Series RM Variable Area Rate-Master® Polycarbonate Flow Meter

Dwyer RM Series Variable Area Rate-Master® Polycarbonate Flow Meter

Dwyer RM Series Variable Area Rate-Master® Polycarbonate Flow Meter are a line of general use, direct reading precision flow meters suitable for both gas and liquid applications. This Series consists of 2″ (51 mm), 5″ (127 mm) and 10″ (254 mm) scales that can be panel or surface mounted with optional precision metering valves.

Within a given Series, the Rate-Master® flow meter bodies can be instantly interchanged, allowing the piping to remain undisturbed, interchangeability of the ranges, and easy cleaning.

Dwyer RM Series Features

  • Direct reading scales eliminate the need for troublesome conversions
  • Stainless steel backbone absorbs piping torque reducing installation damage and cost
  • Shatter-proof polycarbonate allows for long operation life
  • Precision injection molding around a precision tapered pin enables high repeatability
  • Increased reading accuracy with special integral flow guides that stabilize float movement
  • Scale graduations on both side of the indicating tube allow for instantaneous flow reading saving time


  • Medical equipment
  • Air samplers
  • Gas analyzers
  • Pollution monitors
  • Chemical injectors
  • Cabinet purging
Another Article:

Dwyer RM Series Specification

Service Compatible gases and liquids.
Wetted Materials Body: Polycarbonate; O-ring: Neoprene and Buna-N; Metal parts: SS (except for optional brass valve); Float: SS, black glass, aluminum, K monel, tungsten carbide depending on range.
Temperature Limit 130°F (54°C).
Pressure Limit 100 psi (6.9 bar).
Accuracy RMA: 4%; RMB: 3%; RMC: 2% of FS.
Process Connection RMA: 1/8″; RMB: 1/4″; RMC: 1/2″ female NPT.
Weight RMA: 4 oz (113.4 g); RMB: 13 oz (368.5 g); RMC: 39 oz (1105.6 g).
Agency Approvals Meets the technical requirements of EU Directive 2011/65/EU (RoHS II).
Caution Dwyer® Rate-Master® flowmeters are designed to provide satisfactory long term service when used with air, water, or other compatible media. Refer to factory for information on questionable gases or liquids. Caustic solutions, anti-freeze (ethylene glycol) and aromatic solvents should definitely not be used.

Download Data Sheet: Series RM Variable Area Rate-Master® Polycarbonate Flow Meter