Dwyer Series RM Rate-Master® Flowmeter
Polycarbonate, Gas Flow from .1-1800 SCFH, Water Flows to 10 GPM The Dwyer Rate-Master® line of direct reading precision flowmeters incorporates many unique user features at moderate cost. These low cost flowmeters are ideal for use to measure flow of air & water as well as other compatible gases& fluids. We can provide a suitable pressure regulator for these Dwyer flowmeters.
Easy to read design - The direct reading scales eliminate troublesome conversions. The scales are brushed aluminum, coated with epoxy and the graduations are on both sides of the indicating tube. Special integral flow guides stabilize the float throughout the range to keep it from hunting or wandering in the bore. The float is highly visible against a white background.
Construction assures accuracy - All Rate-Master® flowmeter bodies are injection molded of tough, clear, shatter-proof polycarbonate plastic around a precision tapered pin. The result is accurate and repeatable readings. The single piece plastic body is mounted to a stainless steel back bone into which pipe thread inserts are welded to absorb piping torque. Precision metering valves of brass or stainless steel (specify BV or SSV on order) are available as an optional extra and permit precise flow adjustments. For vacuum applications, Model RMA units are available with top mounted valves (specify TMV). The small Series RMA models are accurate within ±4% of full scale reading; Series RMB within ±3%; large Series RMC within ±2%.
Installation is simple - The Rate-Master® can be neatly through - panel mounted to keep flow tube centers in the same plane as the panel surface or surface mounted on the panel by means of tapped holes in the backbone. When through-panel mounted, the bezel automatically positions the instrument at the correct depth in the panel cutout. Surface mounted units can also be held in place by the piping. All mounting hardware plus installation and operating instructions are included.
Easy-to-Interchange bodies - Within a given Series Rate-Master® flowmeter bodies can be instantly interchanged. Simply "unplug" the body from backbone and replace it with another. "O" rings provide a tight seal on inlet and outlet. Piping remains undisturbed. Interchangeability is useful where different scale ranges are sometimes required at the same location in the laboratory or plant.
Cleaning is easy - To release the plastic flowmeter body from the stainless steel backbone, just remove four screws. Pipe thread flow connections remain undisturbed. Remove the slide cover and the plug ball stop, clean the flow tube with soap and water and reassemble. It’s that simple.
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Flowmeter SPECIFICATIONS
Service: Compatible gases and liquids.
Wetted Materials: Body: Polycarbonate; O-ring: Neoprene & Buna-N; Metal Parts: Stainless steel (except for optional brass valve); Float: Stainless steel, 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 full scale.
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).
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.
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.
Flow meter FEATURES:Specials - Special ranges, scales, mounting arrangements, etc. are available on special order, or in OEM quantities.
AVAILABLE RMA flowmeter MODELS:
Series RMA Rate-Master® Flowmeter (2" scale)Model Number | Range | RMA-1 | .05-.5 scfh Air | RMA-2 | .1-1 scfh Air | RMA-3 | .2-2 scfh Air | RMA-4 | .5-5 scfh Air | RMA-5 | 1-10 scfh Air | RMA-6 | 2-20 scfh Air | RMA-7 | 5-50 scfh Air | RMA-8 | 10-100 scfh Air | RMA-9 | 15-150 scfh Air | RMA-10 | 20-200 scfh Air | RMA-151 | 5-50 cc/min Air | RMA-150 | 10-100 cc/min Air | RMA-11 | 30-240 cc/min Air | RMA-12 | 50-500 cc/min Air | RMA-13 | 100-1000 cc/min Air |
| Model Number | Range | RMA-14 | 200-2500 cc/min Air | RMA-26 | .5-5 l/min Air | RMA-21 | 1-10 l/min Air | RMA-22 | 2-25 l/min Air | RMA-23 | 5-50 l/min Air | RMA-24 | 5-70 l/min Air | RMA-25 | 10-100 l/min Air | RMA-32 | 5-50 cc/min Water | RMA-33 | 10-110 cc/min Water | RMA-34 | 20-300 cc/min Water | RMA-42 | 1-11 GPH Water | RMA-43 | 2-24 GPH Water | RMA-44 | 4-34 GPH Water | RMA-45 | 5-50 GPH Water |
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Series RMA Rate-Master® Flowmeter (2" scale) - Brass ValveModel Number | Range | RMA-1-BV | .05-.5 scfh Air | RMA-2-BV | .1-1 scfh Air | RMA-3-BV | .2-2 scfh Air | RMA-4-BV | .5-5 scfh Air | RMA-5-BV | 1-10 scfh Air | RMA-6-BV | 2-20 scfh Air | RMA-7-BV | 5-50 scfh Air | RMA-8-BV | 10-100 scfh Air | RMA-9-BV | 15-150 scfh Air | RMA-10-BV | 20-200 scfh Air | RMA-151-BV | 5-50 cc/min Air | RMA-150-BV | 10-100 cc/min Air | RMA-11-BV | 30-240 cc/min Air | RMA-12-BV | 50-500 cc/min Air | RMA-13-BV | 100-1000 cc/min Air |
| Model Number | Range | RMA-14-BV | 200-2500 cc/min Air | RMA-26-BV | .5-5 l/min Air | RMA-21-BV | 1-10 l/min Air | RMA-22-BV | 2-25 l/min Air | RMA-23-BV | 5-50 l/min Air | RMA-24-BV | 5-70 l/min Air | RMA-25-BV | 10-100 l/min Air | RMA-32-BV | 5-50 cc/min Water | RMA-33-BV | 10-110 cc/min Water | RMA-34-BV | 20-300 cc/min Water | RMA-42-BV | 1-11 GPH Water | RMA-43-BV | 2-24 GPH Water | RMA-44-BV | 4-34 GPH Water | RMA-45-BV | 5-50 GPH Water |
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Series RMA Rate-Master® Flowmeter (2" scale) - Stainless Steel Valve
Model Number | Range | RMA-1-SSV | .05-.5 scfh Air | RMA-2-SSV | .1-1 scfh Air | RMA-3-SSV | .2-2 scfh Air | RMA-4-SSV | .5-5 scfh Air | RMA-5-SSV | 1-10 scfh Air | RMA-6-SSV | 2-20 scfh Air | RMA-7-SSV | 5-50 scfh Air | RMA-8-SSV | 10-100 scfh Air | RMA-9-SSV | 15-150 scfh Air | RMA-10-SSV | 20-200 scfh Air | RMA-151-SSV | 5-50 cc/min Air | RMA-150-SSV | 10-100 cc/min Air | RMA-11-SSV | 30-240 cc/min Air | RMA-12-SSV | 50-500 cc/min Air | RMA-13-SSV | 100-1000 cc/min Air |
| Model Number | Range | RMA-14-SSV | 200-2500 cc/min Air | RMA-26-SSV | .5-5 l/min Air | RMA-21-SSV | 1-10 l/min Air | RMA-22-SSV | 2-25 l/min Air | RMA-23-SSV | 5-50 l/min Air | RMA-24-SSV | 5-70 l/min Air | RMA-25-SSV | 10-100 l/min Air | RMA-32-SSV | 5-50 cc/min Water | RMA-33-SSV | 10-110 cc/min Water | RMA-34-SSV | 20-300 cc/min Water | RMA-42-SSV | 1-11 GPH Water | RMA-43-SSV | 2-24 GPH Water | RMA-44-SSV | 4-34 GPH Water | RMA-45-SSV | 5-50 GPH Water |
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Series RMA Rate-Master® Flowmeter (2" scale) - Top Mounted ValveModel Number | Range | RMA-1-TMV | .05-.5 scfh Air | RMA-2-TMV | .1-1 scfh Air | RMA-3-TMV | .2-2 scfh Air | RMA-4-TMV | .5-5 scfh Air | RMA-5-TMV | 1-10 scfh Air | RMA-6-TMV | 2-20 scfh Air | RMA-7-TMV | 5-50 scfh Air | RMA-8-TMV | 10-100 scfh Air | RMA-9-TMV | 15-150 scfh Air | RMA-10-TMV | 20-200 scfh Air | RMA-151-TMV | 5-50 cc/min Air | RMA-150-TMV | 10-100 cc/min Air | RMA-11-TMV | 30-240 cc/min Air | RMA-12-TMV | 50-500 cc/min Air | RMA-13-TMV | 100-1000 cc/min Air |
| Model Number | Range | RMA-14-TMV | 200-2500 cc/min Air | RMA-26-TMV | .5-5 l/min Air | RMA-21-TMV | 1-10 l/min Air | RMA-22-TMV | 2-25 l/min Air | RMA-23-TMV | 5-50 l/min Air | RMA-24-TMV | 5-70 l/min Air | RMA-25-TMV | 10-100 l/min Air | RMA-32-TMV | 5-50 cc/min Water | RMA-33-TMV | 10-110 cc/min Water | RMA-34-TMV | 20-300 cc/min Water | RMA-42-TMV | 1-11 GPH Water | RMA-43-TMV | 2-24 GPH Water | RMA-44-TMV | 4-34 GPH Water | RMA-45-TMV | 5-50 GPH Water |
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Series RMB Rate-Master® Flowmeter (5" scale)Model Number | Range | RMB-49 | .5-5 scfh Air | RMB-50 | 1-10 scfh Air | RMB-51 | 2-20 scfh Air | RMB-52 | 5-50 scfh Air | RMB-53 | 10-100 scfh Air | RMB-54 | 20-200 scfh Air | RMB-55 | 40-400 scfh Air | RMB-56 | 50-500 scfh Air | RMB-57 | 60-600 scfh Air | RMB-82 | 1-12 GPH Water | RMB-83 | 1-20 GPH Water |
| Model Number | Range | RMB-84 | 4-40 GPH Water | RMB-85 | 10-100 GPH Water | RMB-50D | 1.2-10 scfh/0.6-5 l/min Air | RMB-51D | 3-20 scfh/1.5-9.5 l/min Air | RMB-52D | 4-50 scfh/2-23 l/min Air | RMB-53D | 60-100 scfh/5-50 l/min Air | RMB-54D | 20-200 scfh/5-95 l/min Air | RMB-82D | 1-12 GPH/0.06-0.76 l/min Water | RMB-83D | 1-20 GPH/0.065-1.25 l/min Water | RMB-85D | 10-100 GPH/0.8-6.2 l/min Water |
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Series RMB Rate-Master® Flowmeter (5" scale) - Brass ValveModel Number | Range | RMB-49-BV | .5-5 scfh Air | RMB-50-BV | 1-10 scfh Air | RMB-51-BV | 2-20 scfh Air | RMB-52-BV | 5-50 scfh Air | RMB-53-BV | 10-100 scfh Air | RMB-54-BV | 20-200 scfh Air | RMB-55-BV | 40-400 scfh Air | RMB-56-BV | 50-500 scfh Air | RMB-57-BV | 60-600 scfh Air | RMB-82-BV | 1-12 GPH Water | RMB-83-BV | 1-20 GPH Water |
| Model Number | Range | RMB-84-BV | 4-40 GPH Water | RMB-85-BV | 10-100 GPH Water | RMB-50D-BV | 1.2-10 scfh/0.6-5 l/min Air | RMB-51D-BV | 3-20 scfh/1.5-9.5 l/min Air | RMB-52D-BV | 4-50 scfh/2-23 l/min Air | RMB-53D-BV | 60-100 scfh/5-50 l/min Air | RMB-54D-BV | 20-200 scfh/5-95 l/min Air | RMB-82D-BV | 1-12 GPH/0.06-0.76 l/min Water | RMB-83D-BV | 1-20 GPH/0.065-1.25 l/min Water | RMB-85D-BV | 10-100 GPH/0.8-6.2 l/min Water |
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Series RMB Rate-Master® Flowmeter (5" scale) - Stainless Steel ValveModel Number | Range | RMB-49-SSV | .5-5 scfh Air | RMB-50-SSV | 1-10 scfh Air | RMB-51-SSV | 2-20 scfh Air | RMB-52-SSV | 5-50 scfh Air | RMB-53-SSV | 10-100 scfh Air | RMB-54-SSV | 20-200 scfh Air | RMB-55-SSV | 40-400 scfh Air | RMB-56-SSV | 50-500 scfh Air | RMB-57-SSV | 60-600 scfh Air | RMB-82-SSV | 1-12 GPH Water | RMB-83-SSV | 1-20 GPH Water |
| Model Number | Range | RMB-84-SSV | 4-40 GPH Water | RMB-85-SSV | 10-100 GPH Water | RMB-50D-SSV | 1.2-10 scfh/0.6-5 l/min Air | RMB-51D-SSV | 3-20 scfh/1.5-9.5 l/min Air | RMB-52D-SSV | 4-50 scfh/2-23 l/min Air | RMB-53D-SSV | 60-100 scfh/5-50 l/min Air | RMB-54D-SSV | 20-200 scfh/5-95 l/min Air | RMB-82D-SSV | 1-12 GPH/0.06-0.76 l/min Water | RMB-83D-SSV | 1-20 GPH/0.065-1.25 l/min Water | RMB-85D-SSV | 10-100 GPH/0.8-6.2 l/min Water |
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Series RMC Rate-Master® Flowmeter (10" scale)Model Number | Range | RMC-101 | 5-50 scfh Air | RMC-102 | 10-100 scfh Air | RMC-103 | 20-200 scfh Air | RMC-104 | 40-400 scfh Air | RMC-105 | 60-600 scfh Air | RMC-106 | 100-1000 scfh Air | RMC-107 | 120-1200 scfh Air | RMC-108 | 180-1800 scfh Air | RMC-121 | 1-10 scfm Air |
| Model Number | Range | RMC-122 | 2-20 scfm Air | RMC-123 | 3-30 scfm Air | RMC-134 | 2-20 GPH Water | RMC-135 | 8-90 GPH Water | RMC-141 | .1-1 GPM Water | RMC-142 | .2-2.2 GPM Water | RMC-143 | .4-4 GPM Water | RMC-144 | .8-7 GPM Water | RMC-145 | 1.2-10 GPM Water |
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Series RMC Rate-Master® Flowmeter (10" scale) - Brass ValveModel Number | Range | RMC-101-BV | 5-50 scfh Air | RMC-102-BV | 10-100 scfh Air | RMC-103-BV | 20-200 scfh Air | RMC-104-BV | 40-400 scfh Air | RMC-105-BV | 60-600 scfh Air | RMC-106-BV | 100-1000 scfh Air | RMC-107-BV | 120-1200 scfh Air | RMC-108-BV | 180-1800 scfh Air | RMC-121-BV | 1-10 scfm Air |
| Model Number | Range | RMC-122-BV | 2-20 scfm Air | RMC-123-BV | 3-30 scfm Air | RMC-134-BV | 2-20 GPH Water | RMC-135-BV | 8-90 GPH Water | RMC-141-BV | .1-1 GPM Water | RMC-142-BV | .2-2.2 GPM Water | RMC-143-BV | .4-4 GPM Water | RMC-144-BV | .8-7 GPM Water | RMC-145-BV | 1.2-10 GPM Water |
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Series RMC Rate-Master® Flowmeter (10" scale)Model Number | Range | RMC-101-SSV | 5-50 scfh Air | RMC-102-SSV | 10-100 scfh Air | RMC-103-SSV | 20-200 scfh Air | RMC-104-SSV | 40-400 scfh Air | RMC-105-SSV | 60-600 scfh Air | RMC-106-SSV | 100-1000 scfh Air | RMC-107-SSV | 120-1200 scfh Air | RMC-108-SSV | 180-1800 scfh Air | RMC-121-SSV | 1-10 scfm Air | RMC-122-SSV | 2-20 scfm Air | RMC-123-SSV | 3-30 scfm Air | RMC-134-SSV | 2-20 GPH Water | RMC-135-SSV | 8-90 GPH Water | RMC-141-SSV | .1-1 GPM Water | RMC-142-SSV | .2-2.2 GPM Water | RMC-143-SSV | .4-4 GPM Water | RMC-144-SSV | .8-7 GPM Water | RMC-145-SSV | 1.2-10 GPM Water |
| Model Number | Range | RMC-101-SSV | 5-50 scfh Air | RMC-102-SSV | 10-100 scfh Air | RMC-103-SSV | 20-200 scfh Air | RMC-104-SSV | 40-400 scfh Air | RMC-105-SSV | 60-600 scfh Air | RMC-106-SSV | 100-1000 scfh Air | RMC-107-SSV | 120-1200 scfh Air | RMC-108-SSV | 180-1800 scfh Air | RMC-121-SSV | 1-10 scfm Air | RMC-122-SSV | 2-20 scfm Air | RMC-123-SSV | 3-30 scfm Air | RMC-134-SSV | 2-20 GPH Water | RMC-135-SSV | 8-90 GPH Water | RMC-141-SSV | .1-1 GPM Water | RMC-142-SSV | .2-2.2 GPM Water | RMC-143-SSV | .4-4 GPM Water | RMC-144-SSV | .8-7 GPM Water | RMC-145-SSV | 1.2-10 GPM Water |
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If you're looking for Dwyer Instruments Malaysia products, please contact us.
For special Rate-Masters flowmeters, you can have adjustable pointer flags for quick visual reference.

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 |  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 PTFE 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 PTFE Valve Seat 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 PTFE 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 PTFE Valve Seat 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 180-1800 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 |
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