Automobiles, aircraft, marine vehicles, uninterruptible power supplies and telecommunications hardware represent areas utilising series-connected battery stacks. These stacks of individual cells may contain many units. In such systems, it is often desirable to accurately determine each individual cell’s voltage. Obtaining this information in the presence of the high ‘common-mode’ voltage generated by the battery stack is more difficult than might be supposed.
In this white paper, Jim Wallace, associate director of the Seaward Group, offers an overview of the in-service inspection and testing of electrical equipment and appliances. It is doubtful whether any single issue has raised as much discussion and debate in the electrical services industry as that provoked by portable appliance testing.
Steam is used in a range of industries for a variety of processes, from a basic small heating circuit to large-scale hygienic steam production, involving specialist equipment that needs to be designed and maintained properly to ensure efficient and reliable operation of the process equipment. Bürkert UK’s Ian Webster looks at some of the basic calculations that should be understood by design and maintenance engineers in order to achieve a safe and efficient process.
Generating power can mean the use of a diverse range of technology, from a simple coal-fired facility to the latest in nuclear plants. But all have one thing in common: the need to control heat and produce steam — and this generally necessitates using large volumes of process water. This article from Industrial Purification Systems discusses the use of modern filtration technology as a means to improving both heat transfer efficiencies and plant protection.
Technical article: compact and efficient piezo actuation chain for aeronautical applications download
Many past and ongoing studies are focusing on the use of piezo-actuators for aeronautical applications. One of the trendiest topics is the use of such devices for active flow control in aircraft in order to reduce fuel consumption and noise. However, the implementation of such systems in aircraft suffers a lack of maturity with respect to aeronautical constraints, which are high efficiency, compactness and light weight.
In this technical bulletin, Master Chemical highlights the visible part of the Hazardous Materials Index System or HMIS. This system is used by the industry to quickly communicate health and safety information in a uniform visual manner to the end user of the product. This voluntary system was created to provide a quick reference to critical health and safety information.
The Hazard Communication Standard requires that companies using hazardous materials maintain a file of the current material safety data sheets (MSDSs) for all the materials listed in their hazardous material inventories. It is the user’s responsibility to request that the organisation supplying the product delivers the current MSDS to them. Master Chemical maintains pdf copies of the most current MSDSs on its website for customers.
This guide from Sensonics explains the basics of vibration and expansion measurement techniques relating to turbine and auxiliary plant equipment. The guide starts with an introduction to the basic transducers available for plant mounting with associated options and details the various measurement techniques used as standard throughout the power industry.
Before the IEC 62310, prior to 2008, there was no product standard for the ‘static transfer system’ (STS). The closest standard used by manufacturers was the IEC 62040 (uninterruptible power systems, or UPSs). Indeed it is a good reference, but the weak points are definitions and tests. This paper from Socomec explains why users should ask for IEC 62310-compliant STSs.
According to Steve Cupples of Industrial Purification Systems, industry worldwide uses water in many different ways and in different amounts; therefore, water-saving technology is, in many cases, used in multiple applications. The commonalities, however, are that highly efficient water-saving techniques are proven to not only reduce an organisation’s carbon footprint but also to make huge savings on energy bills and improve production and performance.
This paper details a test bench design and the results obtained with CNES on two-piezo ceramics stacks from two distinct suppliers. Integration into dedicated cryo actuators is also proposed as well as the associated cryo performances. The use of such cryo-compatible actuators is detailed in a fine steering tip-tilt mechanism designed to reach very high resolution and stability for the ESA EChO space mission.
In this article, Cedrat Technologies presents the moving iron controllable actuator (MICA) and its characteristics under closed-loop control operations. MICA is a magnetic actuator with a high-density force, a low-mass moving part and the capability to inverse the force with the inversion of the current. The guiding is made of blades and thus avoids friction that would introduce hysteresis.
In wet chemical analysis, complete dissolution of the samples is required for the determination of the total concentration of elements. Especially for silicate-containing samples, the usage of hydrofluoric (HF) acid is a necessity. In order to digest and extract all metals quantitatively from matrices containing silicates and oxides, normally digestion with hydrofluoric acid is carried out in a two-step procedure.
As this technical guide from Socomec UPS explains, an RS485 bus is defined by the standard EIA-TIA-485-A and the TSB-89-A application guidelines. A RS485 transceiver is from a standard point of view connected through three points on the network.
This white paper from Apex Supply Chain Technologies presents a discussion of the latest trends and opportunities for the management of mission-critical operational assets with cloud-based, self-service automated locker systems without a requirement for the RFID tagging of individual assets.