RS485 Modbus Conductivity Sensor | YEX-S1-EC

This RS485 Modbus variant of the YEX-S1-EC industrial conductivity sensor is configured for PLC and SCADA monitoring with a 0–5000 µS/cm measuring range (TDS 0–3000 mg/L) — the working span of most municipal, industrial and agricultural water. It streams conductivity, TDS and temperature from a submersible IP68 probe over RS-485 Modbus RTU.

Where It Fits in the YexSensor Line

The YexSensor online water quality family is organized in three tiers: the S1 standard series (cost-effective probes in an IP68 engineering-plastic housing for high-volume monitoring points), the S1 PRO stainless-steel series (316L stainless-steel housings for seawater, high-chloride and oily duty), and the S2 flagship series (dual-interface RS485 + 4–20 mA connectivity for OEM and mixed analog/digital projects). If your duty is conventional municipal, industrial or agricultural water at scale, the S1 series is the economical choice; specify S1 PRO when corrosion resistance and higher accuracy are required.

Core Technical Highlights

• Range tuned to real-world water: 0–5000 µS/cm covers potable, surface, irrigation and most wastewater without wasting resolution.

• Three values from one probe: conductivity, TDS and temperature on one Modbus register map.

• Digital RS-485 Modbus RTU: built for PLC, SCADA and datalogger integration with register-level diagnostics.

• IP68 submersible body: NPT 3/4 thread for tanks, pipes and flow cells.

• 12–24 V DC: solar-station friendly.

Application Scenarios

Wastewater and effluent:

1. ionic-load trending and shock-load detection at plant inlets.

Drinking water networks:

2. blend control and anomaly alarms in distribution monitoring.

IR Fertigation and hydroponics:

3. nutrient-solution concentration verification.

Boiler and cooling circuits:

4. blowdown control support and leak detection.

Technical Specifications

Contact our engineering team for the full datasheet and register map before ordering.

Frequently Asked Questions

How is this variant different from the four-range YEX-S1-EC?

This Modbus version is factory-configured to the 0–5000 µS/cm span — the most common municipal and industrial window — simplifying selection for standard projects. The four-range variant covers ultrapure and high-salinity extremes.

Is TDS the same as conductivity?

No. TDS is derived from conductivity through a composition-dependent factor (commonly ~0.5–0.7). The probe outputs both; verify the factor against your local lab method for reporting use.

What information should I provide for a quotation?

Provide the water matrix, expected conductivity span, installation method, cable distance, power supply and Modbus integration requirements, plus quantity and destination country.

What quality assurance is provided?

Every unit passes a standardized inspection process and a 72-hour high-temperature aging test before shipment, and is backed by a one-year warranty from the date of sale. Standard delivery includes the sensor, a 5 m four-core shielded cable, an instruction manual and a certificate of conformity.

Planning a conductivity/TDS monitoring project? Send us your water matrix, range and control-system interface — our engineers will return a configuration proposal, Modbus register map and quotation within one business day.