Name: pH Sensor InPro3251i/SG/120
Brand: Mettler Toledo

Accurate at Cold Process Temperatures

The InPro 3251i SG/120 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 digital pH sensor has Intelligent Sensor Management (ISM) technology, offering predictive diagnostics to reduce maintenance and calibration.

Sterilizable and Autoclavable

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

Reliable, Accurate and Robust

The InPro 3251i SG/120 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.

Advanced Sensor Diagnostics with ISM

This pH sensor features a digital signal and intelligent diagnostics to help manage your maintenance. The sensor provides a clear display of its remaining lifetime, time remaining until calibration, and counts of the SIP and CIP cycles it has undergone.

Easy Validation

The InPro 3251i SG/120 is suited for chemical and pharmaceutical 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 both pH and ORP (Redox), and has a built-in digital 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 InPro3251i/SG/120

ISM (Digital) or Analog	ISM (Digital)
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	K8S
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	Digital
Measurement Parameter	pH
Shaft Material	Glass
Operating Pressure (PSI)	0 to 58 psig
Solution Ground/Redox Metal	Platinum
Refillable Electrolyte	No
Hazardous Area Approvals	Yes
Primary Media/Application	Chemical Processes Pharmaceutical/Life Science Production
Hygienic/Biocompatibility Approvals	Yes

Material No.: 52300383

( incl. VAT)

Computer Accessory iLink Multi

Material No.: 30130631

( incl. VAT)

Sensor Simulation & Validation

ISM Simulator pH Kit

Simulating ISM sensors

Material No.: 52300410

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

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

( incl. VAT)

Search suggestions