HI-72911B Industrial Use pH Electrode

The HI-72911B has a PTFE type junction along with a built-in temperature sensor. This design consideration is ideal for measuring the pH in boilers and cooling towers. The HI-72911B is designed for use with Hanna’s HI-98191 pH meter.

• Unbreakable Titanium Body
• Built-In Temperature Sensor for Automatic Temperature Compensation
• Large Annular PTFE Junction with Increased Surface Area for the Reference Cell

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 HI-72911B is suitable to use with samples that measure from 0 to 80°C.

Flat Tip Bulb

The recessed flat tip bulb of the HI-72911B 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 HI-72911B 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.