Substrate Moisture Sensor with Analog Voltage Output

1. Description

JW-S1S(Z6) Substrate Moisture Sensor is designed for accurate volumetric water content monitoring in soil and growing media. With analog voltage output, IP68 waterproof sealing, fast response time, low salinity sensitivity, and compact probe design, it is ideal for greenhouse irrigation, nursery trays, potted plants, soilless cultivation, plant research, and precision agriculture applications.

2. Product Overview

The Substrate Moisture Sensor is a compact analog sensor used to monitor the dynamic change of water content in soil and soilless growing media. By measuring the dielectric constant of the medium, the sensor can reflect the actual volumetric water content of the substrate and provide reliable data for irrigation management, plant growth research, and precision agriculture.

The sensor is especially suitable for greenhouses, potted plants, nursery trays, plant cultivation, substrate moisture monitoring, water-saving irrigation, and scientific experiments. Its small probe structure allows easy installation in limited root zone spaces, while the IP68 epoxy-sealed body supports long-term buried use.

With voltage output and fast measurement response, the sensor can be integrated with compatible data loggers, irrigation controllers, environmental monitoring terminals, and custom analog acquisition systems.

3. Dimension

4. Output Options and Communication

The sensor uses analog voltage output, making it suitable for data loggers or acquisition systems that support excitation voltage and single-ended voltage input.

Analog Voltage Output

The sensor outputs voltage according to the dielectric constant of the surrounding medium. The output range is typically between 10% and 50% of the excitation voltage. Any data logger that can provide 2.5–15.0 VDC excitation voltage for about 10 ms and has a 12-bit or higher voltage input can be used with the sensor.

For battery-powered monitoring systems, pulse excitation is recommended. This allows the sensor to remain powered off most of the time, reducing battery consumption and supporting long-term field deployment.

Compatible Acquisition Systems

The sensor can be connected to:

• Analog input data loggers
• Greenhouse monitoring terminals
• Irrigation controllers
• Custom analog acquisition boards
• Environmental monitoring stations
• Plant research data collection systems
• Low-power IoT monitoring devices

Signal Conversion for Different Media

The sensor provides conversion methods for different growing media, including:

• Mineral soil
• Potting soil
• Rockwool
• Other customized substrates
• Dielectric constant calculation

For special substrates such as volcanic rock, high-titanium soil, or media with high dry dielectric constant, custom calibration is recommended to improve accuracy.

5. Application Scenarios

Greenhouse Irrigation Monitoring

The sensor can be installed in greenhouse soil beds or growing substrates to monitor moisture changes in the root zone. It helps growers understand when to irrigate and how much water is needed, reducing overwatering and improving crop consistency.

Typical uses include:

• Greenhouse vegetable irrigation
• Tomato and cucumber substrate monitoring
• Leafy vegetable cultivation
• Flower and ornamental plant growing
• Smart greenhouse water management

Potted Plants and Nursery Trays

Thanks to its compact probe design, the sensor is suitable for small containers, nursery trays, seedling media, and potted plants. It can help monitor substrate moisture in limited spaces where larger probes may be difficult to install.

Typical uses include:

• Seedling tray moisture monitoring
• Potted plant irrigation control
• Nursery production management
• Plug tray water content monitoring
• Plant cultivation experiments

Soilless Cultivation and Substrate Monitoring

The sensor can be used in different growing media such as potting soil, rockwool, peat, coco coir, perlite mixtures, and other porous substrates. For special media, custom calibration is recommended to improve measurement accuracy.

Typical uses include:

• Rockwool water content monitoring
• Coco coir substrate irrigation
• Potting soil moisture monitoring
• Hydroponic growing media monitoring
• Substrate water balance analysis

Water Saving Irrigation

The sensor provides real-time substrate moisture data to support precise irrigation decisions. When connected to a data logger or controller, it can help reduce unnecessary irrigation and improve water use efficiency.

Typical uses include:

• Drip irrigation management
• Precision irrigation scheduling
• Water-saving agriculture
• Soil moisture threshold monitoring
• Irrigation research and optimization

Scientific Research and Precision Agriculture

The sensor is suitable for agricultural research, plant physiology studies, soil water movement experiments, and controlled environment agriculture. It provides reliable moisture data for researchers studying plant water demand and substrate water dynamics.

Typical uses include:

• Plant growth experiments
• Soil and substrate moisture research
• Root zone water dynamics
• Precision agriculture monitoring
• Controlled environment agriculture trials

6.Installation and Measurement

The sensor should be inserted into soil or substrate until the probes are fully covered. Good contact between the probe and the surrounding medium is essential for accurate measurement.

Recommended installation steps:

1. Remove stones or hard particles from the installation area.
2. If the soil is very hard, pre-drill a hole or water the soil before installation.
3. Insert the sensor into the soil or substrate carefully.
4. Make sure the probes are fully inserted.
5. Compact the surrounding medium gently after installation.
6. Avoid air gaps around the probes.
7. Connect the sensor to a compatible voltage input data logger.
8. Select the correct conversion formula for the target medium.