EIT LiQlyzer EC Conductivity Meter
Methods For Choosing A Conductivity Meter
Liquid conductivity
The quantity of free ions, also known as charged particles, affects electrical conductance. The conductivity increases with the presence of free ions in the solution. A high conductive solution is, for instance, water with table salt dissolved in it. Na and Cl atoms will entirely separate from the table salt (NaCl) particles, creating a highly ionised solution with a reasonably high conductivity.
Working Principle
Ohm's law is necessary for conducting conductivity measurements. In its most basic configuration, two plates (electrodes) are positioned on the solution with a predetermined alternating potential between them, and the voltage generated is measured using sensors embedded in the sample.
Types of conductivity sensor
2 Pole Cells
Alternating current is applied between the poles of two parallel electrodes in the most conventional type of cell. The resulting voltage is measured and the conductivity is computed using sensors. The electrodes' resistance, on the other hand, interferes with calculations due to the polarisation effect, which can occasionally reduce reading accuracy.
4 Pole Cells
This type of cell consists of 4 electrodes. Two inner cells (2 and 3) and two outer cells (1 and 4), the two inner electrodes are not polarized. An alternating current is applied between the outer cells, and a constant potential difference is applied between the inner cells with a negligible current. Thus, the conductivity would be directly proportional to the applied current. The 4 pole cell’s purpose is to minimize the beaker field effect, leading to more accurate readings.
Inductive Conductivity
The driving and receive coils are two metallic coils submerged in a plastic body. The drive coil receives an alternating current, which creates a voltage in the solution surrounding the coil. The conductivity of the solution is shown by the current that the receive coil receives. This model is excellent for fluids with high conductivities and is extremely helpful in fluids with high suspended material concentrations.
Common applications for conductivity include:
| Ultra-pure water (0-1000 µS/cm) | General water (0-30 mS/cm) | Concentration application (0-2000 mS/cm) |
| Power Plant Biopharmaceutical Semiconductor Food and Beverage | Cooling water Wastewater | Acids CIP |
 LQEC-T30AC |
 LQEC-T40AC |
 LQEC-T60AC |
| Range: 0.01-20uS/cm ; 0.1-200uS/cm ; 1-2000uS/cm ; 1-20mS/cm ; 1-2000mS/cm | ||
| Communication: 4-20mA RS485 ModbusRTU | ||
| Working Condition: 0-60°C | ||
| Power Supply: 240VAC | ||
| Installation: Panel/ Wall mounted/ Pipeline | ||
| Model | LQEC-T30AC/T40AC | LQEC-T60AC |
| Accuracy | ±3%FS | ±1%FS |
| Relay control contacts | 3A 250VAC, 3A 30VDC | 5A 240VAC, 5A 28VDC, 120VAC |
| Protection | IP54 | IP65 |
| Dimension | 96*96*135(mm) | 144*144*107(mm) |
| Hole Size | 92.5*92.5(mm) | 138*138(mm) |
| Other Functions | - | Data record &Curve display |
EIT Conductivity Sensor
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| Model | SEC3733 | SEC3732 | SEC3743 | SEC3742 | SEC3952 | SEC3701 | SEC3742 | SEC3501 | SEC3790 |
| Cell constant | K=0.01 | K=0.4 | K=1.0 | ||||||
| Housing Material | SS316L | Graphite | PFA | ||||||
| Measuring Range | 0.1-20us/cm | 0.1-200us/cm | 0.1-20us/cm | 0.1-1000us/cm | 0.1-1000us/cm | 0.1-30,000us/cm | 0.1-500,000us/cm | 0.1-30,000us/cm | 0-2,000mS/cm |
| Accuracy | ±1%F.S | ||||||||
| Pressure Range | ≤0.8Mpa | ≤1.6Mpa | |||||||
| Temperature Compensation | NTC 10K, PT1000 PT1000 | ||||||||
| Temperature Range | 0-45℃, 0-80℃, 0-130℃ | -20-130℃ | |||||||
| Installation Thread | NPT3/4” | PG13.5 | NPT3/4” | PG13.5 | NPT3/4” | ||||
| Application | Pure, Boiler Feed water, Power Plant, Condensate Water | General purpose | Chemical manufacturing | ||||||
| Cable Length | Standard 10m cable, can be extended | ||||||||