Product category:
Flowmeters and Flow Sensors
News Release from: Emerson Process Management - Rosemount Measurement | Subject: Rosemount Model 3300
Edited by the Engineeringtalk Editorial
Team on 23 April 2003
Guided wave radar solves liquid propane
problems
Because of surface turbulence, low dielectric constant and temperature variations, level measurement of liquid propane has historically been unreliable.
Liquid propane is used as a refrigerant in various industrial chemical plants: a standard process problem is monitoring the level of propane liquid in the accumulator tanks, to control the recirculation process and ensure the propane supply is not exhausted Because of surface turbulence, low dielectric constant and temperature variations in the liquid, level measurement has historically been unreliable in this application
This article was originally published on Engineeringtalk on 30 May 2000 at 8.00am (UK)
Related stories
Diaphragm seals match pressure transmitter
Fisher-Rosemount have invested in the design and development of a complete range of Diaphragm Seal Solutions, specifically to match the high specification 3051 transmitter.
Duplicated temperature monitoring in single unit
Fisher-Rosemount has introduced the latest version of the Model 3244MV Multivariable Temperature Transmitter to achieve duplicated temperature monitoring in one overall housing
Faced with this problem, engineers from Emerson Process Management applied the latest guided wave radar (GWR) based level measurement system, the Rosemount Model 3300.
This was felt to be more reliable technology for this application, because it has proved tolerant of liquid density changes and surface turbulence in other similar process vessels.
With GWR, the radar signal is sent down a probe, and one of the Rosemount standard probe designs is coaxial in construction, concentrating the measurement into a specific defined area, almost like a stilling well.
This increases the signal to noise ratio of the surface signal, when working with such low and variable dielectric fluids.
The test site had a probe length of 1.5m, and was installed through a flange on an existing process connection on the side of the tank.
The propane level was detected immediately, and the measurement system has made what are reported to be accurate measurements for several months.
The plant management regard this as a persistent problem that has now been eliminated.
The site instrument engineer was enthusiastic: "Emerson worked with us, presented a Rosemount radar solution, and now our control system can work as per design for the first time".
The Rosemount 3300 series radar level transmitter has the sensitivity to handle difficult interface measurement requirements, such as occur within tanks with boiling or agitated surfaces.
It is designed for monitoring and tracking both surface level, and interface levels, where two liquids separate into immiscible layers.
The enhanced sensitivity required for such interface measurement duties enables the Rosemount 3300 to perform where the interface to be detected is difficult to define.
• Emerson Process Management - Rosemount Measurement: contact details and other news
• Email this article to a colleague
• Register for the free Engineeringtalk email newsletter
• Engineeringtalk Home Page
Search the Pro-Talk network of sites
