Series RM Rate-Master® Polycarbonate Flowmeter

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

The SERIES RM Rate-Master® 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.

DID YOU KNOW that you can add YOUR logo to our Rate-Master® Flowmeter, call customer service for details.

California Residents:  Click Here for Proposition 65 WARNING.

Product Applications

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

Models & Ordering

Filter By

Build Your Custom Part. Use our Product Configurator

Model Description Usually Ships Price Order
RMA-1
Ships: Same Day
Price: $34.75
Flowmeter, range .05-.4 SCFH air, no valve. Same Day $34.75 Order
RMA-10
Ships: Same Day
Price: $34.75
Flowmeter, range 20-200 SCFH air, no valve. Same Day $34.75 Order
RMA-11
Ships: Same Day
Price: $34.75
Flowmeter, range 30-200 cc/min air, no valve. Same Day $34.75 Order
RMA-12
Ships: Same Day
Price: $34.75
Flowmeter, range 50-500 cc/min air, no valve. Same Day $34.75 Order
RMA-13
Ships: Same Day
Price: $34.75
Flowmeter, range 100-1000 cc/min air, no valve. Same Day $34.75 Order
RMA-14
Ships: Same Day
Price: $34.75
Flowmeter, range 200-2500 cc/min air, no valve. Same Day $34.75 Order
RMA-150
Ships: Same Day
Price: $51.75
Flowmeter, range 10-100 cc/min air, no valve. ±8% accuracy. Same Day $51.75 Order
RMA-151
Ships: Same Day
Price: $51.75
Flowmeter, range 5-50 cc/min air, no valve. ±8% accuracy. Same Day $51.75 Order
RMA-2
Ships: Same Day
Price: $34.75
Flowmeter, range .1-1 SCFH air, no valve. Same Day $34.75 Order
RMA-21
Ships: Same Day
Price: $34.75
Flowmeter, range 1-10 LPM air, no valve. Same Day $34.75 Order
RMA-22
Ships: Same Day
Price: $34.75
Flowmeter, range 2-25 LPM air, no valve. Same Day $34.75 Order
RMA-23
Ships: Same Day
Price: $34.75
Flowmeter, range 5-50 LPM air, no valve. Same Day $34.75 Order
RMA-24
Ships: Same Day
Price: $34.75
Flowmeter, range 5-70 LPM air, no valve. Same Day $34.75 Order
RMA-25
Ships: Same Day
Price: $34.75
Flowmeter, range 10-100 LPM air, no valve. Same Day $34.75 Order
RMA-26
Ships: Same Day
Price: $34.75
Flowmeter, range .5-5 LPM air, no valve. Same Day $34.75 Order
RMA-3
Ships: Same Day
Price: $34.75
Flowmeter, range.2-2 SCFH air, no valve. Same Day $34.75 Order
RMA-32
Ships: Same Day
Price: $34.75
Flowmeter, range 5-50 cc/min water, no valve. Same Day $34.75 Order
RMA-33
Ships: Same Day
Price: $34.75
Flowmeter, range 10-110 cc/min water, no valve. Same Day $34.75 Order
RMA-34
Ships: Same Day
Price: $34.75
Flowmeter, range 20-300 cc/min water, no valve. Same Day $34.75 Order
RMA-4
Ships: Same Day
Price: $34.75
Flowmeter, range .5-5 SCFH air, no valve. Same Day $34.75 Order
RMA-42
Ships: Same Day
Price: $34.75
Flowmeter, range 1-11 GPH water, no valve. Same Day $34.75 Order
RMA-43
Ships: Same Day
Price: $34.75
Flowmeter, range 2-24 GPH water, no valve. Same Day $34.75 Order
RMA-44
Ships: 1-2 Weeks
Price: $34.75
Flowmeter, range 4-34 GPH water, no valve. 1-2 Weeks $34.75 Order
RMA-45
Ships: Same Day
Price: $34.75
Flowmeter, range 5-50 GPH water, no valve. Same Day $34.75 Order
RMA-5
Ships: Same Day
Price: $34.75
Flowmeter, range 1-10 SCFH air, no valve. Same Day $34.75 Order
RMA-6
Ships: Same Day
Price: $34.75
Flowmeter, range 2-20 SCFH air, no valve. Same Day $34.75 Order
RMA-7
Ships: Same Day
Price: $34.75
Flowmeter, range 5-50 SCFH air, no valve. Same Day $34.75 Order
RMA-8
Ships: Same Day
Price: $34.75
Flowmeter, range 10-100 SCFH air, no valve. Same Day $34.75 Order
RMA-9
Ships: Same Day
Price: $34.75
Flowmeter, range 15-150 SCFH air, no valve. Same Day $34.75 Order

Can't find what you need? Build Your Custom Part. Use our Product Configurator

Specifications

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.

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

Options

  • Top Mounted Metering Valves - Same precision construction for vacuum applications RMA models only.
  • Adjustable Pointer Flags - Red lined pointer flags provide quick visual reference to a required flow level. Of clear plastic, they snap into place inside bezel and slide to desired level.
  • Specials - Special ranges, scales, mounting arrangements, etc., are available on special order, or in OEM quantities.

Accessories

Model Number Description Usually Ships Price Order
Regulator kit for RMA or VFA. RKA Regulator kit for RMA or VFA. Same Day $217.00 Order
Regulator kit for RMB. RK-RMB Regulator kit for RMB. Same Day $217.00 Order
Optional pointer flag, for RMA flowmeter. 100042-00 Optional pointer flag, for RMA flowmeter. Same Day $6.20 Order
Optional pointer flag, for RMB flowmeter. 100043-00 Optional pointer flag, for RMB flowmeter. Same Day $6.50 Order
Optional pointer flag, for RMC flowmeter. 100044-00 Optional pointer flag, for RMC flowmeter. Same Day $6.50 Order

Videos

Model Chart

Series RMA - 2" Scale

EXAMPLE RMA 1 APF Series RMA-1-APF Rate-Master® Flowmeter, 2" Scale, range .05-.5 SCFH air, with adjustable pointer flag.
SERIES RMA     Rate-Master® Flowmeter, 2" Scale
RANGE   1
2
3
4
5
6
7
8
9
10
151
150
11
12
13
14
15
16
26
21
22
23
24
25
32
33
34
42
43
44
45
  .05-.5 SCFH Air
.1-1 SCFH Air
.2-2 SCFH Air
.5-5 SCFH Air
1-10 SCFH Air
2-20 SCFH Air
5-50 SCFH Air
10-100 SCFH Air
15-150 SCFH Air
20-200 SCFH Air
5-50 cc/min Air
10-100 cc/min Air
30-240 cc/min Air
50-500 cc/min Air
100-1000 cc/min Air
200-2500 cc/min Air
400-5000 cc/min Air
1000-10000 cc/min Air
.5-5 LPM Air
1-10 LPM Air
2- 25 LPM Air
5-50 LPM Air
5-70 LPM Air
10-100 LPM Air
5-50 cc/min Water
10-110 cc/min Water
20-300 cc/min Water
1-11 GPH Water
2-24 GPH Water
4-34 GPH Water
5-50 GPH Water
OPTIONS     APF
ARB
AT
BO
BOV
BV
NIST
SPCL
SSV
TMV
VIT
WL
Adjustable Pointer Flag
Arbitrary Scale (no units)
Aluminum Tag
Body Only
Body Only Valve Unit
Brass Valve
NIST Traceable Calibration Certificate
Special Cleaning
Stainless Steel Valve
Top Mounted Valve
Fluoroelastomer O-rings
Without Logo


Series RMB - 5" Scale

EXAMPLE RMB 49 BPF Series RMB-49-BPF Rate-Master® Flowmeter, 5" Scale, range .5-5 SCFH air, with adjustable pointer flag.
SERIES RMB     Rate-Master® Flowmeter, 5 " Scale
RANGE   49
50
51
52
53
54
55
56
57
82
83
84
85
50D
51D
52D
53D
54D
82D
83D
85D
  .5-5 SCFH Air
1-10 SCFH Air
2-20 SCFH Air
5-50 SCFH Air
10-100 SCFH Air
20-200 SCFH Air
40-400 SCFH Air
50-500 SCFH Air
60-600 SCFH Air
1-12 GPH Water
1-20 GPH Water
4-40 GPH Water
10-100 GPH Water
1.2-10 SCFH & 0.6-5 LPM Air
3-20 SCFH & 1.5-9.5 LPM Air
4-50 SCFH & 2-23 LPM Air
10-100 SCFH & 5-50 LPM Air
20-200 SCFH & 10-95 LPM Air
1-12 GPH & 0.06-0.76 LPM Water
1-20 GPH & 0.065-1.25 LPM Water
10-100 GPH & 0.5-6.2 LPM Water
OPTIONS     ARB
AT
BO
BOV
BPF
BV
NIST
SPCL
SSV
VIT
WL
Arbitrary Scale (no units)
Aluminum Tag
Body Only
Body Only Valve Unit
Adjustable Pointer Flag
Brass Valve
NIST Traceable Calibration Certificate
Special Cleaning
Stainless Steel Valve
Fluoroelastomer O-rings
Without Logo


Series RMC - 10" Scale

EXAMPLE RMC 101 CPF Series RMC-101-CPF Rate-Master® Flowmeter, 10" scale, range 5-50 SCFH air, with adjustable pointer flag.
SERIES RMC     Rate-Master® Flowmeter, 10" Scale
RANGE   101
102
103
104
105
106
107
108
121
122
123
134
135
141
142
143
144
145
  5-50 SCFH Air
10-100 SCFH Air
20-200 SCFH Air
40-400 SCFH Air
60-600 SCFH Air
100-1000 SCFH Air
120-1200 SCFH Air
200-1800 SCFH Air
1-10 SCFM Air
2-20 SCFM Air
3-30 SCFM Air
2-20 GPH Water
8-90 GPH Water
.1-1 GPM Water
.2-2.2 GPM Water
.4-4 GPM Water
.8-7 GPM Water
1.2-10 GPM Water
OPTIONS     ARB
AT
BO
BOV
BV
NIST
CPF
SPCL
SSV
VIT
WL
Arbitrary Scale (no units)
Aluminum Tag
Body Only
Body Only Valve Unit
Brass Valve
NIST Traceable Calibration Certificate
Adjustable Pointer Flag
Special Cleaning
Stainless Steel Valve
Fluoroelastomer O-rings
Without Logo

Product Literature

Manuals

Catalog Pages

Product Data Sheet

Approvals

Drawings

Questions

Question
How are Dwyer flowmeters properly read?
Answer
The flow rate is read at the maximum width portion of the float regardless of shape.
Question
I am looking to use an "Air" flowmeter RMA-6-SSV to monitor CO2 flow. I am wondering if there are are any concerns or correction factors I need to apply.
Answer
A specific gravity correction factor will need to be considered when monitoring other gases with a meter calibrated for air. The correction factor equation is as follows: Q2=Q1 x sqrt (1/S.G.) Where: Q1= Observed Flowmeter reading Q2= Standard Flow Corrected for Specific Gravity 1= Specific Gravity of Air or Water S.G.= Specific Gravity of media being used in flowmeter originally calibrated for air or water.
This equation can be found in the beginning of the Flow section in the catalog. Alternatively, special ranges and scales can be provided; for specific information please contact our customer service department.
For further information, see our "Tech & Specs" Video Blog: Fix your Flow... Specific Gravity and Pressure Corrections for Variable Area Flowmeters (Episode 4), in Dwyer's Video Library.
Question
Instruction Sheet specs on RM series flowmeters list 100 PSI max pressure, but have seen several RMC flowmeter labels with 35 PSI max pressure rating. Some clarification on pressure ratings please? Thank you.
Answer
The older version of the RMC used to have a pressure limit of 35psi because the backplate was assembled from 2 seperate pieces. The pressure rating increased to 100psi when we began to stamp the backplate from 1 solid piece.
Question
Where is the date code or lot number located on the flowmeter Model RMA-3-SSV?
Answer
The date code is on the label.
Question
Are your flowmeters (particularly the brass body models) RoHS compliant? Can you provide a statement to that effect?
Answer
You can find the RoHS Compliance letter in the tab marked APPROVALS on RM Series.
Question
For the VFA-44-BV product, what is the minimum flow that I can reliably control with a pressure head of up to 4 bar? Will the needle valve function properly at that pressure/flow combination? Thank you.
Answer
At a pressure of 4 bar (58 psi), the needle valve should function properly and provide reliable control over the whole range, which is 8-40 gallons of water per hour.
Question
Is a Dwyer Certificate of Conformance offered with any of the flowmeter models?
Answer
A standard Dwyer Certificate of Conformance can be offered with all Dwyer Mini-Master®, Rate-Master®, and Visi-Float® flowmeters on all water ranges (or other compatible liquids).
Question
Are special ranges available for the Rate-Master® and/or Visi-Float® Flowmeter?
Answer
Yes, other ranges are available which are not specified in our catalog. Please feel free to contact Dwyer with questions on these ranges.
Question
Is the Rate-Master® or Visi-Float® Flowmeter compatible with any media?
Answer
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.
Question
Why 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. 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.
Question
What factor is used to correct for different flowmeter inlet pressure?
Answer
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))

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)
Question
What is the calibration frequency, if required, for a RMB flowmeter?
Answer
Calibration frequency would be once a year if necessary. We offer a NIST calibration certificate which expires in one year. Contact Customer Service at 800-872-9141 Ext. 656 for current cost.
Question
Which flowmeters are available with NIST traceability?
Answer
All Dwyer Mini-Master®, Rate-Master®, and Visi-Float® flowmeters are available with NIST traceability on all air ranges except for RMA-1, RMA-11, RMA-150, RMA-151, VFA-1, VFA-21 and VFB-60 models.

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