Hanna Instruments HI-4110-51 Fluoride Module for Combination Electrode
The HI-4110-51 is a replacement sensing module for the HI-4110 fluoride combination ion selective electrode.
- Fluoride-sensitive crystal membrane
- Secure o-ring seal
- Easy to replace
The HI-4110-51 easy-to-fit fluoride module is for use with the HI-4110 fluoride combination ion selective electrode (ISE). The module is a lanthanum fluoride (LaF3) crystal membrane that contains openings within its lattice structure that allow fluoride ion exchange between the sample and internal solution. A charge imbalance develops between the sample and the internal cell in response to the fluoride ion activity. The potential change is proportional to the concentration of ions in solution.
The HI-4110-51 fluoride combination module easily screws onto the HI-4110 probe body, allowing for quick assemblage or replacement. Hanna recommends pre-soaking the fluoride sensor in a standard near expected concentrations before calibration. Conditioning in this way will activate the sensing crystal and help optimise the sensor response. Gently shaking the sensor down before measurement will place the internal solution next to the sensing membrane, ensuring reliable, accurate measurements.
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.