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RS485 Modbus RTU Digital pH Sensor with IP68 Rating and Automatic Temperature Compensation for Online Water Quality Monitoring

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RS485 Modbus RTU Digital pH Sensor with IP68 Rating and Automatic Temperature Compensation for Online Water Quality Monitoring

Product Model : DPH790

Shell Size : Phi 35 mm, total length 220 mm

Model Number : DPH790

Resolution : pH 0.01 pH; Temp 0.1 C

Communication : RS485, Modbus RTU

Shell Material : PPS

Delivery Time : 3 working days for stock, 10-20 days for bulk production

Power Supply : 12 VDC, about 0.2 W

Brand Name : Daruifuno

Place of Origin : Suzhou, China

Price : USD100-200 / Piece

Working Temperature : 0-50 C

Temperature Compensation : Automatic

Flow Rate : 0.001-0.5 m/s

Electrical Isolation : Power and communication isolated

Certification : CE, ISO 9001

Supply Ability : 5000 Pieces per Month

Measuring Range : 0.00-14.00 pH; 0.0-50.0 C

Cable : Standard 5 m, customizable

Payment Terms : T/T

Weight : About 200 g

Measuring Principle : Glass electrode method

MOQ : 1 Piece

Product Name : Digital pH Sensor

Installation : 1 inch NPT thread at both ends

Packaging Details : Daruifuno branded color box

Accuracy : 0.1% FS or +/-0.02 pH (larger)

Protection Grade : IP68

Calibration : Zero & slope; 4.01 / 6.86 / 9.18 pH

Working Pressure : <=4 Bar

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Product Overview

The DPH790 digital pH sensor is a compact, fully digital electrode that adopts the classic glass electrode measuring principle for reliable, stable performance. Instead of a fragile analog signal, it outputs temperature-compensated pH values directly over RS485 Modbus, making it ideal for online monitoring and industrial control systems.

With a measuring range of 0.00~14.00 pH and 0.0~50.0 ℃, the sensor provides automatic temperature compensation and accuracy of 0.1% FS or ±0.02 pH (whichever is greater). Power and communication are electrically isolated inside the sensor, reducing noise and improving stability in electrically noisy plants. Calibration is performed with standard solutions using zero and slope calibration, with three calibration points at 4.01, 6.86 and 9.18 pH, the calibration point can be changed freely in daruifuno's controller.

Housed in a rugged PPS body with IP68 protection, the DPH790 tolerates immersion, dust and humidity, and its 1″ NPT threads at both ends simplify mounting into pipes, tanks and flow cells. Communication follows standard Modbus RTU, so the electrode integrates directly with PLCs, controllers and SCADA systems.

Technical Parameters
Parameter Specification
Product Model DPH790
Measuring Principle Glass electrode method
Measuring Range 0.00~14.00 pH; 0.0~50.0 ℃
Resolution pH 0.01 pH; Temp. 0.1 ℃
Accuracy 0.1% FS or ±0.02 pH (take the larger)
Temperature Compensation Automatic
Calibration Zero & slope, points 4.01 / 6.86 / 9.18 pH
Communication RS485, Modbus RTU
Working Temperature 0~50 ℃
Working Pressure ≤4 Bar
Flow Rate 0.001~0.5 m/s
Protection Grade IP68
Power Supply 12VDC, about 0.2 W
Shell Material / Size PPS; φ35 mm, total length 220 mm
Installation 1″ NPT thread at both ends
Weight / Cable About 200 g; standard 5 m cable (customizable)
Key Advantages
  1. Direct digital output: RS485 Modbus RTU sends temperature-compensated pH values straight to controllers. PLC, DTU or SCADA.
  2. Electrical isolation: power and communication are isolated inside the sensor for low noise and high stability.
  3. Automatic temperature compensation: built-in compensation keeps readings accurate from 0 to 50 ℃.
  4. High accuracy: 0.1% FS or ±0.02 pH (whichever is greater) on a 0.00~14.00 pH range.
  5. Rugged IP68 construction: PPS body rated for immersion, dust and humidity.
  6. Simple installation: 1″ NPT threads at both ends suit pipes, tanks and flow cells; low 0.2 W power draw.
  7. Full Modbus control: read measurements, change the slave address, calibrate and reset via standard function codes.
Applications
  • Environmental protection and wastewater treatment
  • Drinking water treatment and surface water monitoring
  • Purified water and circulating water systems
  • Electroplating, electronics and printing & dyeing
  • Chemical, food and pharmaceutical processes
  • Pollution source monitoring and industrial process control
Frequently Asked Questions
Q1: What communication does the DPH790 use?

It uses RS485 with the standard Modbus RTU protocol.

Q2: How do I read pH and temperature?

Use function code 04 to read the pH register (address 2) and the temperature register (address 4), both as 32-bit floating point values.

Q3: Does it compensate for temperature automatically?

Yes, temperature compensation is automatic across the 0~50 ℃ working range.

Q4: How is it calibrated?

It uses zero and slope calibration with standard solutions at 4.01, 6.86 and 9.18 pH; calibration commands are sent over Modbus.

Q5: What is the protection grade?

IP68, with a PPS body suitable for immersion and humid environments.

Contact Daruifuno today for samples, pricing and Modbus protocol documentation for the DPH790 digital pH sensor.


Product Tags:

Digital RS485 Modbus pH Sensor

      

Glass Electrode 0-14pH

      

IP68 Water Quality Probe

      
Quality RS485 Modbus RTU Digital pH Sensor with IP68 Rating and Automatic Temperature Compensation for Online Water Quality Monitoring for sale

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