Tapered bore in-line indicators for flow rate. Ideal for high purity or corrosive liquid applications, gas and liquid applications, air samplers and medical applications. Flowmeters are shipped assembled and ready for panel mounting.
- How are Dwyer flowmeters properly read?
- The flow rate is read at the maximum width portion of the float regardless of shape.
- What factor is used to correct for different flowmeter inlet pressure?
- If the flowmeter is exhausting to atmosphere, no correction factor is needed. 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))
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)
- Why are top mounted valves recommended for flowmeters used for vacuum service?
- To maintain atmospheric pressure in the indicating bore and therefore preserve accuracy; an inlet restriction would reduce pressure in the bore. 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.
- Is the Rate-Master® or Visi-Float® Flowmeter compatible with any media?
- The Rate-Master® Flowmeter is manufactured from a polycarbonate plastic and the Visi-Float® Flowmeter is manufactured from acrylic. Compatibility charts need to be reviewed to determine if these materials of construction are compatible with your media.
- Are special ranges available for the Rate-Master® and/or Visi-Float® Flowmeter?
- Yes, other ranges are available which are not specified in our catalog. Please feel free to contact Dwyer with questions on these ranges.