Pyxis ST-712 Inline pH + ORP Sensor

The ST-712 an inline dual-channel pH + ORP sensor that is specifically designed to simplify installation, calibration and operation in process, industrial, waste and cooling water applications. This sensor offers an embedded transmitter and can be utilized in both 4–20mA or RS-485 Modbus formats. When used in RS-485 format, the ST-712 also provides a temperature output signal. These features dramatically improve application possibilities allowing the ST-712 to be directly connected to most OEM controller, PLC or DCS systems.

The ST-712 has an oversized platinum disk for ORP and a flat pH bubble sensing element that increases resistance to highly turbid waters and contamination. The enlarged salt bridge design with large junction capacity also ensures a long sensor life with minimal maintenance. This device is ideally suited for “hard-to-measure” waters where conventional pH & ORP sensors would otherwise fail or require high maintenance costs. The ST-712 does NOT require electrode change-out or Potassium Chloride (KCl) re-fill, and is designed to be used until the end of life and then completely swapped out.

Typical Applications

• Industrial Process & Cooling Water
• Fresh, Brackish, Sea Water
• Raw, Influent Water
• Wastewater Effluent
• Surface & Storm Water

Features

• Dual Embedded Transmitter – 4–20mA and RS-485 supporting Modbus
• Compact Design for Small Footprint, Ideally Suited for Industrial Applications
• Tolerant to Frozen Conditions during Shipment or Storage
• Large Junction Capacity (Compared to Replaceable Electrode Design) Leading to Longer Service Life and Less Maintenance
• Stainless Solution Grounding Point on Sensor to Stay Away from Ground Loop Problems
• Interfaces with Pyxis Lab® MA-WB Wireless Adapter or PowerPACK Auxiliary Box

Specifications

Downloads

ST-71X Data Sheet

Water Quality Sensor (pH, ORP, Conductivity) Start-Up Guide