Hanna Instruments HI-72911B Industrial Use pH Electrode
The HI-72911B is a titanium body, polymer filled, double reference junction pH electrode with a BNC + phono connector. This flat tip sensing portion of this electrode is made with general purpose glass.
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.
Specifications
| Body Material | titanium |
| Reference | double, Ag/AgCl |
| Junction / Flow Rate | PTFE |
| Electrolyte | polymer |
| Range | pH: 0 to 12 |
| Max Pressure | 3.0 bar |
| Tip Shape | flat |
| Diameter | 14 mm |
| Body Length / Overall Length | 110 mm / 150.5 mm |
| Recommended Operating Temperature | 0 to 80°C (32 to 176°F) - GP |
| Temperature Sensor | Yes |
| Matching Pin | No |
| Amplifier | No |
| Digital | No |
| Cable | 7 pole; 1 m (3.3’) |
| Connection | BNC + phono |
| Applications | Boilers, cooling towers |
| Warranty | 6 months |
Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.