Processing Magazine

CPVC flow transmitters for high temperature water and corrosives

December 15, 2008

Vortex shedding flow rate transmitters of chlorinated polyvinyl chloride (CPVC) allow for greater heat resistance in processing corrosive fluids, water, brine and low-viscosity fluids in water treatment, chemical and desalination applications. Universal Flow Monitors’ P420 Series of cost-effective plastic flowmeters now includes models with wetted parts entirely of either CPVC or PVC (polyvinyl chloride). The expanded product line provides a wider selection of inexpensive flow rate transmitters without moving parts that can stick, bind or coat when processing water or corrosives. With CPVC body, sensor and bluff can transmit hot water or other fluid with maximum operating temperature of 180 degrees F, compared to maximum 140 degrees F with PVC units. CPVC transmitters can accommodate higher maximum operating pressures than PVC units at temperatures of 80 to 180 degrees F. Universal Flow Monitors offers both CPVC and PVC units in five pipe diameters providing a flow range from 12 to 200 gallons per minute. The meters with CPVC wetted parts can transmit low-viscosity, PVC-compatible fluids that may contain particles. P420 Series CPVC and PVC transmitters are electronic instruments that, unlike mechanical switches, eliminate potential for clogging. P420 vortex shedding flow transmitters have no o-ring seals. Connection is made by either solvent welding the PVC or CPVC pipe into the socket port provided or by NPT threaded connection. Electronic output is from a 4-20 mA two-wire transmitter rated Intrinsically Safe when used with barriers. The electronics package is totally potted and not vulnerable to shorting, corrosion, leaks, humidity or condensate from conduits or thermal cycling.