The standard glass electrode has a specially formulated glass bulb that produces an electrochemical potential as a function of the hydrogen ion concentration on the outer bulb surface. Used in conjunction with a reference electrode, this glass bulb is submerged in the sample solution, and changes in the glass bulb potential are proportional to the pH of the sample solution.

The Broadley-James line of pH electrodes uses three different types of pH bulb glass. Each glass type is specially formulated to suit certain areas of application.

HT-3 and HT-4 are recommended for measurements at the highest pH values as the alkaline error of these glasses is very small above pH 12.

GP bulb glass is recommended for all measurements between 0–12 pH due to its superior response time and mechanical strength.

All purpose standard glass pH electrode design with a large spherical pH bulb for fast response.

Dome design is mechanically stronger than spherical bulb; response time is slower.

Primarily there are four things we need to know in order to correctly fill your order.

1. Electrode Model Number — Each electrode has a ten character model number.

2. Cable Type — All lab electrodes are equipped with Type A, low noise, 3 mm, coaxial cable. Place the A after the electrode number.

3. Cable Length — The cable length is expressed in feet immediately after the cable type. Example: "-A03" stands for a three foot cable which is standard for all electrodes in this catalog. Follow model numbers by a"-DK" for a threaded electrode cap.

4. Connector — The cable length is followed by a two letter designation for the proper connector. All connectors are available. If you do not see what you need on this page, give us the make and model numbers of your pH meter and we will supply the proper connector.

Example: C13PIA-521-AO3SC