A conductivity sensor measures how well a solution conducts electricity, which reflects the concentration of dissolved ions. A conductivity transmitter (meter or controller) processes the sensor signal and provides a display and standard outputs. They are used for continuous monitoring of EC, TDS, resistivity and temperature in thermal power, chemical fertilizer, environmental protection, metallurgy, pharmaceuticals, food and water treatment.

The conductivity sensor measures changes in current or voltage caused by the ions in the solution. The conductivity transmitter processes the sensor signal, performs temperature compensation, and converts it into standard industrial signal outputs.

• EC (electrical conductivity): the ability of a solution to conduct electricity, usually in μS/cm or mS/cm.
• TDS (total dissolved solids): an estimate of dissolved substances, usually calculated from EC using a conversion factor.
• Resistivity (ER): the reciprocal of conductivity, usually in MΩ·cm, commonly used for ultrapure water.

Asmik conductivity analyzers can measure EC, TDS or resistivity together with temperature.

• MIK-TDS210-B: online conductivity / hardness / resistivity analyzer
• MIK-TDS210-C: online conductivity meter and EC controller
• MIK-EC8.0: online conductivity meter for EC, TDS, resistivity and temperature
• MIK-DC2000: general-purpose water quality controller for Asmik digital sensors, including pH, ORP, conductivity, dissolved oxygen, turbidity and sludge concentration

If you are unsure, send us your application details and our engineers will recommend a model.

• MIK-TDS6012, MIK-TDS7001: EC/TDS sensors for boiler water, RO water treatment, sewage treatment and pharmaceutical applications
• MIK-TDS7002: 4-electrode conductivity sensor
• MIK-TDS7003: bipolar graphite electrode for corrosive sewage and process water
• MIK-TDS8001: digital conductivity and salinity sensor with two-pole graphite electrode for aquaculture, environmental water and industrial processes
• MIK-TDS8002: digital conductivity and salinity sensor with quadrupole alloy electrode for aquaculture, river sewage and seawater salinity

A 2-electrode sensor is simple and cost-effective, and is commonly used for low to medium conductivity. A 4-electrode sensor uses separate electrodes for current and voltage, which generally reduces the effect of electrode polarization and fouling, and allows a wider measuring range, especially at higher conductivity.

Graphite has excellent electrical conductivity and corrosion resistance, so graphite electrodes are well suited to conductivity measurement in corrosive sewage and production process water. The MIK-TDS7003 and MIK-TDS8001 use graphite electrodes.

The cell constant (K) describes the geometry of the sensor. Low cell constants are generally used for low-conductivity water such as pure water, and higher cell constants for high-conductivity solutions. Please tell us your expected conductivity range so we can recommend a suitable sensor.

Yes. The MIK-TDS8001 and MIK-TDS8002 digital sensors measure both conductivity and salinity. The MIK-TDS8002 is designed for applications including seawater salinity and aquaculture.

An analog sensor must be connected to a conductivity transmitter that processes its signal. A digital sensor processes the measurement inside the sensor and communicates digitally, which reduces interference and makes it easy to connect to a controller such as the MIK-DC2000, a PLC or an IoT system.

Yes. The MIK-TDS6012, MIK-TDS7001 and MIK-TDS7002 support boiler water and RO water treatment monitoring. For low-conductivity water, please tell us the expected range so we can select a suitable cell constant.

Conductivity changes significantly with temperature. Temperature compensation converts the reading to a reference temperature, usually 25 °C, so that measurements are comparable. Asmik conductivity transmitters support temperature compensation.

A conductivity sensor is generally calibrated with a standard solution of known conductivity close to the process range, or by entering the cell constant. Please follow the calibration procedure of your transmitter.

Keep the electrode surfaces clean, since deposits, oils and biofilm affect the reading. Clean the sensor regularly according to the type of contamination, and check the reading against a standard solution after cleaning.

The MIK-TDS210-B is designed as a conductivity / hardness / resistivity online analyzer. Please tell us your water type and required hardness range so we can confirm suitability.

Asmik conductivity transmitters support standard signal outputs for easy system integration and remote monitoring. Available outputs depend on the model; please check the product page or tell us your requirements.

Typical industries include thermal power, chemical fertilizer, environmental protection, metallurgy, pharmaceuticals, food, water treatment and aquaculture.

To help us select the correct model, please provide:

• Application and medium (e.g., pure water, boiler water, sewage, seawater)
• Expected conductivity range and parameter (EC, TDS, resistivity, salinity)
• Temperature and pressure
• Corrosive components or fouling conditions
• Installation method (immersion, flow-through or pipe insertion)
• Analog or digital sensor, and cable length
• Transmitter outputs and power supply
• Quantity

Send your requirements to info@asmik.com or contact us via WhatsApp at +86 13325716921.