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Showing Results For: pH Probes

pH Probes

pH probes, also called pH sensors or pH electrodes, are devices used to measure the liquid pH levels, i.e., the acidity or alkalinity of a solution. pH refers to a measure of the hydrogen ions (H+) concentration in a solution, expressed from 0 to 14 on a scale, where 7 is considered neutral. A pH of less than 7 shows acidity, and greater than 7 indicates alkalinity. A pH probe is of great importance as it determines the solution’s chemical conditions. These sensors come in different shapes and are used in conjunction with pH meters for precise pH readability. Additionally, pH probes come in various types, with some models integrating special functionality, including measuring temperatures and auto-calibration features.

How Do pH Probes Work?

pH probes work based on the potentiometry principle, where the potential difference between the sensing element and a reference electrode is measured and used to determine the solution’s pH. They consist of a glass membrane–sensitive to changes in hydrogen ion concentration. This glass membrane creates an electric potential varying with the solution pH. When the probe is immersed in a solution, the hydrogen ion concentration difference between the internal filling and the tested solution causes an electrical potential difference across the glass membrane. A pH meter gives output in values, indicating the alkalinity or acidity of a solution.

Popular Types of pH Probes

There are various types of pH probes based on their electrodes and materials. Some of the popular types include:

  • Combination pH Probes – These are the most popular pH probes used, also known as Glass pH Probes. These probes comprise both the glass electrode for pH measurement and a reference electrode. The sensitive glass membrane at the probe tip is selectively permeable to hydrogen ions (H+). When the probe is immersed in a solution, H+ ions interact with the glass membrane, generating a potential difference.
  • Sealed Gel-Filled pH Probes – These pH probes are filled with a gel electrolyte that moistens the internal reference electrode and prevents the reference solution from leaking.
  • Half-Cell pH Probes – These probes integrate glass electrodes only and do not have an internal reference electrode. Instead, they rely on a separate reference electrode immersed in a reference solution.
  • PEI (Polyetherimide) pH Probes – PEI (Polyetherimide) pH probes, also known as solid-state pH probes or ISFET pH probes, are the most advanced pH sensing technology. These probes use a solid-state ion-sensitive membrane made of Polyetherimide or similar materials.
  • PVDF (Polyvinylidene fluoride) pH Probes – These are sensors used for measuring the pH level of a solution. PVDF is a type of fluoropolymer with unique properties, making it suitable for various applications, including pH sensing. These probes are widely used in scientific research, industrial processes, environmental monitoring, and other fields where pH measurement is paramount.

pH Probes and pH Meters: The Key Difference

In most cases, these two devices are often used interchangeably; however, it is not the case. A pH probe is an integral part of a pH meter that does not function without a pH meter. A pH probe measures the solution’s pH value, recording the hydrogen ion voltage and converting it into a readable pH value for the pH meter.

Application Versatility of pH Probes

pH probes measure acid and alkaline levels in solutions and their electrical potential, offering a wide range of use in applications, such as:

  • Water Quality Monitoring
  • Pharmaceutical Industry
  • Food and Beverage Industry
  • Research Laboratories
  • Education Institutions
  • Quality Control
  • Aquaculture
  • Swimming Pools
  • Biomedical and Clinical Applications
  • Agriculture Industry
  • Environmental Monitoring.

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Hanna Instruments
HI12883, Hanna Instruments
5 In Stock
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£ 252.18
Hanna Instruments
HI1286A, Hanna Instruments
40 In Stock
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£ 67.29
Endress+Hauser
Rohs Verified
CPS11D-7BT21, Endress+Hauser
2 In Stock
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£ 472.62
Endress+Hauser
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CPS11D-7BA21, Endress+Hauser
1 In Stock
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£ 348.66
Endress+Hauser
Rohs Verified
CPS11E-AA7BAA2, Endress+Hauser
10 In Stock
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£ 364.92
Endress+Hauser
Rohs Verified
CPL51E-8A7AHH2, Endress+Hauser
1 In Stock
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£ 212.27
Endress+Hauser
Rohs Verified
CPS11D-7AA21, Endress+Hauser
8 In Stock
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£ 349.87
Endress+Hauser
Rohs Verified
CPS11E-AA7AAA2, Endress+Hauser
10 In Stock
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£ 318.51
Chauvin Arnoux
Rohs Verified
P01710053, Chauvin Arnoux
90 In Stock
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£ 283.61
Chauvin Arnoux
Rohs Verified
XCP4-BNC, Chauvin Arnoux
99 In Stock
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£ 206.84
Chauvin Arnoux
Rohs Verified
XAG1-S7, Chauvin Arnoux
98 In Stock
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£ 128.84
Chauvin Arnoux
Rohs Verified
XCPST4, Chauvin Arnoux
100 In Stock
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£ 312.89
Chauvin Arnoux
Rohs Verified
XPT1-S7, Chauvin Arnoux
1 In Stock
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£ 111.50
Hanna Instruments
HI1270, Hanna Instruments
3 In Stock
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£ 40.57
Hanna Instruments
HI-1285, Hanna Instruments
1 In Stock
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£ 101.62
Hanna Instruments
FC200B, Hanna Instruments
2 In Stock
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£ 194.74
Hanna Instruments
HI73127, Hanna Instruments
33 In Stock
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£ 73.09
ProMinent
Rohs Verified
790488, ProMinent
6 In Stock
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£ 80.37
5 +
£ 77.88
10 +
£ 75.39
Hanna Instruments
HI1286, Hanna Instruments
41 In Stock
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£ 67.29
ProMinent
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304956, ProMinent
57 In Stock
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£ 136.32
Hanna Instruments
HI3210B/5, Hanna Instruments
1 In Stock
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£ 158.47
ProMinent
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150702, ProMinent
3 In Stock
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£ 211.02
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£ 204.49
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£ 197.94
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201005/51-18-22-0000-00-120/000,000, Jumo
1 In Stock
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£ 96.01
Hanna Instruments
HI1280, Hanna Instruments
80 In Stock
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£ 66.56
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201005/53-18-22-0000-00-120/000,000, Jumo
1 In Stock
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£ 84.54
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New Items
New items
HI1286, Hanna Instruments

HI1286, Hanna Instruments

Pronto On-Line pH/Conductivity Monitors These meters, powered by plug-in mains adaptors, can be hung above samples, to continuously display readings. Sealed to IP67. pH Monitor Double junction, plastic bodied electrode with 2m cable and BNC connector. EC 2-pin probe plus 2m cable with 1/2in.NPT thread for flow through mounting on tanks/pipes etc. Measurements are tempreature compensated. LED alarm and set point Calibration points Moulded hook for easy installation A replacement pH probe is available separately Weight (g) : 150 pH Conductivity (EC) Temp compensation Automatic 5 - 50°C Alarm set points 3 to 11pH ± 0.5 pH 0.70 to 3.50 mS / cm ± 0.20 Calibration 2 point at pH 4 and 7 single point adjust Supplied with probe; 12V mains adaptor; calibration solution; instructions.
New items
XCP4-BNC, Chauvin Arnoux

XCP4-BNC, Chauvin Arnoux

The Chauvin Arnoux conductivity cell with protected body is ideal for your conductivity measurements in the laboratory and/or in the field. The platinum poles are protected by PVC to reduce breakage even during extreme use. It is reliable, accurate measurements on a wide conductance range 0.1 μS to 200 mS with a cell constant close to 1 cm-1. It is suitable for a large number of applications and recommended for viscous samples and/or samples containing particles in suspension. It provides high accuracy even when the conductivity is low It has operating temperature from 0 to 60°C
New items
P01710053, Chauvin Arnoux

P01710053, Chauvin Arnoux

The Chauvin Arnoux XCP4ST1 conductivity cell has integrated temperature sensor. It is used to measure the electrolytic conductivity of solutions. It has conductivity measurement range from 0.1 μS/cm a to 500 mS/cm. It has temperature measurement range from 0 to 100°C. It has DIP 8 connector
New items
CPS11D-7BT21, Endress+Hauser

CPS11D-7BT21, Endress+Hauser

The Endress+Hausers provides a digital with memosens technology or analog pH sesnor with a long-term monitoring and limit control in processes with stable process conditions. Low maintenance For media with low conductivity Maximum process safety Data security thanks to digital data transmission
New items
201005/80-18-22-0000-00-120/000,837, Jumo

201005/80-18-22-0000-00-120/000,837, Jumo

ecoLine - pH electrode, glass shaft design Glass shaft design Wire or cartridge-style conductive system Application Drinking water monitoring and preparation Swimming pools Aquariums Greenhouse technology Stock no. 607-8526 607-8510 Shaft material: Glass Glass Diaphragm: Ceramic Hole Conductive system: Wire K cartridge Temperature range: 0°C to +60°C 0°C to +60°C Pressure range: 0 → 6 bar 0 → 6 bar Installation length: 120 mm 120 mm Electrode head: Screw head Pg 13.5 (S8) Active component: U glass UW glass Electrolyte: Gel (highly viscous KCI solution)
New items
HI3210B/5, Hanna Instruments

HI3210B/5, Hanna Instruments

Sealed pH / mV meter HI 9025C High-end instrument, immersible to a depth of 1 metre (IP 67). ABS case, non-slip and buoyant. Large LCD display gives pH values and temperature at the same time. Single or double point calibration, simplified by graphical symbol. Error symbol if calibration or electrode plug not suitable. Guarantees a high level of measurement accuracy. Equipped with a memory function and an mV function for measuring redox potentials. For this use, the redox electrode must be ordered separately. Automatic compensation for temperature between 0 °C and +100 °C. Automatic shut-off after 10 minutes inactivity. Supplied in case with adjustment screwdriver and standard pH 4 and pH 7 solutions. AAA alkaline batteries (stock no.: 591-657 ) also available separately from the catalogue. Measurement range: 0 → 14 pH / ±1999 mV (ORP) 0 °C → +100 °C Resolution: 0.1 pH; 0.1 mV; 0.1 °C Accuracy: ±0.01 pH / 1 mV (ORP) ±0.5 °C Supply: 4 x AAA batteries supplied Stock no. description 176-3235 pH / mV meter 176-3241 Spare pH electrode 176-3257 Spare temperature probe 390-6298 Redox electrode pH & Temperature Meters
New items
CPS11D-7BA21, Endress+Hauser

CPS11D-7BA21, Endress+Hauser

The Endress+Hausers provides a digital with memosens technology or analog pH sesnor with a long-term monitoring and limit control in processes with stable process conditions. Low maintenance For media with low conductivity Maximum process safety Data security thanks to digital data transmission
New items
CPS11E-AA7BAA2, Endress+Hauser

CPS11E-AA7BAA2, Endress+Hauser

The Endress+Hausers provides a digital with memosens technology or analog pH sesnor with a long-term monitoring and limit control in processes with stable process conditions. Low maintenance For media with low conductivity Maximum process safety Data security thanks to digital data transmission
New items
0650 2061, Testo

0650 2061, Testo

testo 206-pH1Instrument Sets The pH measuring instrument for fast checks on liquids. Combined pH immersion tip and temperature probe for fast and efficient temperature compensation. The Testo pH probe is leak-proof, maintenance-free, robust and not affected by dirt thanks to the large volume of gel electrolyte and the dual wall diaphragm. Maintenance-free gel electrolyte Automatic full-scale value recognition Built-in temperature probe 1, 2 or 3 point calibration possible TopSafe: Robust, water-tight, hygienic and dishwasher-proof protection case (IP68) TopSafe, protection case (included) Maintenance-free gel electrolyte Automatic full-scale recognition Built-in temperature probe 1, 2 or 3 point calibration possible Testo 206 pH1: Sensor pH electrode / NTC Measurement channels 2 Temperature compensation Automatic Display LCD, 2 line, 0 to 70°C Probes Screw-in pH/°C probe modules Measurement rate 2 per second Battery type 1 x CR2032 Battery life 80 hours (auto off 10mins) Housing ABS with Top Safe, protection class IP68 Dimensions 197 x 33 x 20mm Weight 69g Note Testo pH set stock no. 479-8492 is supplied with probe, gel storage cap, TopSafe protective cover and wall holder only. pH & Water Analysis - pH & Temperature Meters Testo 200 Series Instead of a liquid electrolyte, these probes use a gel as a reference substance for pH measurement. This facilitates the use of a hole diaphragm between the measurement electrode and housing in place of the micro-porous structure usually used in pH probes.They are almost completely maintenance-free, robust and unaffected by dirt and dust.,Gelcap,A potassium chloride solution is usually used to store pH probes which, as with every liquid, can leak. To prevent this the potassium chloride solution is available in a gel filled probe/meter cap that does not drip or leak.
New items
XAG1-S7, Chauvin Arnoux

XAG1-S7, Chauvin Arnoux

The Chauvin Arnoux electrode is used to perform redox potential measurements, you have to use this electrode with a reference electrode (recommended references BR43, XR43, BR44 see the Laboratory Reference Electrodes). The measurement electrode is the electrode sensitive to variations. When used with a reference electrode, it allows you to measure the oxidizing or reducing capacity of a specimen. Glass rod whose lower extremity is equipped with a metal fitting, in this case a silver rod. It is protected by a PVC housing It has operating temperature from 0 to 60°C
New items
HI-1296D, Hanna Instruments

HI-1296D, Hanna Instruments

Accessories for the HI 991001 Extended Range pH and Temperature Meter Accessories only
New items
HI12883, Hanna Instruments

HI12883, Hanna Instruments

Multi-Parameter Probe with PH, Conductivity and Temperature The HI-1288 is a spare pH electrode for HI-991300 (RS 410-1400 ), with cloth junction, 7-pole, 2 m (6.6') cable. The HI-1288 is a 3-in-1 pre-amplified multiparameter probe that measures pH, EC/TDS, and temperature within a single polypropylene body. The pH portion of this probe is constructed with a cloth junction, maintenance free polymer gel electrolyte, and a low temperature glass sensing bulb. The EC/TDS portion of this probe utilises two graphite sensors for an amperometric determination of conductivity and total dissolved solids. A built-in temperature sensor ensures that both pH and EC/TDS readings are compensated for temperature variations in both standards and samples. Features: Pre-Amplified pH Electrode Amperometric EC/TDS Sensor Built-In Temperature Sensor Polypropylene Body Uses a DIN Connector Applications: The HI-1288 is suitable for measuring the pH, EC/TDS, and temperature in greenhouses, hydroponics, environmental monitoring, water treatment, wastewater treatment and boilers and cooling towers.
FAQs
We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like pH Probes and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding pH Probes or any other product.
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Yes, we offer special discounts on orders above £200 for pH Probes and all other products.
UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including pH Probes.
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