YEX-S1PRO-EC Conductivity & Temperature Sensor | YexSensor

YEX-S1PRO-EC Online Conductivity Sensor: Stable Conductivity and Temperature Monitoring for Industrial Water Projects

YEX-S1PRO-EC Online Conductivity Sensor Product Introduction

YexSensor YEX-S1PRO-EC is designed for continuous conductivity and temperature measurement in water quality systems. Unlike the four-parameter YEX-S1PRO-ECT4 configuration, this page is positioned for projects that primarily require conductivity plus the temperature channel used for compensation and process evaluation.

The sensor uses a high-stability titanium electrode, 316L stainless steel + ABS housing and IP68 protection. Three selectable range levels support different clean-water, process-water, wastewater and environmental applications, while customized ranges can be confirmed for OEM and engineering projects.

Standard RS-485 Modbus RTU communication supports PLC, RTU, data logger, SCADA and IoT gateway integration. Optional 4-20mA output can be selected for analog control systems. RS-485 and 4-20mA are alternative configurations and should be confirmed when ordering.

S1 PRO Positioning and Engineering Advantages

YEX-S1PRO-EC provides direct conductivity data for ionic-strength trend monitoring, dosing decisions and process alarms. Temperature is included as a standard measured channel in the sensor and reaches +/-0.1 C accuracy, supporting automatic compensation and allowing the control system to read the process temperature independently.

The titanium electrode, 10-second response, 316L stainless steel structure and digital communication make the sensor suitable for integrators who need stable online data, compact installation and clear Modbus mapping. The NPT 3/4 thread supports immersion, pipe and tank mounting without changing the sensing principle.

How to Interpret the Measurement

Conductivity is the direct electrical measurement of the water's ability to carry current. A rising value normally indicates an increase in dissolved ions, but it cannot determine whether the change comes from chloride, sulfate, hardness, acid, alkali or another ionic source. Engineering alarms should therefore be based on a site baseline and confirmed by parameter-specific analysis when compliance or root-cause identification is required.

Core Technical Highlights

• Dedicated Conductivity positioning: The product page and selection data focus on conductivity, while temperature remains included for compensation and monitoring.

• Three selectable ranges: 0-3000 / 0-10000 / 0-30000 uS/cm, customizable.

• High measurement accuracy: Conductivity accuracy reaches +/-1.5%, with temperature accuracy of +/-0.1 C and 10-second response.

• Titanium electrode: The high-stability titanium sensing element supports reliable long-term online measurement.

• 316L stainless steel + ABS: The compact IP68 housing supports demanding immersion and industrial field installations.

• RS-485 / optional 4-20mA: Select Modbus RTU for digital systems or optional 4-20mA for analog systems.

• Automatic temperature compensation: Integrated temperature data helps reduce the influence of water-temperature variation on the primary reading.

Application Scenarios and System Integration

YEX-S1PRO-EC can be connected to PLC, SCADA, RTU, telemetry and water-quality IoT systems. The value of the sensor is not simply continuous display; it is the ability to connect a measured change to an operating decision, alarm, sampling action or control response.

1. Industrial process-water control
   Track ionic concentration changes caused by dosing, rinsing, raw-material carryover or production switching. The EC trend can be used for alarm thresholds, rinse-end determination and abnormal-water diversion.

2. Cooling and boiler-water supervision
   Follow concentration cycles, make-up water variation and blowdown effectiveness. EC is a practical control variable for preventing excessive salt accumulation, but project limits must be set from the actual treatment program.

3. Wastewater process and discharge monitoring
   Detect sudden increases in dissolved ionic load from chemical, electroplating, textile or mixed industrial influent. Continuous EC data helps trigger sampling and source investigation; it does not identify the specific contaminant.

4. Surface water and groundwater stations
   Identify changes in the overall ionic character of rivers, reservoirs and groundwater. Use the trend together with pH, temperature and laboratory ion analysis when the source of a change must be confirmed.

For project selection, provide the expected minimum, normal and maximum value, water type, temperature, pressure, installation method, cable length and required output. This helps match the correct range without sacrificing useful resolution.

Range Selection, Data Quality and Procurement Boundaries

Range Selection

Choose the narrowest range that still covers normal operation, start-up, cleaning and credible upset conditions. A 0-3000 uS/cm range is suitable for many clean-water and moderate process-water points; 0-10000 or 0-30000 uS/cm should be considered for concentrated process streams, high-mineral water or wastewater. Do not select the widest range by default if low-level variation is operationally important.

Installation and Data Quality Risks

Electrode deposits, bubbles, incomplete immersion and rapidly changing temperature can create apparent drift. Install where flow is representative, avoid dead zones and direct chemical injection points, and clean the titanium electrode with a soft brush. Automatic temperature compensation improves comparability, but the project should still define the reference temperature and alarm basis.

Information Required for a Reliable Quotation

Provide the water source and process purpose, recent laboratory results, expected minimum/normal/maximum conductivity, temperature and pressure, pH, major dissolved chemicals, cleaning agents, installation drawing, flow condition, cable length, controller model, required output, Modbus settings, quantity and destination. State whether the reading will be used for display, alarm, automatic control, reporting or treatment-performance calculation.

PLC, SCADA and Alarm Strategy

Map the primary conductivity value and temperature as separate engineering tags. Configure communication-loss, out-of-range and rate-of-change alarms independently from the process high/low limits, because a frozen or missing signal should not be interpreted as normal water quality. Use a short validation delay or moving average only where process dynamics allow it; excessive filtering can hide a genuine step change. Store the raw reading, compensated reading basis, device address, range configuration and maintenance status in the commissioning record so future troubleshooting does not depend on undocumented controller scaling.

Commissioning and Acceptance

Before acceptance, verify wiring polarity, device address, baud rate, register order, engineering unit and decimal scaling. Compare the stabilized online reading with a suitable reference at low, normal and high points within the selected range, then document the water temperature and reference method. Confirm that PLC alarms, historical trends and any control interlocks respond correctly to a simulated value change or approved process test. Acceptance should cover the complete measurement loop from sensor to HMI, not only the probe output.

YEX-S1PRO-EC Technical Specifications

Installation Guidance and Electrical Connection

Installation Position

Install the sensor by immersion or through the NPT 3/4 thread in a pipe or tank. Keep at least one-third of the probe immersed and avoid upside-down or horizontal installation. Maintain an inclination greater than 15 degrees where required, and avoid severe bubbles, deposits or direct impact on the electrode.

Electrical Wiring

Connection reference: pin 1/red is power positive, pin 2/black is power negative, pin 3/green is RS485-B, pin 4/yellow is RS485-A, and pin 5 is optional 4-20mA output. Wire colors may vary by batch; use connector markings or pin numbers as the final reference.

Maintenance and Calibration

Keep the titanium electrode, terminals and aviation connector clean. Use a soft-bristled brush to remove deposits without scratching the sensing surface. Inspect cable seals and verify the reading against a suitable reference when site conditions change.

The sensor is factory calibrated. Recalibrate only when necessary. Zero-point and slope calibration are performed through the communication protocol using air or purified water and a known conductivity-based reference solution. Follow the protocol supplied with the delivered batch.

Frequently Asked Questions

Q1: How should conductivity data be interpreted in an industrial water system?

A1: Conductivity indicates the water's overall ability to carry electrical current and is therefore a practical indicator of changes in dissolved ionic load. It can reveal concentration, dilution, chemical carryover or source-water changes, but it cannot identify which ion caused the change. For compliance decisions or root-cause analysis, use the online trend to trigger targeted laboratory testing for chloride, sulfate, hardness or other relevant constituents.

Q2: Which conductivity range should be selected?

A2: Select the narrowest range that covers the verified minimum, normal maximum and credible upset value. The 0-3000 uS/cm option suits many clean-water and moderate process-water points; 0-10000 or 0-30000 uS/cm is more appropriate for mineralized water, concentrated process streams or wastewater. Include start-up, cleaning and chemical-dosing conditions in the selection, because choosing the widest range by default can reduce the usefulness of small process changes.

Q3: How does temperature compensation affect the conductivity reading?

A3: Ion mobility changes with temperature, so two samples with the same composition can show different uncompensated conductivity values. The integrated temperature channel supports automatic compensation and is also available as an independent process value. During commissioning, document the reference-temperature convention used by the project so PLC limits, handheld checks and laboratory reports are compared on the same basis.

Q4: Can the sensor determine TDS or a specific salt concentration from conductivity?

A4: Conductivity can be correlated with TDS or salt concentration when the water composition is reasonably stable, but the conversion factor is application-dependent. This EC model is intended to report conductivity and temperature. Use YEX-S1PRO-TDS, YEX-S1PRO-SAL or the four-parameter YEX-S1PRO-ECT4 when those calculated channels are required, and still validate the relationship against the project reference method.

Q5: Where should the sensor be installed for a representative measurement?

A5: Install it where the water is well mixed and representative of the control point, with the sensing area continuously immersed. Avoid dead zones, large bubbles, sediment beds, direct chemical-injection impact and positions immediately downstream of an incompletely mixed dosing point. Use the NPT 3/4 connection for immersion, pipe or tank mounting and avoid upside-down or horizontal orientation.

Q6: How should RS-485 Modbus be integrated with a PLC or SCADA system?

A6: Confirm 12-24 VDC power, A/B polarity, device address, baud rate, register order, engineering unit and decimal scaling before loop testing. Create separate tags for conductivity, temperature and communication status. Configure communication-loss and out-of-range alarms independently from process high/low alarms, then verify the complete loop by comparing the probe value, PLC register and HMI display at a stable test point.

Q7: When should optional 4-20mA be chosen instead of RS-485?

A7: Choose RS-485 Modbus when multiple digital values, diagnostics or multidrop networking are needed. Choose the optional 4-20mA configuration when the existing controller accepts only analog input or when a conventional point-to-point loop is preferred. They are alternative order configurations, so specify the required output and corresponding full-scale range before production.

Q8: What maintenance and verification routine is recommended?

A8: Inspect the electrode for coating, bubbles and mechanical damage, clean deposits with a soft brush, and check cable seals and connector condition. Compare the stabilized online value with a suitable reference after commissioning, process changes or cleaning. Do not recalibrate simply because two instruments differ; first confirm temperature basis, range, reference solution, mixing and fouling, then calibrate only when persistent drift is demonstrated.

Quality Assurance and After-sales Service

YexSensor is committed to providing a reliable product experience.

Strict quality inspection: Each product goes through a standardized inspection process and a 72-hour aging test to help ensure a defect rate below 2%.

One-year warranty: A one-year after-sales warranty is provided from the date of sale, excluding man-made damage or improper use.

Standard cable configuration: The standard configuration includes a 5 m four-core shielded cable. Other accessories are confirmed according to the order and packing list.