04262019Fri
Last updateMon, 27 Aug 2018 3am

pH/ORP Measurement for Reverse Osmosis

Reverse osmosis (RO) is a separation process that uses pressure to force a solution through a membrane that retains the solute on one side and allows the pure solvent to pass to the other side. More formally, it is the process of forcing a solvent from a region of high solute concentration through a membrane to a region of low solute concentration by applying a pressure in excess of the osmotic pressure. To illustrate, imagine a semipermeable membrane with fresh water on one side and a concentrated aqueous solution on the other side. If normal osmosis takes place, the fresh water will cross the membrane to dilute the concentrated solution. In reverse osmosis, pressure is exerted on the side with the concentrated solution to force the water molecules across the membrane to the fresh water side.

Read full Application Note by Yokogawa


Working with Self-powered and Loop-powered Sensors

Quick, suppose you need to monitor sensors with a milliamp current signal. Should you get a SNAP-AIMA, a SNAP-AIMA-i, or a SNAP-AIMA-iSRC analog input module? Or what about a SNAP-AIMA-4 or a SNAP-AIMA-32?

All of these modules provide -20 mA to +20 mA analog current input connections. So which one do you need?

Read this article in full by Opto22

Yokogawa Flowmeters installed in the State-of-the-art Water Reclamation Plant in Singapore

Case Study by Yokogawa: The Deep Tunnel Sewerage System (DTSS) is an efficient and cost-efficient solution to meet Singapore’s long-term needs for used water collection, treatment, reclamation and disposal. Conceptualised and managed by Public Utilities Board (PUB), Singapore’s national water agency, it was conceived as a cost-effective and sustainable solution to meet Singapore’s long-term used water needs.

One of the key challenges was field device management through PROFIBUS. PROFIBUS incorporates the field device tool/device type manager (FDT/DTM) technology, which enables the monitoring of measured data and the configuration of devices from the operator stations in a central control room. With these requirements in mind, the devices installed in the DTSS were all designed to the PROFIBUS specifications.

To read the Case Study in details click 'Yokogawa Flowmeters installed in Water Reclamation Plant in Singapore'

Rotork IQ3 intelligent valve actuators specified for strategic gas pipeline

The third stage of the massive West-East Gas Pipeline Project (WEPP) in China will utilise the latest Rotork IQ3 intelligent electric actuators for valve control at compressor stations, manifolds and storage facilities.

During the past decade, thousands of Rotork IQ intelligent electric valve actuators have been installed on stages one and two of the 4000 kilometre long West-East Gas Pipeline network that runs through sixty-six counties in the ten provinces of China. The first stage of this huge undertaking, which opened in 2004, brings natural gas from the Tarim Basin gas fields in Xinjiang to the Yangtze River Delta area for the production of electricity.

In 2008 construction began on a second pipeline, in part running parallel to and interconnected with the first. The second pipeline runs from Xinjiang to Guangzhou and is being followed by two further pipeline developments, all designed to supply billions of cubic metres of gas to satisfy the burgeoning demand for energy in China’s industrial and population centres.

With construction of the third stage now underway, Rotork is beginning to fulfil orders with IQ3 intelligent electric actuators. Launched in 2012, the IQ3 is designed to dovetail seamlessly into existing IQ actuator installations and control protocols, whilst introducing new levels of functionality and asset management abilities, combined with further refinements to a well-proven and rugged mechanical design.

The large toughened glass wide angle indication window is the focus of attention for non-intrusive two way wireless communication and multi-functional indication. An LCD segment display provides positional and warning icon information, whilst actuator setup and operating menus along with detailed diagnostic and operational data screens are clearly displayed in dot matrix format. Diagnostic graphics present a window into the process, showing the valve torque and usage profiles along with service logs, facilitating real time analysis directly at the actuator.

Data Acquisition Handbook - Download your Free Handbook

The third edition of the Data Acquisition Handbook from Measurement Computing is available for download and has been enhanced to address more practical applications than theoretical measurement issues. Each chapter covers a major topic with sufficient detail to help readers understand the basic principles of sensor operation and the need for careful system interconnections.

The handbook also discusses key issues concerning the data acquisition system’s multiplexing and signal conditioning circuits, and analog-to-digital converters. This popular handbook has also been used by teaching professionals for the instruction of sensor-based measurement techniques.

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