Mettler ToledoInpro 3253/120/PT1000 pH Electrodes

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The InPro 3253SG 120/PT1000 is an in-line industrial pH electrode (probe) intended for continuous process measurement rather than simple lab spot checks. It integrates both the pH sensing element and temperature compensation in a single unit, allowing accurate, real-time pH measurement in process lines, tanks, fermenters and reactors

Physical & Mechanical

• Sensor shaft length: ~120 mm — relatively short, good for installations with limited insertion depth.
• Process connection: Pg 13.5 threaded connection.
• Connector type: VP industrial connector for secure integration.
• Pressure rating: Up to ~4 bar gauge.

Temperature & Compensation

• Built-in PT1000 temperature sensor — provides temperature compensation for accurate pH reading.
• Operating range: ~0 °C to ~100 °C. 

Sensing & Reference System

• Glass pH sensing membrane with a pre-pressurized liquid electrolyte system — lowers maintenance and improves stability.
• Ceramic diaphragm — stable reference junction.
• Argenthal silver-ion trap cartridge — improves reference performance, especially in environments containing sulfides.
• Sterilisation & Hygiene
• Sterilisable/autoclavable — built to withstand repeated steam sterilization or autoclave cycles without losing calibration or performance.

Certifications & Approvals

• Typically supplied with industrial and safety certifications (e.g., ATEX, IECEx and CE) for use in hazardous zones and hygienic processing.

pH Range

• Suitable for pH measurement typically within 0 to 12 (depending on membrane type).

Summary

In essence, the Mettler Toledo InPro 3253/120/PT1000 is a high-performance industrial pH electrode designed for robust, low-maintenance in-line monitoring with integrated temperature compensation, suitable for sterilizable and process‐critical environments. Its pre-pressurized reference and rugged build help deliver stable pH measurements in demanding applications.