November 2006Analytical Instrumentation & Environmental Monitoring
The purity and the colour tone of the textiles depend on the accurate measurement of the dye pH value. By controlling the pH value, undesirable reactions may be avoided and a highly defined product obtained.
Azo-dyes are produced through several stages in a reactor which is usually rubber coated. During the first stage the pH value is low (between pH 0 and pH 2) and the temperature less than 20°C. During the second stage the pH value is slightly raised (pH 3 to pH 5) and the temperature increases to between 40 and 50°C. During the last reaction stage the pH value is increased to 10 and the temperature is up to 90°C.
The measuring problems are caused by precipitated dyes and azonium salts which contaminate the junction. A variety of intermediate products may react with the reference electrolyte and compound the problem. The wide pH and temperature range of this process also puts special demands on the pH electrode, especially if repeatable accuracy at high pH and high temperature is required.
This problem has been solved by the patented pH differential technology from HACH which uses three measuring electrodes instead of the two in conventional pH sensors. The process electrode and the reference electrode measure the pH differentially with respect to a third ground electrode. This provides high accuracy, reduces reference junction fouling, and virtually eliminates ground loops. The benefit is greater reliability with less downtime and maintenance and makes these pH electrodes the preferred solution for this problem as well as for all harsh pH applications.
For more information contact Steve Herbst, PREI Instrumentation, +27 (0) 11 448 2172.
Oxygen measurement in beverages
Analytical Instrumentation & Environmental Monitoring
[Sponsored] Anton Paar offers a complete range of oxygen measurement instruments for total package oxygen (TPO) measurements, at-line quality control (QC), and in-process monitoring. These instruments help beverage manufacturers achieve accurate, reliable oxygen control at every stage of production.
Read more...Analysers achieve OIML R140/MID accuracy class A certification
Analytical Instrumentation & Environmental Monitoring
Qmicro by Sensirion has received the OIML R140/MID accuracy class A certificate No. TC12537 for its DynamiQ-X GC analysers for the analysis of natural gas and natural gas blended with hydrogen.
Read more...Sustainable water management Wearcheck
Analytical Instrumentation & Environmental Monitoring
Water sustainability is critical for the future wellbeing of people, land and marine ecosystems, and socio-economic development. WearCheck Water provides a range of water analysis techniques to determine water quality for various sectors, including mining, agriculture, domestic and the healthcare industry.”
Read more...Biofilm monitoring system Instek Control
Analytical Instrumentation & Environmental Monitoring
Alvim, through Instek Controls, provides innovative, high-tech solutions for biofilm and biofouling monitoring in industrial plants.
Read more...WearCheck Water earns AdBlue/DEF analysis accreditation Wearcheck
Analytical Instrumentation & Environmental Monitoring
WearCheck Water recently became the first laboratory in Africa to be officially ISO17025 accredited to test AdBlue diesel exhaust fluid by the South African National Accreditation System.
Read more...Streamlining strain gauge load cell integration Vepac Electronics
Analytical Instrumentation & Environmental Monitoring
Vepac’s data acquisition hardware provides an efficient and effective all-in-one solution for customers looking to simplify, enhance and optimise their strain gauge load cell systems.
Read more...Oxygen measurement in beverages Anton Paar
Analytical Instrumentation & Environmental Monitoring
[Sponsored] Anton Paar offers a complete range of oxygen measurement instruments for total package oxygen (TPO) measurements, at-line quality control (QC), and in-process monitoring. These instruments help beverage manufacturers achieve accurate, reliable oxygen control at every stage of production.
Read more...Sensors and controls for food, beverage and pharmaceutical Instek Control
Analytical Instrumentation & Environmental Monitoring
Included in Instek Control’s range is Anderson-Negele, which has adopted ‘Hygienic By Design’ as its guiding principle, with a particular focus on meeting the stringent regulatory requirements found in industries such as dairy, brewery or pharmaceutical.
Read more...Vertical labelling of test tubes in clinical laboratories Omron Electronics
Analytical Instrumentation & Environmental Monitoring
Werfen has implemented a new automated machine for the supply of reagents to drug toxicology laboratories, built by MACCO in collaboration with OMRON and Marini Pandolfi. It uses OMRON SCARA robots and advanced vision systems to ensure reagent quality through vertical handling and labelling process of test tubes.
Read more...Keeping a close eye on product quality and purity Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
Colour measurements are necessary in many processes to avoid product losses and ensure safe production and batching.
printer friendly version