What does 'pre-pressurised' mean for a pH sensor?

A pre-pressurised sensor has an internal electrolyte that is kept at a higher pressure than the process medium. This helps prevent process media from entering the reference system, extending sensor life and improving stability, especially under fluctuating process pressures.

Is this sensor suitable for sterilisation processes?

Yes, this model is specifically designed to be sterilizable/autoclavable and is optimised for steam sterilisation or autoclaving cycles, making it suitable for hygienic and sterile applications.

What is the purpose of the built-in PT1000 temperature sensor?

The integrated PT1000 temperature sensor provides real-time temperature data to the connected analyser. This allows for automatic temperature compensation of the pH measurement, ensuring accuracy as pH values are temperature-dependent.

What kind of connector does this sensor use?

This sensor typically uses a 'VP' type connector, which is a common quick-connect system for industrial pH and conductivity sensors, ensuring reliable and easy connection to transmitters or analysers.

Can this sensor be used in environments with sulfides?

Yes, the inclusion of an Argenthal cartridge with a silver-ion trap is specifically designed to improve performance and prevent poisoning of the reference system in environments containing sulfides or other reference-poisoning agents.

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Mettler Toledo - InPro (Un Boxed) 3253/120/PT1000 Pre‑pressurized, Liquid‑filled, Low‑maintenance PH Sensor

Name: InPro (Un Boxed) 3253/120/PT1000 Pre‑pressurized, Liquid‑filled, Low‑maintenance PH Sensor
Brand: Mettler Toledo
SKU: P104.3146A
Price: 160 GBP
Availability: InStock

Price: £ 160

These Items are unused and boxed in original Packaging.

Supplier Catalogue No.

The Mettler Toledo InPro 3253/120/PT1000 is a high‑performance in‑line pH sensor / electrode with some specific featuresA pre‑pressurized, liquid‑filled, low‑maintenance pH sensor.

It has a built‑in PT1000 temperature sensor for temperature compensation.

The sensor length (shaft) is 120 mm, which is relatively short, making it suitable for installations with limited insertion depth.

It is sterilizable/autoclavable and optimized for steam sterilization or autoclaving cycles. That means it can withstand repeated sterilization without losing performance.

Reference system: pre‑pressurized liquid electrolyte, with a ceramic diaphragm, and includes an Argenthal cartridge with a silver‑ion trap (for better performance in environments with sulfides etc.)

It can handle pressures up to 4 bar gauge and works in the range 0 °C to 100 °C.

It has process connection thread of Pg 13.5, and its connector is of “VP” type

This sensor would be used in settings where real‑time, reliable pH measurement is needed under harsh or demanding conditions. Some examples:

Biopharmaceutical / biotechnology production, e.g. fermenters, bioreactors, where sterilisation (e.g. steam) is frequent and you need accurate pH control.
Hygienic food or beverage processing where cleaning and sanitisation/sterilisation are done in‑place (CIP / SIP).
Chemical processing, especially where pH may swing extreme and environment may be harsh (high/low pH, temperature, maybe some contaminants).
Water/wastewater treatment in situations needing durable, robust probe

Cambridgeshire, United Kingdom

5,791 km away

Model Number

InPro 3253/120/PT1000

Stock Number

P104.3146A

Machinery Masters View

Typical context for this category of equipment. Always confirm specifics with the seller.

Applications & Use Cases

Biopharmaceutical and biotechnology production, particularly in fermenters and bioreactors requiring frequent sterilisation and accurate pH control.
Hygienic food and beverage processing, where Clean-in-Place (CIP) and Sterilise-in-Place (SIP) procedures are common.
Chemical processing environments, especially those with extreme pH swings or harsh conditions.
Water treatment facilities for monitoring and controlling pH levels in various stages.
Laboratory and research settings requiring precise and stable pH measurement for critical experiments.

Typical Specifications

Typical pH Range: Units of this type commonly operate across the full pH scale, typically 0 to 14.
Operating Temperature: For this class of equipment, a typical operating range is 0 °C to 100 °C, allowing for sterilisation processes.
Maximum Pressure: Many pre-pressurised pH sensors are designed to withstand pressures up to 4 bar gauge.
Sensor Length: This model features a 120 mm shaft length, which is relatively short for in-line sensors, suitable for installations with limited insertion depth.
Temperature Compensation: Units commonly integrate a PT1000 temperature sensor for accurate temperature compensation.
Process Connection: A Pg 13.5 thread is a common process connection for this type of industrial pH sensor.
Reference System: Pre-pressurised liquid electrolyte systems with ceramic diaphragms and silver-ion traps are typical for enhanced performance in challenging media.
Maintenance Requirements: This design is low-maintenance, benefiting from its pre-pressurised and liquid-filled nature.

Frequently Asked Questions

A pre-pressurised sensor has an internal electrolyte that is kept at a higher pressure than the process medium. This helps prevent process media from entering the reference system, extending sensor life and improving stability, especially under fluctuating process pressures.

Machinery Masters Intelligence. General guidance for this category of equipment only, not a substitute for the seller's exact specifications. Always confirm details with the seller.