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High Alkaline pH Electrode Model 9037-10B For Sodium Ion Error Reduction 

High Alkaline pH Electrode Model 9037-10B

The  9037-10B High Alkaline pH Electrode has been designed for high pH applications where Sodium Ion Error occurs. For applications where the pH is above a value of 12 and precision pH measurement is critical then we recommend the 9037-10B for Sodium Ion Error Reduction.

High Alkaline pH Electrode Model 9037-10B Introduction

Sodium Ion Error or High Alkaline Error is occurs in very alkaline solutions - that is - solutions with a very high pH value. The ratio of Hydrogen Ions to Sodium Ions is such that most pH electrodes will begin to respond to the concentration of Sodium Ions. As the pH electrode responds to the sodium ions present this causes a millivolt signal to be sent to the pH instrument. This mV signal is effectively a false positive causing the instrument to interpret this signal as a pH value lower (trending towards an acid) than the actual value.

The 9037-10B is designed as a high alkaline pH electrode to specifically combat sodium ion error in pH electrodes giving minimal sodium ion error above a pH of 13. Using a combination of special glass, dome shaped bulb and a special reference filling material we have minimised sodium ion error in our pH electrode.

The 9037-10B is a sealed double junction pH electrode with ceramic annular peripheric reference junction and domed glass bulb for precision readings and rapid response. The double junction protects the pH electrode against electrode poisoning and the special glass and filling solution give precision results at high alkaline / high pH values to minimise sodium ion error.

High Alkaline pH Electrode Model 9037-10B Features & Benefits.

The 9037-10B is designed to combat sodium ion error at high pH values in excess of 13 pH.

The 9037-10B offers excellent repeatability, a non-fouling peripheric annular double junction which is resistant to electrode poisoning. The glass bulb and special reference solution are designed for use in high alkaline applications to minimise sodium ion error. The dome shaped glass bulb gives a quick response time and is designed to ensure that it can operate this way at a pH above 13.

This is pH electrode has been uncompromisingly designed for high alkaline solutions to reduce sodium ion error, as such it is only suitable for a pH range of 2 - 14 pH and at temperatures of 0 - 100°C.

The 9037-10B pH electrode is widely used with our pH controller range, our inline electrode holders and our portable pH meters.

The mounting cap on the Low Conductivity pH Electrode model 9037-10B is Ryton with a small flange for mounting the pH electrode into our PES style holders.

High Alkaline pH Electrode Model 9037-10B Connection Types and cable length.

The 9037-10B pH electrode is available with a number of connection types; as standard we supply the 9037-10B with 3 metres of connecting cable and a BNC fitting.

For custom fitting types please see the below table for the ordering number and options:-

9037 - XX - Z

High Alkaline pH Electrode for reducing Sodium Ion Error - Model Number.


Cable Length

10 = 3 Metres

20 = 6 Metres

30 = 9 Metres


Connection Type

B = BNC Connector (Most Common)

T = Stripped & Tinned Connections

S8 = S8 Connector (No Cable)

A = U.S. Standard Connector fitted to older U.S. pH Instruments

I = Din 19262 Connector for German pH Instruments

K = Belling Lee Connector for older U.K. pH Instruments

More information on pH electrode connection types

The 9037-10B Double Junction pH Electrode maybe used as a replacement for many other manufacturers electrodes, often outperforming the original electrodes. 

Double Junction pH Electrode 9037-10B In Summary

Range pH: 2 - 14 pH

Operating Temperature: 0 - 100°C

Response Time: Quick

Electrode Type: High Alkaline pH electrode for reducing Sodium Ion Error, sealed double junction, special glass & special reference filling material.

Reference Type: Double Junction with non mercury reference.

Junction Type: Non-Fouling Peripheric Annular Ceramic Type.

Dimensions: 110mm Long  x 12mm ∅

Model Numbers Available Ex-Stock:

9037-10B - Glass pH Electrode with 3 metres connecting cable & BNC fitting.

9037-10T - Glass pH Electrode with 3 metres connecting cable & stripped and tinned connections.

Ordering: Please Specify model using 9037 and then the naming convention defined in the above table for cable and connection type.

pH Electrodes Data Sheet

pH Electrodes Data Sheet