The absolutely sealed H-type cell combines the two-compartment membrane setup with vacuum and a controlled gas atmosphere. The cathode and anode compartments are separated by an ion exchange membrane. This keeps products formed at one electrode from crossing to the other electrode and reacting again, and lets you control the electrolyte, pH and gas atmosphere of each compartment independently.
The flanges of the two compartments are joined with a chain clamp; opening the clamp lets you change the membrane in minutes. The reference electrode sits in the same compartment as the working electrode, which reduces the ohmic (iR) drop in solution. The PTFE inner core of the lid rotates 360° so the electrodes can be aligned with the channel (usually parallel to the membrane); tightening the outer POM cap then seals the cell.
In the absolutely sealed cell the electrodes plug into socket (jack) connections inside the lid, isolating the system completely from the outside. With valves fitted, the cell can be evacuated (below −100 kPa) or operated under slight pressure (max. 0.5 MPa, manufacturer data). The electrodes are made to fit this cell and must be ordered together with it.
The body is made of borosilicate glass 3.3, which has low thermal expansion (3.3 × 10⁻⁶ K⁻¹) and the highest resistance classes against water (HGB 1) and acids (S 1). Avoid sudden temperature differences above 120 °C to reduce the risk of breakage.
In the jacketed (double-layer) version an outer water jacket surrounds the inner cell. Water from a circulating thermostatic bath flows through the jacket via hose connections and keeps the electrolyte at a constant temperature during the measurement. Because the inner glass of the jacketed body is thinner, do not pressurize this version; vacuum and gas purging can be used.
| Cell type | Two-compartment H-type, absolutely sealed |
| Temperature control | Water jacket for a circulating thermostatic bath |
| Body | Borosilicate glass 3.3, externally threaded necks |
| Electrode connection | Socket (jack) in the lid |
| Vacuum / pressure | Below −100 kPa; slight pressure max. 0.5 MPa (manufacturer data) |
| Compartment joint | Flange + chain clamp, membrane supplied by user |
| Volume options | 30 mL, 50 mL, 100 mL, 150 mL, 200 mL, 250 mL |
| Not included | Electrodes and membrane (sold separately) |
A sampling port can optionally be added to the cell body; please mention it in your quotation request.
Valves are not included in the price. The valve kit for gas purging and vacuum is offered as a separate product (LM-EC-CELL-VALVE) and is ordered together with the cell.
Electrodes and membranes shown in the photos are for illustration only and are not included in the price. Compatible reference, counter and working electrodes and membranes are available in the Electrodes category of our site.
For volumes, dimensions or port layouts other than those listed, you can request a custom-made quotation through the Quotation Form.
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