Conductivity (G) is the reciprocal of resistance (R), and conductivity (K) is the reciprocal of resistivity (ρ). Therefore, when an electrode (usually a platinum electrode or a platinum black electrode) is inserted into a solution, there are two parallel plates (or cylindrical electrodes) with a fixed distance L inside the electrode, and 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 distance L (cm) between the two electrodes and inversely proportional to the cross-sectional area A (cm?) of the electrodes, that is, R=ρ× (L/A); Where ρ is the resistivity, with a length of 1cm and a cross-sectional area of 1cm? The resistance of a conductor is determined by the nature of matter. According to the above formula, the conductivity (G) of a conductor can be expressed as follows: G=1/R=(1/ρ) × (A/L)=K × (1/J); Among them, K=1/ρ is called conductivity, J=L/A is called electrode constant; The conductivity of electrolyte solution refers to a 1cm gap between two parallel electrodes that are 1cm apart? The electrical conductivity of a solution. So when the electrode constant (J) is known and the solution resistance (R) or conductivity (G) is measured, the conductivity can be calculated.
1. Menu structure, easy to operate, displayed in both Chinese and English;
2. Multi parameter display on the same screen;
3. Can measure conductivity, control upper and lower limits, and output standard current;
4. Automatic temperature compensation function.
model | YK-DDG-3080 |
Conductivity measurement range | 0.01~20 μ S/cm (with K=0.01 electrode) 0.1-200 μ S/cm (with K=0.1 electrode) 1.0~2000 μ S/cm (with K=1.0 electrode) 10-20000 μ S/cm (with K=10.0 electrode) 30-600 mS/cm (with K=30.0 electrode) |
Basic error of electronic unit | Conductivity: ± 0.5% FS, Temperature: ± 0.3 ℃ |
Automatic temperature compensation range | 0-199.9 ℃, with 25 ℃ as the reference temperature |
Tested water sample (including water vapor) | 0-110 ℃, maximum 120 ℃, 0.6MPa |
Basic instrument error | Conductivity: ± 1.0% FS, Temperature: ± 0.5 ℃ |
Automatic temperature compensation error of electronic unit | ±0.5%FS |
Repetitive error of electronic unit | ± 0.2% FS ± 1 word |
Stability of electronic units | ± 0.2% FS ± 1 word/24h |
Current isolation output | 0-10mA (load<1.5k Ω) 4-20 mA (load<750 Ω) |
Output current error | ≤±1%FS |
Error caused by the influence of environmental temperature on electronic units | ≤±0.5%FS |
Error caused by the influence of electronic unit power supply voltage | ≤±0.3%FS |
Alarm relay | AC220V，3A |
communication interface | RS485 or 232 (optional) |
Power Supply | AC220V±22V，50Hz±1Hz |
Waterproof and dustproof design | Protection level IP54, cast aluminum shell suitable for outdoor use |
Clock accuracy | ± 1 minute/month |
Data storage capacity | 1 month (1 hour/5 minutes) |
Continuous power-off storage time of data | 10 years |
External dimensions | 146 (length) * 146 (width) * 150 (depth) mm |
Hole size | 138*138 mm |
Working conditions | Environmental temperature 0-60 ℃, relative humidity<85% |
Weight | 1.5kg |
Applicable fields | Industries such as thermal power, chemical, metallurgical, environmental protection, pharmaceuticals, biochemistry, food, and tap water. |
