Name: pH Sensor InPro3251/120/PT100
Brand: Mettler Toledo

Accurate at Cold Process Temperatures

The InPro 3251 120/PT100 provides stable and precise readings at temperatures down to -25⁰ C, thanks to its low temperature pH glass membrane.

Low Maintenance and Easy-to-Use

This pH sensor is designed for low maintenance pH measurements, from dirty industrial to hygienic and sterile environments.

Sterilizable and Autoclavable

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

Reliable, Accurate and Robust

The InPro 3251 120/PT100 is designed to withstand the rigors of your production. Its pre-pressurized, maintenance-free reference system ensures high reproducibility and reliable measurement performance under diverse operating conditions.

Easy Validation

The InPro 3251 120/PT100 is suited for chemical and biopharmaceutical production. Its certification covers hazardous zone use, biocompatibility of the electrolyte, and all relevant hygiene and safety regulations.

Versatile to Meet Your Application Needs

This sensor can measure pH in industrial processes and has a built-in PT100 temperature sensor. It is pressure resistant up to 4 barg (58 psig), has a watertight connector, and can withstand repeated sterilization and autoclave cycles.

Specifications - pH Sensor InPro3251/120/PT100

ISM (Digital) or Analog	Analog
pH Sensing Technology	Glass Membrane Suitable For Low Temperatures (LoT)
pH Range	1 – 11
Reference System	Pre-pressurized liquid electrolyte, ceramic diaphragm, Argenthal cartridge with silver-ion trap
Operating Temperature (Fahrenheit)	-13 °F - 176 °F
Operating Temperature (Celsius)	-25 °C - 80 °C
Cable Connector	VP
Process Connection	Pg 13.5 Thread
Sterilizable/Autoclavable	Yes
Sensor Length	120 mm
Certificates & Approvals	ATEX/IECEx: Ex ia IIC T6/T5/T4/T3 Ga/Gb CE EHEDG FM: IS Cl. I, II, III, Div 1, GR ABCDEFG/T6 METTLER TOLEDO Quality Certificate PED
Operating Pressure (Bar)	0 to 4 barg
Model Family	InPro3250(i)
Temperature Sensor	Pt 100
Measurement Parameter	pH
Shaft Material	Glass
Operating Pressure (PSI)	0 to 58 psig
Refillable Electrolyte	No
Hazardous Area Approvals	Yes
Primary Media/Application	Chemical Processes Pharmaceutical/Life Science Production
Hygienic/Biocompatibility Approvals	Yes

Buffers for In-Line pH Sensors

Technical Buffer pH 2.00 6x250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This package contains six bottles of 250mL of pH 2.00 buffer solution.

Material No.: 51319010

Technical Buffer pH 2.00 1000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 1000 mL of pH 2.00 buffer solution.

Material No.: 51319011

Technical Buffer pH 4.01 6x250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This package contains six bottles of 250mL of pH 4.01 buffer solution.

Material No.: 51340058

Technical Buffer pH 4.01 1000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 1000 mL of pH 4.01 buffer solution.

Material No.: 51340228

Technical Buffer pH 7.00 6x250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This package contains six bottles of 250mL of pH 7.00 buffer solution.

Material No.: 51340060

Technical Buffer pH 7.00 1000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 1000 mL of pH 7.00 buffer solution.

Material No.: 51340229

Technical Buffer pH 9.21 6x250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This package contains six bottles of 250mL of pH 9.21 buffer solution.

Material No.: 51300194

Technical Buffer pH 9.21 1000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 1000 mL of pH 9.21 buffer solution.

Material No.: 51340230

Technical Buffer pH 10.00 6x250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This package contains six bottles of 250mL of pH 10.00 buffer solution.

Material No.: 51340231

Technical Buffer pH 10.00 1000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 1000 mL of pH 10.00 buffer solution.

Material No.: 51340232

Buffer pH 4.01 ACS red 5000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single container holds 5000 mL of pH 4.01 buffer solution.

Material No.: 51319012

Buffer pH 7.00 ACS green 5000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single container holds 5000 mL of pH 7.00 buffer solution.

Material No.: 51319016

Buffer pH 9.21 ACS blue 5000ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single container holds 5000 mL of pH 9.21 buffer solution.

Material No.: 51319017

Technical Buffer pH 2.00 250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 250 mL of pH 2.00 buffer solution.

Material No.: 51340055

Technical Buffer pH 4.01 250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 250 mL of pH 4.01 buffer solution.

Material No.: 51340057

Technical Buffer pH 7.00 250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 250 mL of pH 7.00 buffer solution.

Material No.: 51340059

Technical Buffer pH 9.21 250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 250 mL of pH 9.21 buffer solution.

Material No.: 51300193

Technical Buffer pH 10.00 250ml

Certified and traceable pH buffer solution for sensor calibration and verification in life science and industrial applications. This single bottle contains 250 mL of pH 10.00 buffer solution.

Material No.: 51340056

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