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Siemens Air Bubbler Systems for Liquid Level Measurement

• A small amount of air is metered into a dip tube in the tank
• A pressure transducer monitors the air pressure in the tube
• The pressure in the tube equals the pressure at the tank's bottom.
• The liquid level equals the pressure inside the tube divided by the liquid's density
• As long as the material density remains constant, the pressure is directly proportional to the liquid level in the tank
• Let Lesman build you a Siemens air bubbler system to your specification.
  Call 800-953-7626 and talk to our application specialist.
   
• Click here to view our full offering of Siemens (Milltronics) level instrumentation

A bubbler system in an inexpensive yet accurate way to measure the fluid level in open or vented containers, especially those in harsh environments, such as cooling tower sumps, reservoirs, vented fuel tanks, drain sumps, or air washers. A complete bubbler level measurement system consists of a source of compressed air, an air flow restrictor, sensing tube, and pressure transmitter.

Air bubbler systems contain no moving parts, making them suitable for measuring the level of water, viscous fluids, liquids with large quantities of suspended solids, slurries, sewage, drainage water and sludge. The only part of the sensor that contacts the liquid is a dip tube which is chemically compatible with the material whose level is to be measured. Since the point of measurement has no electrical components, the technique is a good choice for most fluids and especially good for fluids classified as hazardous. What makes the bubbler more safe is that the bubbler controls are located outside the tank in a separate enclosure with only the pneumatic plumbing running to the tank, isolating the hazardous from the safe area.

Supporting Documentation
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Type	Description	Size
	Lesman Catalog Section: Level Measurement and Control Instruments	4.5MB
	Siemens 101: Theory of Air Bubblers for Liquid Level Measurement	195KB
	Siemens SITRANS P DS-III Transmitter Series Specification Catalog	1.6MB
	Siemens SITRANS P DS-III Pressure Transmitters User Manual	8.9MB
	Siemens Series 62 Constant-Differential Relay Specification Catalog	64KB
	Siemens Series 62 Constant-Differential Relay User Manual	652KB
	Siemens 91-HF Combination Filter-Regulator Specification Catalog	51KB
	Siemens 91-HF Combination Filter-Regulator User Manual	157KB

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Last Ed. Date: 01/13/2012 03:33 PM