The terms functional safety and safety integrity level (SIL) have occurred more frequently since the publication of the international standard IEC 61508/IEC 61511. Particularly in systems with hazard-causing processes, such as in chemical plants, the consideration of functional safety has become indispensable. On this basis, safety-related practices, design principles and error considerations must be met to minimise the risk of a dangerous failure.
UWT’s rotary paddle level switch for overfill and dry run protectionThe UWT engineers focused on this topic and redesigned the rotating paddle switch Rotonivo RN 6000 series according to the normative requirements of functional safety to ensure safety functions and risk mitigation in accordance with SIL2. Typical safety functions are over-fill and dry-run protection.
Depending on the requirements, the Rotonivo rotary paddle switch is used as a full, demand or empty detector in storage silos or process vessels and is suitable for use in almost all solids. With its simple electromechanical measuring principle, it can also be adapted for extreme process conditions. A motor driven shaft causes the vane to rotate. Once the material level reaches the vane, thereby preventing further rotation, this creates a torque, which is converted via a switch to an electric signal. Once the vane is free again of the material, the output signal is reset and the motor driven shaft rotates again.
As part of the functional safety issue, the electronics of the rotating paddle series have been configured so that any failure of electrical components leads to a safe switching state of the output signal thus avoiding potential system hazards. With the innovative SIL2 compliant Rotonivo RN 6000 series, operators of safety-related systems have access to a level sensor in accordance with the specified SIL.
A fresh approach to dairy processing VEGA Controls SA
Level Measurement & Control
Ensuring the quality and safety of milk throughout the production process is of the utmost importance in the dairy industry. The VEGABAR pressure transmitters are suitable for hygienic applications. They are an asset in the dairy industry and have been used with success for measuring the milk level and the process pressure in storage tanks.
Read more...Level measurement of an acid dosing tank at a WWTP
Level Measurement & Control
Ferric chloride and other acids are essential chemical substances in water and wastewater treatment. To control the dosing of acid solutions, an Australian wastewater treatment plant uses a special container to store, mix and add these chemicals. The company opted in favour of KROHNE’s OPTIWAVE 1540 radar level transmitter
Read more...Level measurement of leachate from sewage sludge humification
Level Measurement & Control
A municipal utility in eastern Germany operates a state-of-the-art wastewater treatment plant with sustainable sludge treatment. The ultrasonic signal was being partially deflected by the wind, leading to frequent false measurements and inefficient process workflows. The problem was solved by replaced the ultrasonic level sensor with KROHNE’s OPTIWAVE 1540 non-contact radar.
Read more...Groundbreaking measurement system Mecosa
Level Measurement & Control
Berthold Technologies has launched the LoopSeries LB 430, an innovative, industry-leading measurement system designed to enhance operational efficiency with advanced level, density, and level switch capabilities.
Read more...Level measurement of a water sump at a sewage treatment plant
Level Measurement & Control
A major city council in South East Queensland, Australia maintains and operates a wastewater treatment plant (WWTP) for municipal, industrial and agricultural wastewater. Due to the risk of flooding, the water sump must be continuously monitored. The solution is KROHNE’s OPTIWAVE 1540 radar level transmitter.
Read more...Simplicity in measurement Endress+Hauser South Africa
Level Measurement & Control
Endress+Hauser’s new 80 GHz compact radar range is designed to help customers reach their compliance targets through simple yet efficient measurement solutions.
Read more...Case History 196: Unstable condensate level control. Michael Brown Control Engineering
Editor's Choice Level Measurement & Control
The operators in a petrochemical refinery were having great trouble in trying to stabilise the condensate level in a vessel, and this was adversely affecting other loops downstream. Several unsuccessful attempts had been made to retune the controller.
Read more...Level measurement in oil storage VEGA Controls SA
Level Measurement & Control
Measuring the level of crude oil in storage is essential for safe and efficient operations. VEGA offers solutions that effectively address the challenges, ensuring precise and consistent level measurements in crude oil storage facilities. VEGA’s sensors offer reliable data on the volume, level and pressure of all types of media. Accurate level measurement is complicated by crude oil thermal expansion properties, particularly in lighter oil grades.
printer friendly version