Temperature compensated conductivity measurement from Foxboro
December 2018
Analytical Instrumentation & Environmental Monitoring
Measuring the conductivity of a liquid can reveal the concentration of salts dissolved in the solution. In fact, conductivity is often the method of choice for measuring the amount of salts dissolved in water – the salinity of natural water. When seawater mixes with fresh water the conductivity measurement can tell how much of each is present, referred to this as the percentage or concentration of seawater.
Thousands of process control applications involve solutions of an electrolyte in water or other solvent. From a conductivity measurement it is possible to monitor and control such solutions. It is a fairly simple, fast and accurate method. When measuring conductivity and converting this into a percentage concentration, the instrument will have programmed into it a predetermined conductivity vs concentration curve.
Temperature dependence
However, the temperature of the sample liquid also needs to be taken into account. This is essential because the conductivity reading changes with temperature, so it is important to know if it is the temperature or conductivity of the process that is varying.
To solve this problem, Foxboro has introduced its new 876EC conductivity transmitter, in which a temperature compensated conductivity measurement is performed and the concentration calculated in accordance to the chemical periodic table against a range of specific chemicals with predetermined curves.
The displayed value is referred to as the compensated percentage of the chemical concentration range. Using the Foxboro 876EC, this is determined by simply measuring the conductivity value.
For more information contact Johan van Jaarsveldt, EOH, +27 87 803 9783, johan.vanjaarsveldt@eoh-pas.co.za, www.eoh-pas.co.za
Further reading:
Why measurement matters in smelting
Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
South African smelters returning to operation after energy constraints face new demands for tighter control, better visibility and environmental compliance. Endress+Hauser explains how modern measurement technology supports safer, more efficient furnace operation and local beneficiation.
Read more...
Sun tracking with pinpoint precision
Senseca
Analytical Instrumentation & Environmental Monitoring
Senseca has introduced the SEMS-2000 solar energy measurement system, a 2-axis solar tracker with pinpoint sun-pointing accuracy that automatically monitors direct, global and diffuse irradiance for unattended outdoor solar installations.
Read more...
AMETEK expands 993X gas analyser series with explosion-proof enclosures
Analytical Instrumentation & Environmental Monitoring
AMETEK Process Instruments has added ATEX and IECEx Zone 1-certified explosion-proof enclosures to its 993X series of gas analysers, enabling reliable installation in Zone 1 hazardous locations where purge gas is unavailable.
Read more...
Why medical device leak testing matters for South Africa's MedTech future
ATEQ South Africa
Analytical Instrumentation & Environmental Monitoring
As South Africa works to grow local medical technology manufacturing, non-destructive leak and flow testing is becoming a strategic quality assurance tool, helping manufacturers verify device integrity, meet regulatory requirements and improve production efficiency.
Read more...
Moving forward with reverse osmosis
Analytical Instrumentation & Environmental Monitoring
Rising water costs and pressure on infrastructure are changing the way industries view reverse osmosis. G-Chem Aquacare is developing tailored, containerised solutions that make the technology more accessible for South African industry.
Read more...
Meteorological data logger with up to 32 analogue sensors
Senseca
Analytical Instrumentation & Environmental Monitoring
Senseca has introduced its advanced data acquisition system for environmental monitoring, which has a universal data logger for up to 32 analogue, pulse and smart digital sensors.
Read more...
Importance of gas analysis in the petrochemical industry
Elemental Analytics
Analytical Instrumentation & Environmental Monitoring
Gas analysis plays a critical role in petrochemical operations, supporting process optimisation, product quality and plant safety. As an experienced and expert gas analysis supplier, Elemental Analytics can provide the correct analyser and sample system package to meet individual plant requirements.
Read more...
Fully integrated standalone thunderstorm warning system
Senseca
Sensors & Transducers Analytical Instrumentation & Environmental Monitoring
Senseca South Africa has introduced its BTD-1 fully integrated, standalone thunderstorm warning system, which detects lightning by monitoring the background quasi-electrostatic field. The system can generate alerts before the first lightning strike, with a detection raterange of up to 83 km.
Read more...
Environmental monitoring with testo Saveris 1
Analytical Instrumentation & Environmental Monitoring
The testo Saveris 1 environmental monitoring system has been in continuous use since 2010 at Jungbunzlauer, a biotechnology company in Germany, providing seamless temperature and humidity data for audit-ready, GxP-compliant processes across laboratories, warehouses and production areas.
Read more...
Reliability restored through systemic vibration analysis
Wearcheck
Analytical Instrumentation & Environmental Monitoring
Condition monitoring specialist, WearCheck uses a variety of testing techniques to enhance reliability in machinery components and prevent failures.
Read more...
printer friendly version