Hanna Instruments Australia
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Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm
Hanna Instruments Australia
Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm

Replacement pH Assembly for Ammonia ISE - HI4000-51

$934.95

The HI4000-51 is a replacement pH reference assembly for the HI4101 ammonia gas sensing ion selective electrode.

Combination pH assembly

pH sensitive membrane

Stable reference electrode

The HI4000-51 replacement pH reference assembly is for use with Hanna’s HI4101 ammonia gas sensing ion selective electrode (ISE). This internal glass pH assembly provides the sensing and reference components for the ammonia combination ISE.

Theory of Operation

A gas sensor works due to the partial pressure of the measured gas in solution. The dissolved gas in the sample diŽffuses into the membrane and changes the pH in a thin film of unbuffered electrolyte on the surface of the internal pH sensor. Diffusion continues until the partial pressure of the sample and the thin film of electrolyte are the same. The pH change is proportional to the concentration of dissolved gas in the sample solution.

SKU HI4000-51
Name Replacement pH Assembly for Ammonia ISE – HI4000-51

Replacement pH Assembly for Ammonia ISE – HI4000-51

All prices are inclusive of GST and not all items are stock items, if you require an immediate solution please send an email to sales@hannainst.com.au or call us on (03) 9769 0666.


Free standard delivery:

We offer free delivery within Australia, typically arriving within 5 to 7 days. Delivery times may vary depending on the courier service and the recipient’s location.


Same-day express delivery:

Place your order before 1 PM Monday to Friday for the same-day express shipping. Delivery times may vary depending on the courier service and the recipient’s location.

Please note that we do not offer shipping to PO Box addresses.

All prices are inclusive of GST and not all items are stock items, if you require an immediate solution please send an email to sales@hannainst.com.au or call us on (03) 9769 0666.

Please note that we do not offer shipping to PO Box addresses.