New Product Launch: G055 Calculation Type pH Meter

backgroundIn various steam cycles, power plants correctlypHMeasurement is a key factor in corrosion risk monitoring. Glass can be usedpHThe electrode is used for measurement, but it needs to be designed for low conductivity, high temperature, and high pressurepHElectrode. By measuring the conductivity before and after the strong acid ion exchanger, accurate results can also be obtainedpHValue. These measurement values are used for calculationpHValue. This is a widely accepted method that does not require high temperature and pressurepHProbe. This type of measurement,Applicable toWater supply and boiler water are very popular in Europe.

Water quality requirements for power plants

In the power plant process, the water usedpHValue is crucial. becausepHWater with values exceeding the recommended range may cause corrosion of equipment and infrastructure. For power plants, unexpected maintenance or shutdowns caused by corrosion are quite expensive. By monitoring the water usage of power plantspHAnd conductivity, these parameters can be controlled to reduce maintenance requirements.

Measurement Challenge

Use standard glasspHDirect electrode measurementpHThere are several challenges to the value. The most critical challenge is to obtain accurate measurements of pure water and ultrapure water used in power plant operations. Using standard electrodes under pure or ultrapure conditions may result in unstable and incorrect readings. In addition, the operating conditions within the power plant may generate destructive potentials, which can cause measurement deviations. ultrapure waterpHContinuous measurement of values also requires frequent electrode maintenance. standardpHThe electrode is fragile and requires routine calibration. A more accurate and reliable alternative is to use differential conductivity measurementpHValue calculation.

NUSConductivity andpHrelationship diagram

Dissolved oxygen measurement in corrosion protection

includingVGB(Germany) andEPRISeveral organizations, including the United States, suggest conducting additional corrosion testing based on dissolved oxygen concentration. Cleaner water typically has a higher dissolved oxygen content, providing better corrosion protection for steel pipes. If high-purity water cannot be achieved, corrosion protection depends onpHThe impact of value is greater. Therefore, correct measurementpHValue is very important.

Calculation of Differential Conductivity in Pure Water and Ultra Pure WaterpHvalue

By differential conductivity（EC）Setting uppHValue calculation:

Two measurements must be taken simultaneously before and after the strong acidic cation exchangerECProbe. This setting measures two differentECValue. The probe before the cation exchanger measures specific conductivity, while the probe after the cation exchanger measures cation conductivity.

PHValue calculation formula

VGBstandardVGB-S-006-00-2012-09-ENCalculate using the following formulapH 7.5topH 10.5Pure water within the range/Ultra pure waterpHvalue:

pHB = log [CondSC – (CondCC/ 3)/ CB] + 11

calculatetypepHAdvantages of Value Measurement

Based on differential conductivity measurementpHCalculation is based on traditional glass electrodespHReliable and low maintenance alternative solutions for measurement. This technique is possible even in samples containing alkaline reagent mixtures. Advantages include: no glass in low conductivity samplespHTypical limitations of electrodes, calculatedpHMore accurate value.With glasspHCompared to electrodes,ECSensors remain stable for a long period of time with minimal maintenance.This algorithm produces reliable results

Due to the linear relationship between concentration and conductivity (compared to concentration and conductivity)pHThe logarithmic relationship between values results in higher sensitivity.

If you would like to learn more aboutG055series-Computational typepHplanFor product content, please feel free to contact Dongyuan Technology sales personnel.