YEX-S1PRO-SAL Salinity & Temperature Sensor | YexSensor

YEX-S1PRO-SAL Online Salinity Sensor: Stable Salinity and Temperature Monitoring for Industrial Water Projects

YEX-S1PRO-SAL Online Salinity Sensor Product Introduction

YexSensor YEX-S1PRO-SAL is designed for continuous salinity and temperature measurement in water quality systems. Unlike the four-parameter YEX-S1PRO-ECT4 configuration, this page is positioned for projects that primarily require salinity 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-SAL provides continuous salinity data for water blending, aquaculture control and high-salinity process monitoring. 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

The salinity channel is calculated from the conductivity response and temperature compensation of the sensing platform. It is suitable for stable online trend monitoring and control, but it is not an ion-selective measurement and cannot distinguish sodium chloride from other dissolved ionic substances. When a contract, regulation or biological protocol specifies PSU, ppt or a particular analytical method, confirm the required unit and conversion basis before ordering.

Core Technical Highlights

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

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

• High measurement accuracy: Salinity 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-SAL 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. Aquaculture salinity control
   Monitor freshwater, brackish-water or seawater dilution and concentration so operators can protect species from rapid osmotic change. The value can support water-exchange, freshwater make-up and salt-addition decisions when limits are defined for the cultured species.

2. Estuary, river-mouth and salt-lake monitoring
   Track tidal intrusion, rainfall dilution and seasonal salinity movement. Continuous data provides better event visibility than occasional sampling and can trigger targeted laboratory sampling after abnormal change.

3. Industrial brine and high-salinity wastewater
   Follow salt loading through production, equalization and treatment stages. Use the signal for process comparison and alarm logic, while recognizing that the sensor reports total salinity behavior rather than the concentration of a specific salt.

4. Water blending and desalination pretreatment
   Verify mixing stability and detect feed-water changes before membrane or evaporation processes. The online trend can support valve sequencing and source-water selection when confirmed against the site reference method.

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

Select 0-3000 ppm for low-salinity and freshwater-transition applications, 0-10000 ppm for many brackish or moderate industrial streams, and 0-30000 ppm for higher-salinity water. Provide minimum, normal and maximum salinity, expected freshwater dilution, evaporation concentration and cleaning conditions. If full-strength seawater or concentrated brine may exceed the published range, request a written customized-range confirmation.

Installation and Data Quality Risks

Temperature, fouling, air bubbles and non-representative mixing can affect the reported salinity. Install after adequate mixing but away from undissolved salt addition, chemical dosing impact and stagnant pockets. Use a site-appropriate reference instrument or laboratory method for commissioning and periodic verification.

Information Required for a Reliable Quotation

Provide the water source and process purpose, recent laboratory results, expected minimum/normal/maximum salinity, 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 salinity 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-SAL 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 is the salinity value produced, and what are its limitations?

A1: The salinity channel is calculated from the conductivity response with temperature compensation. It is suitable for continuous trend monitoring, blending control and alarms, but it is not ion-selective and cannot distinguish sodium chloride from other dissolved ionic substances. If the project specification requires PSU, ppt, a particular salt basis or a laboratory standard, confirm the unit and conversion convention before ordering and commissioning.

Q2: Which salinity range is appropriate for freshwater, brackish water or saline process water?

A2: Use actual minimum, normal and maximum values rather than the water description alone. The 0-3000 ppm option is suited to many low-salinity and freshwater-transition points; 0-10000 ppm covers many brackish or moderate industrial streams; 0-30000 ppm is intended for higher-salinity water. Full-strength seawater or concentrated brine may exceed the published range and requires written customized-range confirmation.

Q3: Can this sensor be used for aquaculture control?

A3: Yes, it can provide continuous salinity and temperature trends for water exchange, freshwater make-up and salt-addition decisions. Alarm limits and allowable rate of change must be set for the cultured species, life stage and site operating procedure. Install after adequate mixing and use staged control or validation delays where a sudden dosing response could cause overshoot.

Q4: Why might online salinity differ from a refractometer or laboratory result?

A4: Differences can arise from unit conventions, temperature basis, conductivity-to-salinity conversion, sample composition, instrument calibration and sampling time. A refractometer and a conductivity-derived online sensor do not necessarily use the same measurement principle. During commissioning, compare both methods on the same well-mixed sample, record temperature and units, and define which method is the project reference.

Q5: Where should the salinity sensor be installed in a blending or dosing system?

A5: Choose a continuously wetted point after sufficient mixing but before the final control or discharge decision. Avoid direct contact with undissolved salt, concentrated chemical injection, large bubbles, stagnant pockets and sediment accumulation. If the system has rapid concentration changes, position the sensor far enough downstream to measure the blended water rather than the dosing plume.

Q6: How should the signal be used in PLC or SCADA control logic?

A6: Map salinity, temperature and communication status as separate tags. Use high/low process limits together with rate-of-change and communication-loss alarms so a frozen signal is not treated as acceptable water quality. For automated dilution or salt addition, include output limits, deadband and a validation time appropriate to tank volume and mixing delay, and test the complete response during commissioning.

Q7: Is RS-485 or optional 4-20mA better for a salinity project?

A7: RS-485 Modbus is preferable when both salinity and temperature must be read digitally, when several instruments share a bus, or when exact engineering values are required without analog rescaling. Optional 4-20mA suits an existing analog-only controller. The two outputs are alternative configurations; state the selected signal, full-scale range and controller input requirement in the order.

Q8: How can stable long-term salinity data be maintained?

A8: Keep the titanium electrode clean, prevent bubbles from collecting around the sensing area, inspect cable and sealing condition, and trend the value against operating events. Periodically compare the sensor with the agreed site reference at representative low and normal values. Investigate changes in water composition and reference-method differences before applying an offset or recalibrating.

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.