Instruction manuals

The Bubbler System

Description
The Bubbler System is an inexpensive but accurate means of measuring the fluid level in open or vented containers, especially those in harsh environments such as cooling tower sumps, swimming pools, reservoirs, vented fuel tanks, drain sumps, air washers, etc. The system consists of a source of compressed air, air flow restrictor, sensing tube and pressure transmitter.
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  KELE ã www.kele.com ã FAX 901-372-2531USA901-937-4900 ã International 901-382-6084 January 2000  THE BUBBLER SYSTEM LIQUID LEVEL MEASUREMENT  DESCRIPTION The Bubbler System is an inexpensive but accuratemeans of measuring the fluid level in open or vented con-tainers, especially those in harsh environments such ascooling tower sumps, swimming pools, reservoirs, ventedfuel tanks, drain sumps, air washers, etc. The systemconsists of a source of compressed air, air flow restrictor,sensing tube and pressure transmitter. The only compo-nent of the Bubbler System that is exposed to the ele-ments is the sensing tube. All other components can beremotely located in a protected area. The sense tube is installed in the tank and connected tothe pressure transmitter and the air supply through theflow restrictor as shown in Figure#1. Since the pressure required to displace the liquid is determined by the depthof the fluid, the transmitter output indicates the fluid depthabove the open end of the sense tube. Note that it is notnecessary to extend the sense tube to the bottom of thecontainer if you are only interested in the fluid height inthe top part of the container. Using a shorter sense tubeand lower range pressure transmitter will improve theresolution and accuracy of the system. It may be necessary to install a check valve at the highpoint in the air line if the fluid level is above the air sup-ply and pressure transmitter. This may prevent siphoningof the fluid back to the transmitter and air compressor ifthere is a power failure. OPERATIONFigure 1 Acetic acid1.06Alcohol, commercial0.83Alcohol, pure0.79Ammonia0.89Benzine0.69Bromine2.97Carbolic acid0.96Carbon disulphide1.26Cotton-seed oil0.93Fluoric acid1.50Gasoline0.70Kerosene0.80Linseed oil0.94Mineral oil0.92Muriatic acid1.20Naphtha0.76Nitric acid1.50Olive oil0.92Palm oil0.97Petroleum oil0.82Phosphoric acid1.78Sulphuric acid1.84Tar1.00Turpentine oil0.87Vinegar1.08Water1.00Water, sea1.03 LiquidS.G.LiquidS.G.LiquidS.G. If the fluid is not water, use the following conversion formula to determine the maximum depth: See Ordering information for standard max. depthsSee S.G. in chart below Specific Gravity of Common Liquids  1 psi = 27.7 in. water = 2.31 ft. water = 2.04 in. Hg = 6.89 kPa KELE ã www.kele.com ã FAX 901-372-2531USA901-937-4900 ã International 901-382-6084 ORDERING INFORMATIONCONVERSION FACTOR PRESSURE TRANSMITTERManufacturerModelRangeMax. Depth (Water)ModusT30-1000 to 10 H 2 O10 Robinson-Halpern360C-P0150 to 1.5 psig41 Robinson-Halpern360C-P0300 to 3 psig82 Robinson-Halpern360C-P0600 to 6 psig166 Robinson-Halpern360C-P1101-10 psi277 The output of all pressure transmitters is 4-20 mAover the range indicated.CAUTION: It may be necessary to install a check valve at the high point in the air line if the fluid level is abovethe air supply and pressure transmitter. This should prevent siphoning of the fluid back to the transmitter and aircompressor if there is a power failure.
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