Daruifuno Launches the DPH790 Digital pH Sensor with RS485 Modbus Output and IP68 Body

Suzhou Delfino Environmental Technology Co., Ltd. (Daruifuno) has introduced the DPH790 digital pH sensor, a compact, fully digital electrode that outputs temperature-compensated pH values over RS485 Modbus and is built to survive continuous immersion.

Based on the classic glass electrode measuring principle, the DPH790 is designed for reliable, stable performance in online water quality monitoring and industrial process control. Unlike traditional analog probes that need a separate transmitter, it delivers digital data directly to PLCs, controllers and SCADA systems, simplifying wiring and improving accuracy.

Key Measurement Capabilities

• Measuring range: 0.00~14.00 pH and 0.0~50.0 °C
• Accuracy: 0.1% FS or ±0.02 pH, whichever is greater
• Automatic temperature compensation built into the sensor
• Calibration: zero and slope calibration at 4.01, 6.86 and 9.18 pH

Digital Communication and Safety

The sensor communicates using RS485 with the standard Modbus RTU protocol, acting as a slave on the network. Power and communication are electrically isolated inside the sensor, which reduces electrical noise and improves stability in demanding plants. The pH value is available at register address 2 and temperature at address 4, both as 32-bit floating point values.

Built for the Field

Why This Sensor Stands Out

1. Direct RS485 Modbus output — no separate transmitter required
2. Internal electrical isolation for low-noise, stable signals
3. Automatic temperature compensation across 0~50 °C
4. IP68 PPS body for immersion and humid environments
5. 1″ NPT mounting and a low 0.2 W power draw

Reading Data Over Modbus

With a default slave address of 9, the sensor answers standard read commands and can be addressed, calibrated or reset over the bus, making commissioning and replacement straightforward. Power is supplied over a wide 9~24 VDC range drawing only about 0.2 W, so the sensor can share supplies with other field devices.

About Daruifuno

Suzhou Delfino Environmental Technology Co., Ltd. designs and manufactures water analysis instruments and sensors, supplying online, portable and laboratory products to customers worldwide since 2015.

Common applications include environmental water treatment, drinking water and purified water systems, circulating water, electroplating, electronics, chemical, food and pharmaceutical processes. Contact Daruifuno today for samples, pricing and Modbus protocol documentation.