Float-blocking indicator added to RAMC flowmeter
A
Yokogawa product story
Edited by the Engineeringtalk editorial team
Jan 29, 2009
Yokogawa has developed a float-blocking indication system for the RAMC flowmeter that automatically detects any problems with the free movement of the float.
Flowmeters based on the rotating-float principle offer the benefits of simplicity, minimal energy consumption and robustness.
However, foreign particles in the medium being measured can cause the float to jam.
In modern flowmeters, the float rises and falls inside a metal tube, with the float position transmitted by magnetic coupling to the indicator.
Although this leads to a more robust instrument, it becomes inherently more difficult to check the working condition of the flowmeter.
The float-blocking indication system is based on the fact that the float oscillates slightly when there is a flow.
Software is incorporated in the transmitter to detect whether this basic movement is present.
If the oscillation is absent, the software triggers an error signal and the output current is adjusted to fault-current level.
Remote diagnostics then indicate that the instrument is no longer working correctly.
The Yokogawa Rotameter Series RAMC and RAKD flowmeters are housed in stainless steel 1.4301 enclosures, with the casting sealed to IP protection class IP66/67.
Hazardous area approvals are available for the instruments, including Atex, FM, SAA and Nepsi.
The RAMC also complies with the SIL1 and SIL2 requirements.
In addition to providing a 4-20mA analogue signal for flow indication, minimum and maximum switching signals are available.
Hart and Profibus PA are also available as interfaces for digital communication.
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