KROHNE flowmeter combats corrosion

4th December 2002           
A-KRO105 - Draft 1

The problem of how to precisely measure highly corrosive electrolyte acid used to fill battery cells has been overcome using one of  the world?s most accurate flowmeters that also offers outstanding resistance to abrasion and corrosion ? KROHNE?s PROFIFLUX IFS 5000.

French based company Saft,  the market leader in Europe for the fabrication of rechargeable batteries for special applications in the automation, defence and aerospace industry, has been so impressed by the durability and accuracy of KROHNE?s PROFIFLUX IFS 5000 in its production process that it is considering installing more meters in similar applications.
Saft required a flowmeter for its production plant in Bordeaux that could  measure between 30 to 300cm3 of electrolyte, used to provide ionic conductivity between the positive and negative electrodes within each battery cell, with an accuracy of           +/- 2cm3. 
Saft has installed several PROFIFLUX IFS 5000?s with a diameter of 2.5mm and an IFC 090F converter as part of its automated battery production process.  The flowmeter generates pulses that are sent to a PLC, and when the desired volume of electrolyte is reached, the PLC closes the valves of the filling machine.
Electrolyte is a highly corrosive acid, and any leakage could be extremely hazardous, therefore Saft wanted a liner that guaranteed corrosion resistance.  KROHNE?s PROFIFLUX IFS 5000 provided the perfect solution with its fused aluminium oxide measuring tube and Cermet electrodes which are totally resistant to aggressive acids.   

Vital to the battery production process is the accuracy of the electrolyte batching measurement. The flow-optimising shape of the PROFIFIUX tube assures an accuracy of within 0.1% of the measured volume, while the smooth surface of the measuring tube also removes the risk of clogging.
Due to the limited space available in the location for Saft?s filling equipment, the flowmeter had to be compact to avoid problems and minimise installation costs.  The PROFIFLUX IFS 5000  has a small footprint which means installation is not a problem.
The PROFIFLUX IFS 5000 provides outstanding accuracy and repeatability and, with its tightly sealed electronic components, it is also extremely robust with excellent efficiency in harsh operating conditions.