Online Conductivity Sensor Easy to install submerged installation Ip68

1.Application Environment

Drinking water/surface water/various water supplies/industrial water treatment

2.Feature

• Signal Output: RS-485(Modbus/RTU protocol)
• Convenient to connect to PLC, DCS, Industrial Control Computer, General Controller, paperless recording instrument or touch screen and other third-party equipment.
• Easy to install: submerged installation.
• Ip68, containment level.

3.Technical Specifications

4.Dimensional Drawing

6.Tips:Total Dissolved Solids (TDS)

Devices for measuring electrical conductivity are often used to measure total dissolved solids (TDS). It is a measure of the total weight of all organic and inorganic substances contained in a liquid in various forms: ionized, molecular (dissolved), colloidal and suspended (not dissolved). Dissolved solids refer to any inorganic salts, mostly calcium, potassium, magnesium, sodium, chlorides, bicarbonates and sulfates, and some organic matter dissolved in water. The solid substances contained in a liquid, which is considered for TDS, must be either dissolved or in the form of very small particles that will remain the solution after filtration through a filter with very small pores (2 micrometers or less). Substances that are permanently suspended in a solution, but cannot pass through a filter are called total suspended solids or TSS. Total dissolved solids are usually measured in water to determine its quality.

There are two main methods of measuring total dissolved solids: gravimetric analysis, which is the most accurate method, and conductivity measurement. The first method is the most accurate, but it is time-consuming because all water must be evaporated, to dryness, usually at 180°C under strict laboratory conditions and then the mass of residues is measured.

The second method is not as accurate as the gravimetric analysis. However, the conductivity method is the most convenient, useful, widespread, and fastest method because it is a simple measurement of conductivity and temperature, which can be done in seconds using a low-cost device. This method can be used because the electrical conductivity of water is directly related to the concentration of ionized substances dissolved in water. It is especially useful for quality control purposes like control of drinking water or estimation of the total number of ions in a solution.

The conductivity measurements are temperature dependent, that is, if the temperature increases, the conductivity also increases because the ions in a solution are moving faster. To obtain temperature-independent measurements, the concept of reference temperature was introduced. It allows a comparison of conductivity results obtained at different temperatures. Thus, the conductivity meter can measure the actual conductivity and the temperature and then use a temperature correction function to automatically convert the measured value to the reference temperature of 20 or 25°С. If very high accuracy is necessary, the sample can be put into a thermostat, and then the meter will be calibrated at the same temperature that is used for measurement.

Most modern conductivity meters contain a built-in temperature sensor that can be used for temperature correction as well as for temperature measurement. The most sophisticated meters can measure and display conductivity, resistivity, salinity, TDS, and concentration. However, all of them measure only conductivity and temperature and then calculate the necessary physical value and make temperature compensation.