HI5412 is a glass body, refillable, double junction, half-cell reference electrode with a 4 mm banana connector. This electrode has a single ceramic junction in an external reference cell and a calomel reference cell.

Glass Body

The glass body is ideal for laboratory use. The glass resists many harsh chemicals and is easy to clean. The glass body also allows heat to be transferred quickly to the internal reference electrolyte. The mV generated by the reference cell is temperature dependent. The faster the equilibrium, the more stable the reference potential.

Single Ceramic Junction

The outer junction of the electrode, also known as the salt bridge, is a necessary component of the circuit. The movement of ions must flow through the junction to obtain a stable reading. The external reference has a single ceramic frit. Ceramic is a porous material that easily fuses with the glass body and has a similar coefficient of expansion. The flow rate of the single ceramic junction is 15-20 μL/hour. Other junction types have higher flow rates and are made of different materials.

Refillable

HI5412 is a refillable reference electrode. Since it is a double junction electrode, the filling solution is HI7082 3.5M KCl. This solution does not contain any silver, unlike single junction electrodes. The absence of silver will prevent any silver precipitate from forming at the junction and clogging it. A clogged junction will cause reading drift and instability. 

4 mm Connector

HI5412 uses a 4 mm banana connector. This type of connector easily plugs into the reference input of a suitable meter. Other types of connectors include BNC, DIN, screw type, T-type, and 3.5mm, etc. These types of connectors tend to be proprietary to a specific type of meter and are not interchangeable.