Mettler Toledo InPro 3253/120/PT1000 Pre-Pressurized Liquid-Filled pH Sensor with PT1000 Temperature Compensation

The Mettler Toledo InPro 3253/120/PT1000 is a high-performance pre-pressurized, liquid-filled pH sensor designed for reliable, real-time pH measurements in demanding bioprocessing environments. Featuring a 120 mm shaft length, this sensor is optimized for installations with limited insertion depth. Its integrated PT1000 temperature sensor enables precise temperature compensation essential for accurate pH monitoring under varying thermal conditions.

The sensor's pre-pressurized reference system uses a liquid electrolyte with a ceramic diaphragm complemented by an Argenthal silver-ion trap cartridge—enhancing durability and performance in sulfide-rich and harsh chemical environments. This pH electrode withstands pressures up to 4 bar gauge and operates effectively across a temperature range of 0 °C to 100 °C.

Designed for steam sterilization/autoclaving, the robust sensor maintains long-term accuracy through repeated sterilization cycles, making it critical in biotechnology and biopharmaceutical production pipelines—notably in fermenters and bioreactors requiring stringent aseptic conditions. Its hygienic design and compatibility with CIP/SIP processes further suit it for food and beverage processing as well as water and wastewater treatment applications.

Technical features include a Pg 13.5 process connection thread and a “VP” type connector for secure system integration. This sensor is widely used in molecular diagnostics, synthetic biology research, and biomanufacturing, where precise pH control is vital for optimizing growth conditions and product yield.

Key Specifications:

This pH sensor is essential for bioprocess monitoring, live-cell fermentation control, and critical pH measurement in biopharmaceutical and biotechnology workflows that demand robust, maintenance-minimal instrumentation.