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Last updateMon, 27 Aug 2018 3am

Reasons to Consider Using a 1000 ohm Platinum RTD

Technical Note by Moore Industries: When higher resolution is required, measuring circuits can benefit from the larger signal stren1000 ohm Platinum RTD.jpggth inherent to the 1000 ohm sensor available in Moore Industries products such as the WORM Flexible Temperature Sensor. This benefit can be seen in greater accuracy when used for smaller minimum measurement spans. Each point of measurement has 10 times more resistance along with a greater change in resistance per degree.

If your application involves wiring long distances from the RTD to the measuring device and you do not have a 4-wire RTD measuring circuit, you can benefit greatly by using the 1000 ohm sensor. The error caused by the wire resistance is dramatically reduced.  Assume your measuring device is measuring RTD + Wire. The Wire resistance is the same whether the RTD is 100 ohm or 1000 ohms. But when you compare (100 + Wire) to (1000 + Wire), the error caused by the Wire is roughly ten times less when using the 1000 ohm RTD.  When making a 3-wire RTD measurement with long wire runs, use the 1000 ohm to reduce your error.

Additional Resources and Recommended Readings by Moore Industries: SELECTION GUIDE: Temperature Sensors, Transmitters and Assemblies


Measuring Molasses Temperatures with the WORM

Moore Industries has published a new white paper on an application using the WORM Flexible Temperature Sensors to measure the temperature of molasses during the production of beet sugar. Using the WORM as a replacement for standard thermowells allows site engineers to get more accurate temperature readings and maximize the amount of sugar recovered from the molasses.

American Crystal Sugar Company struggled with getting accurate temperature readings of molasses created during the process of extracting beet sugar. The molasses ran about 1 1/2-inches thick at the bottom of a pipe. Using a standard straight thermowell and a solid sheathed RTD sensor meant that the thermowell and sensor was only partially submerged. This led to inaccurate temperature measurements.

This was solved by creating a custom thermowell from 3/8-in. Stainless steel tubing with a radial bend at the end. The flexible WORM RTD sensor was inserted and secured into the newly designed thermowell. This allowed the tip of the sensor to be angled so that it was fully submerged in the molasses. The result is that site operators are able to get highly accurate temperature readings, which allows them to adjust their processes to extract more sugar from the molasses.

Download White Paper

 

Rotork CVA delivers accurate pressure control for city’s water supply network

Rotork’s innovative CVA electric control valve actuators are enabling the Sydney Water Corporation in Australia to control the pressure in the city’s water supply network with greatly increased response and accuracy.

Water authorities need to control the supply pressure in their potable water pipeline networks throughout the day in response to user demand. Pipeline pressure also needs to be controlled to reduce network water leaks and to mitigate pipe bursts and consequential expensive repairs. To perform this vital function on the Sydney water supply network, Rotork Australia has supplied more than 150 Rotork CVL500 linear control valve actuators with adaptation for fitting to pilot valves.

Typically, spring pressure in a pilot valve is modulated over a short 1 – 4mm stroke; this controls the output of the pilot valve, which in turn controls the pipeline pressure. Network pressure can range from 15 metres to over 90 metres head. The characteristic of the Rotork CVL500 actuator enables very accurate control of the network in increments of 0.4 metres of head pressure. For the Sydney Water network this is an improvement on the previous coarse control resolution of up to 7 metres head, just by changing to the Rotork CVL500 actuator. Using a PID* control loop, the Rotork CVL500 provides repeatable and reliable ongoing pressure control.

The Rotork CVL500 actuator can operate in a flooded pit, as the enclosure is IP68 rated, whilst only low power 24V DC or 240V mains is needed. The CVL500 uses Bluetooth® to enable remote configuration and monitoring from outside the pit or confined space. With the integral manual override control the CVL500 allows operation with or without power by electrical and mechanical engineers as well as site operators.

The Rotork actuators were supplied to NetWorks Alliance, a collaboration formed by Sydney Water to deliver a programme aimed at reducing leaks and main breaks from the city’s 21,000 km water supply network. The Alliance provides integrated design-construction of renewals and other water and sewer works across Sydney Water’s area of operations.

Major Refinery uses Ultrasonic Fiscal Metering system

Case Study by Emerson: Reliance Industries Ltd., ranked 99th on the Fortune 500 list of the world’s major corporations, operates the largest refinery and petrochemical complex. Located in Jamnagar, Gujarat, India, this refinery processes 1.24 million bpd (MMbpd) of crude oil. Largely due to this facility, Jamnagar has emerged as one of the world’s refining hubs. This refinery features the world’s largest crude distillation, fluid catalytic cracking, delayed coking and paraxylene (PX) units. The complex involves the operation of 50 various processing units to produce PX, ethylene, polyethylene, polypropylene, transportation fuels (diesel, gasoline and aviation fuels), and many other products.

Refinery achieve greater measurement accuracy and ultra-reliability with new 3410/3810 Series Electronics that are now available with all Daniel Gas and Liquid Ultrasonic Flow Meters.  3410/3810 Series Electronics offer:

  • Speed: Enables operators to detect changing flow dynamics in real time before measurement is adversely affected.
  • Reliability: Less components and interconnections simplify troubleshooting and reduce maintenance time.
  • Stability: Maintains accuracy and repeatability over the life of the meter.
  • Ease of Use: Simplifies installation, configuration and ongoing maintenance of the meter.

Download complete Case Study

An Overview of Recent Changes to the Single/Dual Process Seal Standards

White Paper by Magnetrol: Over the years, well defined standards have been established to address the requirements for process sealing between electrical system and process fluids, where a failure could allow migration of fluid into the electrical system. The primary audience for this are the users of the process operators and facilities and installers of electrical system and instrumentation.

Download White paper