InPro 4850i pH Probe - Overview - METTLER TOLEDO

InPro 4850i pH Probe

Dual-membrane pH probe for chlor-alkali processes

The InPro4850i combination probe for pH/ORP measurement in chlor-alkali processes, combines accurate measurement with durability. The probe's sodium-sensitive glass membrane uses the sodium concentration of the chlor-alkali process brine as a reference. This reference system has no diaphragm and is therefore immune to chlorine and other oxidizing agents that lead to failure in other electrodes. The high quality pH-sensitive glass membrane is extremely resistant to chlor-alkali process conditions, ensuring precise pH measurement. 
Intelligent Sensor Management (ISM®) technology with digital signal conversion avoids high impedance signal transition to the transmitter, and ensures 100% signal integrity and stability. ISM also offers sensor self-diagnostics, pre-calibration of sensors, and Plug and Measure start up to simplify installation and maintenance tasks.
The combination of dual-membrane, sealed reference system and digitized signal makes the InPro4850i an extremely reliable and durable solution to pH and ORP measurement in the chlor-alkali industry.


InPro 4850i pH Probe

Specifications - InPro 4850i pH Probe
Short description Dual-membrane pH Electrode
pH-range 0...14
Temperature range -10...120 °C (14...248°F)
Pressure resistance (bar) 0...13 bar at 120 °C
Pressure resistance (psi) 0...188 psi at 248°F
Reference system Sodium sensitive glass membrane
ISM yes
ATEX Certification SEV 14 ATEX 0168 X
Ex ia IIC T6/T5/T4/T3 Ga/Gb
IECEx Certificate of Conformity IECEx SEV 14.0025X
Ex ia IIC T6/T5/T4/T3 Ga/Gb
FM approval IS/ I, II, III /1 /ABCDEFG /T6
Length 12mm, 230mm
Features and Benefits
Dual-membrane; pNa reference system
  • Long lifetime, hermetically sealed, high accuracy and low maintenance thanks to sodium reference and absence of diaphragm.
Solution ground and shielding
  • Stabilize the signal and enable redox measurement.
Digital signal
  • 100% signal integrity. Immunity to electrical interference and signal distortion ensures stable and accurate data.
Intelligent Sensor Management (ISM®) technology
Compliance with safety regulations for Ex-classified zones
  • The electrode is Ex-certified and can be used for processes in Ex-classified zones.



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InPro 4850i pH Probe
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