HI1144B is a glass body, refillable single junction pH electrode with a BNC connector. The electrode has a single ceramic junction in an external reference cell, and the spherical pH sensing portion is made of high temperature glass.

HI1144B features high temperature (HT) glass, spherical bulb, glass body, single ceramic frit, single junction, refillable 3.5M KCl.

High Temperature Glass Formulation

Measuring pH at very high temperatures is detrimental to sensitive glass bulbs and shortens their service life. pH electrodes with general purpose (GP) glass have a resistance of 100 megohms at 25°C, while HT glass has a resistance of approximately 400 megohms at 25°C. Since the HI1144B is used at high temperatures, the resistance is reduced to approach that of GP glass. The HI1144B is suitable for samples from 0 to 100°C.

Glass Body

A 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 electrode reaches equilibrium, the more stable the reference potential.

Single Ceramic Outer Junction

The HI1144B features a single junction design. This junction, also known as a 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 fuses easily with the glass body and has a similar coefficient of expansion. The single ceramic junction has a flow rate of 15-20 μL/hour. Other junction types have higher flow rates and are made of different materials.

Refillable

The HI1144B is a refillable probe. Since it is a double junction pH 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 drift and unstable readings.

BNC Connector

The HI1144B uses a BNC connector. This type of connector is universal because it can be used on any pH meter with a female BNC probe input. Other types of connectors include DIN, screw type, T-type, and 3.5mm, etc. These types of connectors tend to be proprietary to specific types of meters and are not interchangeable.