EasySyS ES-PH485 Digital pH Transmitter (RS485)

EasySyS ES-PH485 Integrated Digital pH Transmitter

The ES-PH485 is an all-in-one sensor that houses an industrial-grade pH glass electrode, a temperature sensor and a smart signal transmitter inside a single sealed body. The measurement is digitised right at the probe and delivered over RS485 Modbus RTU, so there is no separate analyser, no analog drift over long cables and no extra wiring.

Its double salt bridge Ag/AgCl reference system resists poisoning by heavy metals, sulphides and other contaminants, while a protective guard and fouling-resistant junction keep the sensing glass clean in dirty, oily or loaded media. The gel electrolyte is maintenance-free and never needs refilling.

Rated IP68 and threaded ¾" at both ends, the sensor can be installed by immersion, in a pipeline tee, in a flow-through cell, through a tank side-wall, top-mounted or in an open channel. Multiple sensors share one RS485 bus, each with its own Modbus address, feeding PLCs, RTUs, loggers, HMIs, SCADA and IoT gateways.

Key features

• Measures pH and temperature over 0.00 – 14.00 pH with 0.01 pH resolution and ±0.1 pH accuracy
• Integrated transmitter — digital signal generated at the measuring point for noise-free readings
• RS485 Modbus RTU output, baud rate 2400 / 4800 / 9600 / 19200 bps, address 1 – 247
• Automatic temperature compensation by built-in sensor, or manual value set via Modbus
• Double salt bridge (double junction) Ag/AgCl reference for longer, more stable life
• Maintenance-free gel electrolyte and corrosion-resistant engineering-plastic body
• IP68 fully submersible, process pressure ≤ 0.2 MPa, operating 0 – 60 °C
• Field multi-point calibration with standard buffers (4.00 / 6.86 / 9.18) over Modbus
• Supplied with 5 m 4-core shielded cable, protective cap and manual including register map