IP68 Salinity Probe for Aquaculture Water Quality Monitoring

Key Features

0 to 70.0 PSU salinity range for seawater, high-salinity water, and process water monitoring
0.1 PSU resolution for stable online salinity measurement
RS485 Modbus RTU output for easy integration with PLC, DCS, industrial PCs, recorders, and IoT gateways
Automatic temperature compensation with Pt1000 sensor for more reliable readings
IP68 waterproof design suitable for long-term immersion applications
3/4 NPT threaded installation for tanks, pipelines, reservoirs, and submersible mounting
Fast response time under 30 seconds for real-time water quality monitoring
12 to 24V DC power supply with low power consumption of 0.2W at 12V
Two-point calibration supports zero and slope calibration for field maintenance
ABS and POM housing for corrosion-resistant use in water treatment and saline environments

Product Description

Stable salinity control is one of the key factors for successful aquaculture operations.

JW-DDM-206(K14) salinity probe is designed for continuous salinity monitoring in shrimp farms, fish farms, marine aquaculture systems and water treatment applications.

The sensor measures salt concentration changes in water and provides reliable data for smart aquaculture management. Combined with IoT data loggers, RS485 Modbus communication and cloud monitoring platforms, it enables real-time remote water quality monitoring.

The salinity sensor is suitable for:

Shrimp pond monitoring
Fish farming
Recirculating aquaculture systems (RAS)
Coastal aquaculture
Water quality monitoring projects

For system integrators and distributors, JW-IoT provides flexible configurations, communication options and OEM solutions.

Technical Specification

Item	Specification
Product Type	Online Salinity Sensor
Measurement Principle	Electrode method
Salinity Range	0 to 70.0 PSU
Resolution	0.1 PSU
Accuracy	±1.5% of reading
Temperature Compensation	Automatic temperature compensation with Pt1000
Response Time	T90 less than 30 seconds
Minimum Detection Limit	0.1 PSU
Calibration Method	Two-point calibration
Output Signal	RS485 Modbus RTU
Working Temperature	0 to 50°C
Working Pressure	Less than 0.6 MPa
Storage Temperature	-5 to 65°C
Power Supply	12 to 24V DC
Power Consumption	0.2W at 12V
Protection Grade	IP68
Housing Material	ABS and POM
Installation Method	Immersion installation with 3/4 NPT thread
Cable Length	5 m standard cable customizable

Why Salinity Monitoring Is Important in Aquaculture

Maintaining Stable Salinity for Shrimp and Fish Health

Salinity directly affects the growth, metabolism and survival rate of aquatic organisms.

In shrimp farming and marine aquaculture, salinity levels may change because of:

Heavy rainfall
Water evaporation
Freshwater inflow
Water exchange
Seasonal climate variation

Sudden salinity fluctuations can create stress for shrimp and fish, reducing feeding efficiency and increasing disease risks.

A continuous aquaculture salinity sensor helps operators understand real-time water conditions and make faster management decisions.

Compared with manual sampling methods, online salinity monitoring provides:

✔ Continuous measurement
✔ Historical data recording
✔ Remote access
✔ Early abnormal condition detection
✔ Reduced manual inspection workload

Working Principle of Aquaculture Salinity Sensor

How Does a Salinity Probe Work?

A salinity sensor measures the electrical conductivity of water.

When salt dissolves in water, ions such as:

Sodium (Na⁺)
Chloride (Cl⁻)
Potassium (K⁺)
Calcium (Ca²⁺)

increase the water’s ability to conduct electricity.

The sensing element detects conductivity changes and converts them into salinity values.

The measurement process:

Salt ions in water

↓

Electrical conductivity measurement

↓

Signal processing

↓

Salinity value output

↓

Monitoring platform display

Aquaculture Salinity Monitoring System Architecture

A complete smart aquaculture monitoring system normally includes:

Salinity Probe

↓

Data Logger / RTU

↓

4G / LoRaWAN Communication

↓

Cloud Monitoring Platform

↓

Mobile Phone / PC Dashboard

Operators can remotely:

View current salinity values
Check historical trends
Set alarm thresholds
Analyze water quality changes

Applications

Shrimp Farm Salinity Monitoring

Shrimp farming requires accurate salinity management because shrimp are sensitive to environmental changes.

JW-IoT salinity probe can be used in:

Outdoor shrimp ponds
Intensive shrimp farming systems
Biofloc systems
Large commercial aquaculture farms

Fish Farm Water Quality Monitoring

Different fish species require different salinity conditions.

Continuous monitoring supports:

Marine fish farming
Brackish water aquaculture
Recirculating aquaculture systems

Coastal Aquaculture Monitoring

Coastal farms are affected by:

Tidal changes
Rainfall
Seawater exchange

Remote salinity monitoring helps operators understand environmental changes without frequent manual sampling.

Complete Multi-Parameter Aquaculture Monitoring Solution

Salinity is only one important water quality parameter.

A professional aquaculture monitoring system may combine:

Dissolved Oxygen Monitoring

Dissolved oxygen is critical for fish and shrimp survival.

pH Monitoring

pH variation affects aquatic biological processes.

Conductivity Monitoring

Conductivity provides additional information about dissolved substances in water.

RS485 Salinity Sensor Integration

RS485 Modbus Communication for Industrial Monitoring

For professional aquaculture projects, RS485 Modbus is commonly used because of:

Long transmission distance
Stable communication
Easy PLC integration
Compatibility with industrial controllers

A typical RS485 salinity monitoring system includes:

Salinity Sensor

↓

RS485 Modbus

↓

Controller / PLC

↓

SCADA or Cloud Platform

Salinity Probe Selection Guide

When selecting a salinity sensor for aquaculture projects, consider:

1. Application Environment

Different environments require different installation methods.

Consider:

Freshwater
Brackish water
Marine water
Industrial wastewater

2. Communication Method

Communication	Recommended Application
RS485 Modbus	Local industrial systems
4-20mA	Traditional control systems
4G LTE	Remote farms
LoRaWAN	Large monitoring networks

3. Integration Requirements

Large projects may require integration with:

IoT platforms
Farm management software
Automatic aeration systems
Alarm systems

FAQ

Q

1. What is an online salinity sensor used for?

A

An online salinity sensor is used to continuously measure the salt concentration of water in seawater monitoring, aquaculture, desalination, industrial water treatment, and high-salinity wastewater applications.
Q

2. What salinity range does this sensor support?

A

This sensor measures salinity from 0 to 70.0 PSU with a resolution of 0.1 PSU, making it suitable for seawater and high-salinity water monitoring.
Q

3. Can the sensor connect to a PLC or IoT platform?

A

Yes. The sensor provides RS485 Modbus RTU output, which allows connection to PLCs, DCS systems, RTUs, data loggers, and IoT monitoring platforms.
Q

4. Is this salinity sensor suitable for long-term immersion?

A

Yes. The sensor has an IP68 waterproof rating and supports immersion installation for tanks, pipelines, reservoirs, and water treatment systems.
Q

5. How does JW-IoT support salinity monitoring projects?

A

JW-IoT can integrate salinity sensors with IoT gateways, cloud dashboards, alarms, and data management systems for smart water, aquaculture, and industrial monitoring projects.
Q

6. Does the sensor include temperature compensation?

A

Yes. The sensor uses automatic temperature compensation with a Pt1000 element to improve measurement stability under changing water temperature conditions.
Q

7. Can JW-IoT provide this sensor for aquaculture applications?

A

Yes. JW-IoT can provide the salinity sensor as part of a complete aquaculture water quality monitoring solution, including dissolved oxygen, pH, temperature, conductivity, and salinity monitoring.
Q

8. What installation method does the sensor use?

A

The sensor supports immersion installation and uses a 3/4 NPT threaded structure, making it suitable for submersible, pipeline, tank, and flow-cell installation.
Q

9. Can JW-IoT customize cable length or system integration?

A

Yes. JW-IoT can support customized cable length, gateway connection, Modbus data integration, and platform-based monitoring according to project requirements.