RATE-MASTER® POLYCARBONATE FLOWMETERS

2˝, 5˝ or 10˝ Scale, Interchangeable Bodies

DWYER INSTRUMENTS, LLC | dwyer-inst.com

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The

Series RM Rate-Master® Polycarbonate Flowmeters are a line of general use,

direct reading precision flowmeters 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® flowmeter bodies can be instantly interchanged, allowing the piping to

remain undisturbed, interchangeability of the ranges, and easy cleaning.

BENEFITS/FEATURES

• Eliminate the need for troublesome conversions with direct reading scales

• Reduce installation damage and cost due to stainless steel backbone that absorbs

piping torque

• Long operation life with durable, shatter-proof polycarbonate body

• High repeatability enabled by precision injection molding around a precision

tapered pin

• Increased reading accuracy with special integral flow guides that stabilize float

movement

• Save time with instantaneous flow reading from scale graduations on both sides of

the indicating tube

APPLICATIONS

• Medical equipment

• Air samplers

• Gas analyzers

• Pollution monitors

• Chemical injectors

• Cabinet purging

A

B C

D

E

F

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K

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FULL OPEN

BACK

WIDTH

Model RMC

10˝ scale, 15-3/8˝ high

Model RMB-SSV

5˝ scale, 8-3/4˝ high

Model RMA-TMV

2˝ scale, 4-13/16˝ high

DIMENSIONS - FLOWMETER

Model RMA

Model RMB

Model RMC

A

B

C

D

E

F

G

H

I

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K

L

4-9/16 [115.90]

3 [76.20]

1/8 NPT conn.

1-5/8 [41.28]

10-32 mtg. holes

3/8 [9.525]

1-1/16 [26.99]

1-3/16 [30.16]

11/16 [17.46]

61/64 [24.21]

1-3/8 [34.92]

3/4 [19.05)

4-13/16 [122.20]

1 [25.40]

8-1/2 [215.90]

6-7/16 [163.50]

1/4 NPT conn.

3-15/16 [100.00]

1/4-20 mtg. holes

5/8 [15.88]

1-7/8 [47.63]

1-3/4 [44.45]

1 [25.40]

1-7/16 [36.51]

1-13/16 [46.04]

1-1/4 [31.75]

8-3/4 [222.30]

1-1/2 [38.10]

15-1/8 [384.20]

12-1/4 [311.20]

1/2 NPT conn.

8-3/4 [222.30]

3/8-24 mtg. holes

1 [25.40]

2-3/4 [69.85]

2-1/2 [63.50]

1-7/16 [36.51]

1-31/32 [50.00]

2-1/2 [63.50]

2 [50.80]

15-3/8 [390.50]

2-1/4 [57.15]

SERIES RM

VVIID

DEEO

O OONN

SPECIFICATIONS

Service: Compatible gases and liquids.

Wetted Materials: Body: Polycarbonate; O-ring: Neoprene and Buna-N; Metal

parts: SS; 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).

Compliance: 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.

CALIBRATION SERVICES AVAILABLE

USA: California Proposition 65

WARNING: This product can expose you to chemicals including Lead, which is known to the State

of California to cause cancer and birth defects or other reproductive harm. For more information go

to www.P65Warnings.ca.gov.