JW-PH(Z24) pH Water Quality Sensor is designed for continuous pH and temperature monitoring in water, wastewater, irrigation systems, hydroponic nutrient solutions, soil-related media and industrial process water. With IP68 protection, RS485 Modbus RTU or SDI-12 output, low power consumption and a compact 3/4 NPT threaded body, it is suitable for long-term field monitoring and remote data acquisition systems.
2. Product Overview
The pH Water Quality Sensor is a compact digital pH probe for continuous water quality monitoring. It integrates a pH electrode and signal transmitter circuit into one IP68 protected housing, helping system integrators simplify installation, reduce wiring complexity and improve measurement stability.
The sensor supports RS485 Modbus RTU and SDI-12 communication options. It can be connected to industrial controllers, environmental data loggers, smart agriculture gateways, IoT monitoring platforms and remote water quality systems. Its compact cylindrical structure and 3/4 NPT thread make it suitable for water tanks, pipelines, irrigation systems, wastewater channels, hydroponic systems and field monitoring stations.
Parameter
Model No.
JW-PH(Z24)
Measured Parameters
pH and Temperature
pH Range
0 to 14 pH
pH Resolution
0.01 pH
pH Accuracy
±0.1 pH
pH Response Time
<10 seconds
Temperature Range
-40 to 80°C
Temperature Resolution
0.01°C
Temperature Accuracy
±0.5°C
Measuring Medium
Solution or semi-solid medium
Output Option
RS485 Modbus RTU or SDI-12 V1.3
Power Supply
4.5 to 28V DC
SDI-12 Power Consumption
Static current <10 μA at 12V DC, measuring current <10 mA at 12V DC
RS485 Power Consumption
Static current <5 mA at 12V DC, measuring current <10 mA at 12V DC
Protection Rating
IP68
Working Environment
0 to 80°C, 0 to 100% RH
Pressure
≤0.2 MPa
Storage Environment
-5 to 65°C, 0 to 90% RH
Cable Length
2 m standard, customizable
Dimensions
207 × 30 mm
Thread
3/4 NPT
Installation Method
Immersion, pipeline or tank installation
3. Dimension
4. Output Options and Communication
RS485 Modbus RTU Output
The RS485 version is suitable for industrial automation, PLC systems, smart agriculture controllers, IoT gateways and multi-point monitoring projects. The default communication setting is 9600 bps, 8 data bits, no parity and 1 stop bit.
SDI-12 Output
The SDI-12 version is suitable for hydrological, meteorological, agricultural and environmental monitoring stations. It is ideal for low-power field data acquisition systems and battery-powered monitoring stations.
5. Application Scenarios
Water quality pH monitoring
Wastewater treatment plants
Industrial process water monitoring
Agricultural irrigation water control
Greenhouse nutrient solution monitoring
Hydroponic and soilless cultivation systems
Environmental monitoring stations
Laboratory water testing
Food and pharmaceutical process water
Chemical and power plant water treatment
Soil and semi-solid media monitoring
Smart agriculture and IoT water quality systems
6.Installation Description
The sensor is designed with a compact cylindrical housing and 3/4 NPT threaded structure. It can be installed by immersion, mounted into a pipeline fitting or fixed on a tank wall. For accurate pH measurement, the electrode end should be fully immersed in the tested liquid or semi-solid medium.
Vertical installation is recommended. Tilted installation may affect reference electrolyte diffusion and reduce measurement accuracy. New or long-unused electrodes should be soaked in 3M KCl solution before use.
7.Maintenance Notes
The pH electrode service life is typically 1 to 2 years. In frequent-use or harsh environments, the replacement cycle may need to be shortened. Long-term measurement in solutions with pH below 2 or above 12 may accelerate electrode aging, and temperatures above 80°C may damage the glass membrane.
For general applications, monthly calibration with standard pH buffer solutions is recommended. For high-accuracy applications, daily calibration may be required. After measuring protein, sulfide or organic solvent samples, the electrode should be rinsed immediately with deionized water.
FAQ
Q
1. What does this pH sensor measure?
A
It measures pH and temperature. The pH range is 0 to 14, and the temperature range is -40 to 80°C.
Q
2. What is this pH water quality sensor used for?
A
It is used for continuous pH monitoring in water, wastewater, irrigation water, hydroponic nutrient solutions, industrial process water and semi-solid media.
Q
3. Does this pH sensor support RS485 output?
A
Yes. The sensor can be supplied with RS485 Modbus RTU output for connection to PLCs, data loggers, IoT gateways and monitoring platforms.
Q
4. Does this pH sensor support SDI-12 output?
A
Yes. SDI-12 output is available for environmental monitoring stations, hydrological systems and low-power field data acquisition applications.
Q
5. Is this pH probe waterproof?
A
Yes. The sensor has an IP68 protection rating and is suitable for immersion monitoring when installed correctly.
Q
6. Can JW-IoT provide this pH sensor for smart irrigation projects?
A
Yes. JW-IoT can supply this pH sensor for irrigation water monitoring, greenhouse irrigation control and smart agriculture water quality systems.
Q
7. Can JW-IoT integrate this pH sensor with a cloud platform?
A
Yes. JW-IoT can integrate the sensor with RS485 or SDI-12 data loggers, LoRaWAN gateways, 4G gateways and cloud monitoring platforms according to project requirements.
Q
8. Can JW-IoT customize the cable length or communication output?
A
Yes. JW-IoT can provide the standard 2 m cable or customized cable length. RS485 Modbus RTU and SDI-12 output options are available.
Q
9. How should the pH sensor be installed?
A
The electrode end should be fully immersed in the tested liquid or semi-solid medium. Vertical installation is recommended for stable measurement performance.
Q
10. How often should the pH sensor be calibrated?
A
For general applications, monthly calibration is recommended. For high-accuracy applications, daily calibration may be required.
Q
11. What is the typical service life of the pH electrode?
A
The typical service life is 1 to 2 years. Frequent use or harsh environments may shorten the replacement cycle.
Q
12. Can the sensor be used in battery-powered field stations?
A
Yes. The sensor has low power consumption and can be used in battery-powered monitoring systems, especially with SDI-12 data loggers.
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