QUESTIONWhat factor is used to correct for different flowmeter inlet pressure? ANSWER If the flowmeter is exhausting to atmosphere, no correction factor is needed.
Jan 4, 2014 - 13.3 AVERAGING PITOT TUBE FLOW MEASUREMENT. And 2 sets in editable software like Microsoft Excel / AUTOCAD only. A pitot tube can also be used if the vibration range is well below the anticipated operating flow range. The process flowrate can pass through the vibration range, but the flow should not be allowed to remain within the vibration range continuously. The equations below yield the flowrate range which must be avoided when selecting a pitot tube.
If back-pressure is present due to downstream plumbing or restrictions, this error can be corrected utilizing the conversion curves in our full-line catalog or the following equation. Pressure: Q2 = Q1 x √((P1 x T2)/(P2 x T1)) Where: Q1 = Observed Flowmeter Reading Q2 = Standard Flow Corrected for Specific Gravity P1 = Actual Pressure (14.7 psia + Gage Pressure) P2 = Standard Pressure (14.7 psia, which is 0 psig) T1 = Actual Temperature (460 R + Temp °F) T2 = Standard Temperature (530 R, which is 70°F) RELATED PRODUCTS. QUESTIONWhy are top mounted valves recommended for flowmeters used for vacuum service? ANSWER To maintain atmospheric pressure in the indicating bore and therefore preserve accuracy; an inlet restriction would reduce pressure in the bore. Download free dashboard dusk and summer zip robes. This is essentially the opposite situation to outlet back-pressure in a pressure system which increases pressure in the bore and also affects accuracy.
Remember that all standard Dwyer flowmeters are calibrated for standard atmospheric pressure and temperature in the bore. RELATED PRODUCTS. QUESTIONHi-Flow™ control valves call out ANSI B16.104 Class IV flow leakage. What does this mean? ANSWER ANSI B16.104 is a testing specification for control valves. This specification has actually been superseded by ANSI/FCI 70-2 Class IV.
The class IV designation defines the allowable amount of leakage through the valve seat in the closed position. Class IV allows for.01 percent of the rated flow (Cv), to pass through the seat. Class IV is common for metal to metal seated valves. RELATED PRODUCTS. QUESTIONWhat if I need parts for my Hi-Flow™ control valve? ANSWER Many Hi-Flow™ valves have been in service for 15+ years with all original parts. However, since Hi-Flow™ valves are commonly used in steam service, a severe application, some parts may wear over time.
Unlike other control valves, Hi-Flow™ valves are designed with removable seat rings making repair or replacement of components an option. Although all parts are available, you will probably never need more than a seat ring, plug assembly, and stem packing to have a valve that is like new. RELATED PRODUCTS. QUESTIONWhat are the two dry product level switch model types?
What ranges do they cover? How are they adjusted? How many set-points do they have?
ANSWER GSD3DA - gravity (elastomer) suspension, aluminum housing, polyurethane diaphragm, standard 15 amp switch. PSD16A - pneumatic (fabric), suspension, aluminum housing, filter fabric diaphragm, polyester 150 micron permeability, standard 15 amp switch. They can be adjusted to any level. They are adjusted by a screw adjustment.
One setpoint available. For additional options, you could look at our CLS2 Series Capacitive Level Switch, TFLS Series Tuning Fork Level Switch, PLS and PLS2 Series Paddle Level Switches. RELATED PRODUCTS. QUESTIONWhat is the advantage of using a manometer rather than a Magnehelic® gage?
ANSWER Dwyer Instruments manufactures many different types and styles of manometers with various accuracies and prices for different applications as well as the Magnehelic® gage. For example, some of the many manometers we manufacture are Hook Gage Manometers with ±0.001 inches water column accuracy; Microtector® Portable Electronic Point Gage to ±0.00025 inches water column accuracy; Handheld Digital Manometers with ±0.5 inches water column accuracy; very inexpensive Mark II Molded Plastic Air Filter Gages at ±3% inches water column accuracy.