I am having trouble locating a pressure switch to mount on a bag filter system for zinc chloride. The temperature is 70 - 100 degrees F, 100% (or close to it) solution of zinc chloride. I need two contacts, one to alarm at 20psi and one to shut off the pump at 30psi. Also I need local indication and NEMA 4X enclosure. The problem is finding a pressure switch that is made of material compatible with zinc chloride. I have tried SOR, Turck, and United Electric but don't get a comfortable feeling from them. Does anyone have experience with filtering zinc chloride and using pressure switches with it? This is a duplex bag filter system, 7500gpm, mag-drive pump, skid mounted. Manufacturer of system will not install a pressure switch. Fred Chwalek Applications Engineer Beacon E-Commerce, eFilter Division Voice: (704) 398-7916 Fax: (704) 398-7822 Email: [email protected]

 

I don't recall zinc chloride as being particularly offensive and the corrosion chart I have shows 316SS or 304SS wetted parts would provide "excellant" corrosion resistance to a 10% zinc chlroide solution. Just about any full line instrument rep should be able to get you what you need. Try Lesman (www.lesman.com) if you don't know where else to start.

 

Use a diaphragm seal. It will isolate your product from the internal workings of the pressrue switch I don't know about your Material but you can get: All 316SS SS & Teflon or all plastic For Stainless http://wika.com/web/ProductInformation/03_PressureMeasurement/10_ChemicalSea l/ChemicalSeal_990.10_990.12_Features.html For Plastic http://www.plastomatic.com/ggme.html S. Landau SPEC

 

What about 100% or close to it solution% Fred Chwalek Applications Engineer Beacon E-Commerce, eFilter Division Voice: (704) 398-7916 Fax: (704) 398-7822 Email: [email protected]