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pH Sensor

Liquid Level Sensor

Product Description

A pH meter measures the hydrogen-ion activity in water-based solutions, indicating its acidity or basicity expressed as pH. (Wikipedia: pH Meter). pH level is an important indicator in many scenarios, especially in monitoring soil conditions and water quality. A pH sensor is widely used in farming, gardening, hydroponics, aquaponics, swimming pool and spas, sewage treatment, education, environmental monitoring, and many other applications.

This pH sensor (S-pH-01A) is designed with industry standards. It adopts international advanced solid dielectric and large-area polytetrafluoroethylene liquid junction, which is not easy to block and convenient for maintenance. It's designed with ATC (automatic temperature compensation), making sure the data is accurate regardless of the temperature changes. This pH Sensor is IP65 rated, waterproof in a tight seal, capable of withstanding long-term constant use in professional application scenarios.

This pH Sensor comes with a MODBUS-RTU RS485 serial communications protocol or 4~20mA current output. It can be easily connected to and integrated with other devices such as data-loggers, controllers, and displays, etc. This cost-effective pH sensor features low-power consumption, compact size, portability, high integration, making it widely applicable in both indoor and outdoor environments.


  • High performance: high accuracy, fast response, good repeatability
  • Universal protocol: MODBUS RS-485 or 4~20mA current
  • Wide-range power supply: 3.6V ~ 30V
  • Robustness: suitable to be immersed in soil or water for a long time
  • Maintainance-Free: advanced junction design, no clogging
  • Durable: anti-corrosion, automatic temperature compensation
  • User-friendly: Easy to install and integrate


  • Agriculture: greenhouse, aquaponics, hydroponics, and crop Plantation, etc.
  • Animal Husbandry: pasture, grassland, and meadow
  • Forestry and Horticulture
  • Sewage Treatment
  • Swimming Pools and Spas
  • Scientific Experiments
  • Educational Projects
  • Other environmental monitoring scenarios


Range0 ~ 14pH
Accuracy± 0.1 pH
Resolution0.01 pH
General Parameters
Product ModelS-pH-01A
ProtocolMODBUS-RTU RS485
Current Output4 ~ 20 mA
Power Supply3.6 ~ 30VDC
Current ConsumptionMax 6mA @24V DC
Operating Temperature-40℃ ~ 85℃
IP RatingIP65
Cable Length5 meters
InstallationAll buried or probe into the media to be measured
Device Weight400g



Electric Wiring



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