pH Sensor InPro3100/120/PT100

Gel-Filled Electrode for pH. The InPro 3100 is a pH electrode with a temperature sensor, designed for measurement in bioprocesses where CIP and SIP procedures are required. The 120 mm version is optimal for short installation lengths.

Rugged pH Sensor for Bioprocesses

The InPro 3100 offers stable measurement without risk of diaphragm clogging due to the patented Argenthal silver-ion trap reference system.

Gel Electrolyte Reduces Maintenance

This is a gel-filled electrode that provides effective, accurate pH measurement with low maintenance requirements.

Sterilizable and Autoclavable

This sensor provides fast and precise pH measurement even after repeated autoclaving and sterilization cycles.



Specifications – pH Sensor InPro3100/120/PT100

ISM (Digital) or Analog Analog
pH Sensing Technology Highly Alkali Resistant Glass Membrane for Tough Conditions (HA)
pH Range 0 – 14
Reference System Gel electrolyte, ceramic diaphragm, Argenthal cartridge with silver-ion trap
Operating Temperature (Fahrenheit) 32 °F – 284 °F
Operating Temperature (Celsius) 0 °C – 140 °C
Cable Connector VP
Process Connection Pg 13.5 Thread
Sterilizable/Autoclavable Yes
Sensor Length 120 mm
Certificates & Approvals CE; METTLER TOLEDO Quality Certificate; FM: IS Cl. I, II, III, Div 1, GR ABCDEFG / T6; EHEDG; ATEX/IECEx: Ex ia IIC T6 / T5 / T4 / T3 Ga / Gb; PED
Operating Pressure (Bar) 0 to 6 barg @ 140 °C
Model Family InPro3100(i)
Temperature Sensor Pt 100
Measurement Parameter pH
Shaft Material Glass
Operating Pressure (PSI) 0 to 87 psig @ 284 °F
Refillable Electroyte No
Hazardous Area Approvals Yes
Primary Media/Application Pharmaceutical/Life Science Production
Hygienic/Biocompatibility Approvals Yes
Material Number(s) 52000656


Reliable, Accurate and Robust

The InPro 3100 120/PT100 is designed to withstand the rigors of bioprocessing. It uses a gel-filled electrolyte, which requires less maintenance, and the silver-ion trap helps keep the junction clear, even in the presence of sulfide-bearing solutions.

Reliable Where Cleaning Is Needed

The InPro 3100 120/PT100 is designed for in-line pH measurements where sensor cleaning and sterilization is required. The sensor can withstand in situ SIP and CIP processes while maintaining fast and precise measurements.

Versatile to Meet Your Application Needs

This sensor can measure both pH in challenging applications, and has a built in Pt100 temperature sensor. It is pressure resistant up to 6 bar (87 psig) and has a watertight connector.


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pH Sensor InPro3100/120/PT100 62faead391b53

pH Sensor InPro3100/120/PT100 62faead391b6a