IKA LR 1000.65 pH electrode holder, for LR 1000, 0004663400

Hermetic System Integration and Vacuum Architecture

In the chemical process control of complex polymerisations or during the synthesis of high-viscosity emulsions, precise control of the reactor atmosphere is a fundamental thermodynamic prerequisite. The insertion of an analytical pH electrode (such as the IKA LR 1000.64) must under no circumstances compromise the physical isolation of the reaction chamber. The IKA LR 1000.65 pH probe holder acts as a high-precision mechanical adapter to couple the sensor absolutely gas-tight to the standard-threaded lid of the LR 1000 laboratory reactor. The precisely engineered fits and sealing elements of the holder prevent the ingress of atmospheric oxygen during moisture-sensitive reactions carried out under inert gas and ensure that the system vacuum is maintained without interruption during high-speed degassing of viscous media.

Mechanical stabilisation against rheological lateral forces

In addition to providing a thermodynamic seal, the holder fulfils a vital static protective function. Highly viscous, non-Newtonian fluids, in combination with the rotation of heavy anchor stirrers, generate immense tangential and radial flow vectors. These hydrodynamic shear forces exert massive lateral (sideways) pressure on the fragile glass shaft of the pH electrode. The LR 1000.65 holder rigidly secures the electrode in its axial position and completely absorbs the resulting bending moments and mechanical vibrations. This resonance suppression physically prevents catastrophic glass breakage within the reactor, which would inevitably lead to the physical and chemical destruction of the entire batch.

Metrological reproducibility and material integrity

For a metrologically error-free in-situ measurement, the ion-selective membrane of the electrode must remain continuously and precisely within the reactor’s designated fluid-dynamic turbulence zone. The holder allows the immersion depth (Z-axis) to be adjusted with millimetre precision and permanently locks the sensor in place against the hydrostatic buoyancy or suction caused by the agitator. To maintain structural integrity even at the maximum temperatures of 120 °C prevailing in the LR 1000 and to withstand corrosive solvent vapours, all components of the mounting that come into contact with the medium are manufactured from highly chemically inert industrial materials.

Technical details

• Product type: Probe holder / Mechanical sensor adapter
• Process function: Hermetic sealing and static fixation
• Vibration mechanics: Absorbs lateral bending moments and hydrodynamic shear forces
• Compatibility (reactor): Exclusively compatible with IKA LR 1000 lid systems
• Compatibility (sensor): Designed for the IKA LR 1000.64 pH electrode (or 12 mm standard shanks)
• Vacuum compatibility: Ensures the system remains hermetically sealed during evacuation
• Thermodynamic resistance: Designed for reactor temperatures up to 120 °C
• Installation: Form-fit mounting in the standard-threaded ports of the reactor lid
• Adjustability: Allows for stepless adjustment of the axial immersion depth

Scope of supply

• 1 x IKA LR 1000.65 pH probe holder

(Important note: The pH electrode, temperature sensors and the LR 1000 reactor vessel are not included in the scope of delivery!)

Custom requirements & accessories

The probe holder is a purely mechanical bridge component. For analytical operation, it absolutely requires the corresponding IKA LR 1000.64 pH electrode (item no. 0004663300). Continuous metrological recording of the potentials also requires the IKA LR 1000 control base station, as the basic model does not have the necessary electrical sensor infrastructure. Please contact our procurement service at any time for the thermodynamically and statically correct configuration of the sensor system in the reactor lid.