Hanna Instruments

Scientific Equipment

Safety Data Sheets

SDS search & quick download

Free Delivery

Most of mainland GB for orders over £50. Other charges may apply - see more

Hanna Care

We take the long view, looking after existing customers as much as delighting new ones!

Certificates of Analysis

Download a copy of the certificate of analysis for your solution

HI-2031B Glass Body Refill Spear pH Electrode for Dairy

HI-2031B Glass Body Refill Spear pH Electrode for Dairy

Hanna HI-2031B Glass Body Refill Spear pH Electrode for Dairy

HI-2031B Glass Body Refill Spear pH Electrode for Dairy

Ideal for use with dairy products
In Stock
£193.20 (exc. VAT) £231.84 (inc. VAT)

The Hanna HI-2031B is a glass body single junction refillable spear tip pH electrode suitable for dairy and semi-solid products.

HI-2031B Glass Body Refill Spear pH Electrode for Dairy information

Hanna's extended description

HI-2031B Glass Body Refill Spear pH Electrode for Dairy

The HI-2031B is a refillable, conical tip combination pH electrode, designed to be used for testing of dairy and semi-solid products.

This electrode has a 1m cable and BNC connector.

Tips for the most accurate measurements

    Keep electrode hydrated

Ideally, pH electrodes should be kept in a storage solution when not in use. Placing the electrode in a small glass filled with storage solution is suitable. An option for pocket meters is to place a small piece of sponge into the meter’s cap and pour storage solution (HI-70300) into the cap to wet the sponge. Alternatively, purchase HI-740200 specialised electrode caps for storage. Pouring off any excess solution beforehand, the cap can then be placed on the meter.

    Clean electrodes before use

Clean the junction of your electrodes once a day or at least once a week to prevent junction clogging and to maintain accuracy. Immerse the electrode in the proper cleaning solution for at least 15 to 20 minutes. Hanna offers a wide range of cleaning solutions for general purpose and specific applications.

    Replace electrode once a year

If your electrode takes too long to stabilise a reading, or readings fluctuate wildly, it is most likely time to replace the electrode. The typical life span of any pH electrode is from 6 months to 1.5 years.

BNC Connection – BNC is one of the most commonly used connector types in pH meters and electrodes. Compatible with any meter or electrode that uses BNC connectors.

Best electrode care for great results

Keep the electrode hydrated

Why – Drying out the electrode leads to drifting pH values, slow response times, and incorrect measurements.

Fix – “Revive” a dry electrode by submerging the bulb and junction in pH storage solution for at least one hour.

Rinse, do not wipe your electrode

Why – wiping the pH glass can produce a static charge which interferes with the pH reading of the electrode.

Fix – Simply rinse the electrode with distilled or deionised water (DI). Blot (do not rub) with a lint-free paper towel to remove excess water.

Store your electrode in storage solution

Why – Storing in deionised water (DI) causes ions to leach from the glass membrane and reference electrolyte resulting in a slow and sluggish response.

Fix – Store your electrode in storage solution.

Clean your electrode regularly

Why – Deposits can form on the electrode during use, coating the sensing glass. This can lead to erroneous calibrations and readings.

Fix – Clean the electrode using a specially formulated cleaning solution for pH electrodes – ideally one that’s developed for your application.

Calibrate often

Why – All pH electrodes need to be calibrated often for best accuracy.

Fix – The frequency of calibration depends on how accurate you want to be – daily calibration is ideal.

Pick the right electrode for your sample

Why – General purpose electrodes are functional for a wide variety of applications but not ideal for all samples.

Fix – Based on your sample you may require an electrode designed for food, high-low temp, non-aqueous, or other types of samples.

Open or loosen the fill hole cap

Why – A closed electrode fill hole may lead to slower stabilisation times.

Fix – Loosen or remove the fill hole cap. Remember to put it back when storing the electrode. (Not applicable for non-refillable electrodes).

Keep the electrolyte level full

Why – Electrolyte flows out from the reference junction over time. Low electrolyte levels may cause erratic readings. (not applicable for non-refillable electrodes).

Fix – Ensure that your electrode fill solution level is no less than one-half inch from the fill hole cap.

Properly submerge your electrode

Why – Both the pH sensing glass and reference junction need to be completely immersed in order to function properly.

Fix - Add enough sample to submerge both the junction and sensing glass.

Inspect your electrode

Why – Over time, the sensing portion of the glass becomes less responsive and will eventually fail. Damage from use is also possible. This will cause erroneous readings.

Fix – Check your electrode for damage and perform a slope and offset calculation.


Specifications list


Reference Single, Ag/AgCl
Junction Ceramic, single
Connector BNC
Electrolyte KCl 3.5M + AgCl
Max Pressure 0.1 bar
Range 0 to 12 pH; -5 to 70°C
Tip Shape Conic (6 x 10 mm)
Temperature Sensor No
Amplifier No
Body Material Glass
Recommended Use Dairy and semi solid products

Questions & Answers

Got a question to ask? Use this form to submit your question.
Question will be displayed after moderation.
Name* Product Question*
No questions yet?
Don 't be shy, be the first to ask.