Innovative solutions for optimal process monitoring.
The determination of the pH value plays an essential role in all branches of industry. Frequently, pH measurement is used to monitor product quality or chemical reactions. The pH value is related to the hydrogen ion concentration (H+) in an aqueous solution and hence also to the acidity of the solution. The pH in water can (theoretically) vary between 0 to 14, with 0 being the acidic end of the scale and 14 being the alkaline end.
The conditions under which pH measurement is performed in an application can vary widely, ranging from wastewater and chemical mixtures, to ultra-pure water in power plants or in the life science industry.
With a fully automatic measurement of the pH value by an online process analysis system, a fixed and defined measurement setup is ensured. Online analysis systems are specially configured for use in aggressive environments and produce robust and reproducible measurement results through consistent positioning of the electrode, in the designated measuring point. The measurement results can thus be generated 24/7 and allow close-meshed and fully automatic monitoring of the process. Limit value violations or results are reliably forwarded to the process control system. With the support of predefined calibration and conditioning routines, reliable online pH measurement is guaranteed.
Therefore, online pH measurement is a robust and durable alternative to manual laboratory measurement.
If water-mixed cooling lubricants are used in the machining production of mechanical components, it is important to be able to produce them in a high-quality manner.
Incorrect concentration of the cooling lubricants often has a series of consequences, such as microbiological contamination, increased parts scrap and tool breakages. Insufficient quantities in the machine tank cause, among other things, increased temperature or foam formation. A constant concentration and an optimum filling level in the system are ensured by the automatic dosing of the cooling lubricant.
Therefore, fully automatic mixing devices including the corresponding sensor technology, which supply fresh, stable and completely homogeneous cooling lubricants in the desired concentration and quantity at all times, are used. The correct dosing and homogeneous mixing of the coolant thereby ensures optimum cooling, lubrication and cleaning.
By knowing the refractive index, conclusions can be made about the concentrations of certain substances dissolved in the medium under investigation. The mode of operation is based on the principle of total internal reflection, a special case of the physical laws used to describe optical refraction. It predicts how the direction of propagation of light changes as it passes from one medium to another. This principle is used for measuring the concentration of water-based cooling lubricants.
In-line concentration measurement increases reliability and safety while reducing maintenance costs. Real-time continuous concentration results are being provided. These are comparable to those of laboratory refractometers. The in-line measurement enables automatic monitoring and control of the cooling lubricants concentration. After a single factory adjustment, the measuring instrument operates with the stored adjustment values throughout its entire service life.
The separation performance of filters can be assessed by determining the number of particles in the filtrate. Various classification systems have been derived for coding the particle number, which indicate a certain particle content of a suspension in purity classes. They include, among others, the following:
An online particle measuring device can hence be used to ensure permanent quality control of the filter system. The specified cleanliness classes of the classification systems are based on particle size, particle number and particle size distribution.
ISO 4406 stipulates a three-digit code for the classification of the number of particles. The three classes are specified as > 4 µm, > 6 µm and > 14 µm cumulative.
NAS 1638 is the pioneer in the determination of cleanliness classes. It defines
5 cleanliness classes, with differential counting in ranges of 5 µm – 15 µm, 15 µm – 25 µm, 25 µm – 50 µm, 50 µm – 100 µm and >100 µm.
SAE AS 4059 specifies the particle count cumulatively for ranges of > 4 µm, > 6 µm,
> 14 µm, > 21 µm, > 38 µm and > 70 µm.