Sunday, January 21, 2018

Matching Temperature Sensor Type to Process Requirement

industrial temperature sensor thermocouple rtd transmitter
Temperature sensors and transmitters are available in
almost countless variants to accommodate every application.
Image courtesy Moore Industries
Temperature may be the most common measurement in process control operations. The measured value provides direct and inferential information about the energy content and operation of many processes.

For a wide array of temperature applications, getting a high level of accuracy is vital. For others, precision is not as important as ruggedness of the sensor, or cost, or some other criteria. Moore Industries brings vast experience in the design, manufacture and application of process temperature measurement to bear in the white paper included below. The condensed knowledge highlights how plant and site engineers can ensure  accurate temperature measurement for critical applications. Selecting the best sensor for a particular application and ways to improve the accuracy of the sensor you choose are also discussed. In particular, it details the reasons why 4-wire RTD sensors are almost always the best choice for high-accuracy temperature applications.

When facing temperature or other process measurement challenges, share your requirements with a process measurement and control specialist. Leverage your own knowledge and experience with their product application expertise to implement an effective solution.


Thursday, January 11, 2018

Dual Mode Thermometer Provides Independent Sensors for Local and Remote Readout


A dual mode thermometer incorporates two independent temperature sensors into a single thermowell. One sensor is part of the filled system of a bulb and capillary thermometer that delivers a local dial face readout for on-the-spot verification. The second sensor, an RTD or thermocouple, can be used locally, or combined with a transmitter to provide a process temperature signal at a remote location. Compact, convenient and accurate, the dual mode thermometer can easily replace an existing RTD, thermocouple or thermometer installed with a thermowell.

A broad range of configuration selections allows tailoring of the instrument to any application. Share your process measurement challenges with automation and instrumentation specialists, leveraging your own process knowledge and experience with their product application expertise.

Friday, January 5, 2018

Radar Level Transmitter Application

non-contact radar level transmitter in process tank
Radar level transmitters can be configured for non-contact
measurement of liquid levels.
Image courtesy Nivelco Process Control Co.
Radar is generally accepted to encompass means by which electromagnetic waves of short wavelength (microwaves) are used to detect the presence of, and distance to, a remotely located object. While the technology is probably best known for its use in miltary and air traffic control scenarios, radar ranging technology has also been put to industrial processing use in measuring the level of liquids and solids in containers of many types.

Very simply, a radar level measurement instrument emits a burst of electromagnetic energy and measures the time interval from its emission to return. The emitter directs the microwaves toward the surface of the material to be measured. As the distance from the emitter to the material increases, so does the transit time of the wave on its round trip from emitter to media surface and back to a detector antenna. This transit time is proportional to the distance from the emitter to the media surface and can be used to calculate the media level.

Radar level transmitters can provide onboard processing of the raw signal, delivering a standard industrial process control signal which is scaled to a useful value range indicating percentage of tank fill, or some other useful representation of media level.

Radar level technology is utilized in a guided wave format, where the emitted energy travels down a tube extending into the medium, and non-contact configurations with the microwave emissions dispersing as they travel from the source antenna. Both types deliver excellent accuracy and have their specific application criteria where they may be preferred.

Properly selecting and applying level measurement instrumentation requires consideration of many operational and technological aspects of each process. Share your process measurement challenges with application specialists and leverage your own knowledge and experience with their product application expertise.