Refillable Double Junction pH Electrode with BNC Connector – IC-HI1043B

The HI1043B is a glass body, refillable, double junction pH electrode with a BNC connector. This electrode has a single ceramic junction in the outer reference cell and the pH sensing portion is made with high temperature glass. This design consideration is ideal for hydrocarbons, paints, solvents, high conductivity samples, strong acids and bases, and for measuring samples at elevated temperatures. The measurement of pH at very high temperatures is detrimental to the sensitive glass bulb and will shorten the life of it. A pH electrode with general purpose (GP) glass will have a resistance of 100 megaohms at 25 C while the resistance of HT glass is around 400 megaohms at 25 C. As the HI1043B is used at elevated temperatures the resistance decreases and approaches the resistance of GP glass. The HI1043B is suitable to use with samples that measure from 0 to 100 C. The spherical bulb is for general purpose use. Other tip shapes include conic for penetration and flat tip for surface measurements. The glass body is ideal for laboratory use. The glass is resistant to many harsh chemicals and is easily cleaned. The glass body also allow for a fast transfer of heat to the internal reference electrolyte. The mV generated by the reference cell is temperature dependent. The faster the electrode reaches equilibrium, the steadier the reference potential. The HI1043B is a double junction design. pH electrodes are available as single junction or double junction. The outer reference has a single ceramic frit. The ceramic is a porous material that is easily fused with the glass body and has a similar expansion coefficient. A single ceramic junction has a flow rate of 15-20 uL/hour. Other junction types are available with higher flow rates and made with different materials. The HI1043B is a refillable probe. Since it is a double junction pH electrode the fill solution is the HI7082 3.5M KCl. This solution does not contain any silver as with single junction electrode. The absence of silver will prevent any silver precipitate from forming at the junction surface and clogging it. Clogging of the junction will result in drifty and erratic readings.

Specifications