pH Meters and Electrodes 

Hanna Instruments offers a wide variety of pH electrodes that are designed for many different applications. The type of glass used, body material, type of junction, type of reference and electrolyte used are just some of the design considerations.

The HI72911B uses general purpose (GP) glass, flat tip bulb, titanium body, and PTFE junction with polymer electrolyte.

General Purpose Glass Formulation
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 LT glass is around 50 megaohms at 25°C. As the temperature of the glass decreases in the sample, the resistance of the LT glass will approach that of GP glass. If using GP glass, the resistance would increase above the optimum range, resulting in increased impedance and ultimately affecting the measurement. The HI72911B is suitable to use with samples that measure from 0 to 80°C.

Flat Tip Bulb
The recessed flat tip bulb of the HI72911B is easy to clean and prevents solids in solution from collecting on the sensor. Other tip shapes include conic for penetration and spheric for aqueous measurements.

Titanium Body
A titanium body increases immunity to electrostatic and magnetic fields. It also allows for strong corrosion resistance, even in seawater.

PTFE Junction
Porous polytetrafluoroethylene (PTFE) is a hydrophobic material that is available with different porosities. This type of junction is often used on electrodes with polymer electrolytes. Because of its chemical advantages, PTFE is widely used in industrial applications.

BNC + RCA Connector
The HI72911B uses a BNC + RCA connector. This type of connector is universal in that it can be used on Hanna pH meters that have a female BNC connector for pH and RCA input for temperature. Other type of connectors include DIN, screw type, T-type, and 3.5mm to name a few. These types of connectors tend to be proprietary for a particular type of meter and are not interchangeable.