Mettler Toledo InPro (Unused Boxed) 3253/120/PT1000 Pre‑pressurized, liquid‑filled, low‑maintenance pH sensor

• 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 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.

• 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?

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

• What kind of connector does this sensor use?

• Can this sensor be used in environments with sulfides?

pH meters and sensors attract strong buyer interest in laboratory, biotech and pharmaceutical settings. Industry consensus values accuracy, calibration stability and sensor longevity as critical factors. Used units typically offer good value if maintained properly. Buyers prioritise checking calibration history, electrode condition and display functionality before purchase. Reputable brands retain performance well. Common strengths include reliable readings in controlled environments and straightforward operation, though sensors require regular maintenance and occasional replacement to sustain accuracy standards.

General overview for this equipment type