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Products Description
Conductivity sensor selection and commissioning checks
Specify the expected conductivity range and unit before selecting a variant. Confirm whether the controller needs uncompensated conductivity, temperature-compensated conductivity or a derived TDS value. A TDS conversion factor depends on the water composition; report the configured factor instead of treating TDS and conductivity as identical measurements.
| Check | Project detail to confirm |
|---|---|
| Water and range | Low, normal and high conductivity, temperature and fouling conditions |
| Installation | Representative water contact, bubbles, cable route and cleaning access |
| PLC integration | Power, Modbus settings, register map, engineering unit and fault handling |
| Acceptance | Suitable conductivity standard, temperature basis and independent verification |
Compare installation and verification in the conductivity calibration guide and RS485 Modbus integration FAQ.
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:
ionic-load trending and shock-load detection at plant inlets.
Drinking water networks:blend control and anomaly alarms in distribution monitoring.
IR Fertigation and hydroponics:nutrient-solution concentration verification.
Boiler and cooling circuits:blowdown control support and leak detection.
Technical Specifications
| Product model | YEX-S1-EC (Modbus version) |
| Measuring range | 0–5000 µS/cm (TDS 0–3000 mg/L) |
| Measuring principle | Two-electrode conductive measurement with automatic temperature compensation |
| Output | RS-485 (Modbus RTU protocol) |
| Power supply | 12–24 V DC |
| Protection grade | IP68 |
| Installation | Immersion installation, NPT 3/4 thread |
| Standard cable | 5 m four-core shielded cable (customizable) |
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.
