Emerson Rosemount 3081PH Conductivity Transmitter

The Emerson Rosemount 3081PH Conductivity Transmitter is a two‑wire, loop‑powered transmitter that converts conductivity readings from Rosemount Analytical conductivity sensors into a standard 4–20 mA signal for process control. It is powered from a DC loop supply in the 12 to 42.4 V range, with 42.4 VDC cited as the maximum in vendor literature. As part of the Rosemount 3081 conductivity transmitter family, the device provides a reliable, inline signal path for conductivity measurement in liquids and interfaces with Rosemount Analytical conductivity sensors to deliver a current output compatible with DCS/PLC inputs. Common applications include monitoring ionic content and impurities in process streams, such as water and wastewater treatment, chemical processing, and other liquid‑processing industries where conductivity informs quality and concentration. The 3081PH transmitter sits within Emerson’s Rosemount Liquid Analysis lineup, designed to integrate with other Rosemount sensors for pH/ORP, dissolved oxygen, and related measurements to support comprehensive inline liquid analysis across plants.