Supporting facilities: 1.5%FS
Temperature compensation: automatic or manual compensation for 10-50 ℃,
Basic configuration: DJS-1E (platinum black) electrode; 018 temperature electrode, 1408us/cm conductivity standard calibration seat; 4 DC1.5V batteries, No.7

working conditions
Environmental temperature: 0-40 ℃ Relative humidity: ＜ 85％
Power supply: 4 DC1.5V batteries No. 7
No significant vibration
There is no strong magnetic field interference other than the geomagnetic field.
Optional electrode specification constant: 0.1, 1, 10
External dimensions and weight: 180 * 80 * 30mm (length * width * height) 0.5 kg
2、 Instrument working principle
In an electrolyte solution, charged ions move and transfer current under the action of an electric field. Its conductivity is represented by the electrical conductivity G, which is the reciprocal of the resistance. That is, G=1/R
The method for testing conductivity can be to insert an electrode composed of two metal plates into a solution to form a conductivity cell and measure the resistance between the two plates. According to Ohm's law, the resistance value is proportional to the distance L (cm) between the plates and inversely proportional to the area A (cm2) of the plates. That is, R=&rho& bull; L/A
ρ For resistivity, its reciprocal is conductivity and expressed in K, then K=1/ρ
For a certain electrode, the ratio of the effective distance L between the electrode plates to the area A of the plates is called the electrode constant of this electrode, represented by J, that is, J=L/A
According to the above formulas, we can obtain:
G=K/J means K=G * J
The unit of conductivity G is Siemens, and the unit symbol is S.
1S＝103ms＝106uS
The commonly used units for conductivity K are mS/cm and uS/cm.
The method of testing conductivity with this instrument is to apply a DC voltage generated by an oscillator to the electrode (the purpose of applying an AC voltage is to avoid polarization of the electrode), generate a current in the conductivity cell, which is proportional to the conductivity of the measured solution. After current voltage conversion, amplification, and detection, it is converted into a DC voltage, temperature compensation, etc., and finally converted into a digital signal by an A/D converter, which is displayed on a microcomputer. The entire process is controlled and processed by a microcomputer.