HOW TO ORDER Use the bold characters from the chart below to construct a product code. ©Copyright 2021 Dwyer Instruments, Inc. Printed in U.S.A. 2/21 DS-RM Rev. 3 SERIES RM | RATE-MASTER ® POLYCARBONATE FLOWMETER ® The Series RM Rate-Master® Polycarbonate Flowmeter is 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. With 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. • 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 with the presence of scale graduations on both side of the indicating tube • Medical equipment • Air samplers • Gas analyzers • Pollution monitors • Chemical injectors • Cabinet purging BENEFITS/FEATURES DESCRIPTIONAPPLICATIONS ORDER ONLINE TODAY! dwyer-inst.com/Product/SeriesRM DWYER INSTRUMENTS, INC. Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current. 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 SERIES RMA: 2˝ (51 mm) scale RMB: 5˝ (127 mm) scale RMC: 10˝ (254 mm) scale VALVE BLANK: Standard (no valve) -SSV: Stainless steel valve -TMV: Top mounted valve (RMA only) OPTIONS -APF: Adjustable pointer flag (RMA only) -ARB: Arbitrary scale -AT: Aluminum tag -BO: Body only -BOV: Body only valve unit -BPF: Adjustable pointer flag (RMB only) -CPF: Adjustable pointer flag (RMC only) -NIST: NIST traceable calibration certificate -PTFE: PTFE valve seat -SPCL: Special cleaning -VIT: Fluoroelastomer O-rings -WL: Without logo RANGE RMA -1: 0.05 to 0.4 SCFH air -2: 0.1 to 1 SCFH air -3: 0.2 to 2 SCFH air -4: 0.5 to 5 SCFH air -5: 1 to 10 SCFH air -6: 2 to 20 SCFH air -7: 5 to 50 SCFH air -8: 10 to 100 SCFH air -9: 15 to 150 SCFH air -10: 20 to 240 SCFH air -151: 5 to 50 CC/min air -150: 10 to 100 CC/min air -11: 30 to 200 CC/min air -12: 50 to 500 CC/min air -13: 100 to 1000 CC/min air -14: 200 to 2500 CC/min air -15: 400 to 5000 CC/min air -16: 1000 to 10000 CC/min air -26: 0.5 to 5 LPM air -21: 1 to 10 LPM air -22: 2 to 25 LPM air -23: 5 to 50 LPM air -24: 5 to 70 LPM air -25: 10 to 100 LPM air -32: 5 to 50 CC/min water -33: 10 to 110 CC/min water -34: 20 to 300 CC/min water -42: 1 to 11 GPH water -43: 2 to 24 GPH water -44: 4 to 34 GPH water -45: 5 to 50 GPH water RMA-1-SSV-ARB RMB -49: 0.5 to 5 SCFH air -50: 1 to 10 SCFH air -51: 2 to 20 SCFH air -52: 5 to 50 SCFH air -53: 10 to 100 SCFH air -54: 20 to 200 SCFH air -55: 40 to 400 SCFH air -56: 50 to 500 SCFH air -57: 60 to 600 SCFH air -82: 1 to 12 GPH water -83: 1 to 20 GPH water -84: 4 to 40 GPH water -85: 10 to 100 GPH water -50D: 1.2 to 10 SCFH and 0.6 to 5 LPM air -51D: 2 to 20 SCFH and 1.5 to 9.5 LPM air -52D: 4 to 50 SCFH and 2 to 23 LPM air -53D: 10 to 100 SCFH and 5 to 50 LPM air -54D: 20 to 200 SCFH and 10 to 95 LPM air -82D: 1 to 12 GPH and 0.06 to 0.76 LPM water -83D: 1 to 20 GPH and 0.065 to 1.25 LPM water -85D: 10 to 100 GPH and 0.5 to 6.2 LPM water RMC -101: 5 to 50 SCFH air -102: 10 to 100 SCFH air -103: 20 to 200 SCFH air -104: 40 to 400 SCFH air -105: 60 to 600 SCFH air -106: 100 to 1000 SCFH air -107: 120 to 1200 SCFH air -108: 200 to 1800 SCFH air -121: 1 to 10 SCFM air -122: 2 to 20 SCFM air -123: 3 to 30 SCFM air -134 2 to 20 GPH water -135: 8 to 90 GPH water -141: 0.1 to 1 GPM water -142: 0.2 to 2.2 GPM water -143: 0.4 to 4 GPM water -144: 0.8 to 7 GPM water -145: 1.2 to 10 GPM waterDIMENSIONS MOUNTING DIAGRAM DIMENSIONS in [mm] Model RMAModel RMBModel RMC A4-9/16 [115.90]8-1/2 [215.90]15-1/8 [384.20] B3 [76.20] 1/8˝ NPT conn. 6-7/16 [163.50] 1/4˝ NPT conn. 12-1/4 [311.20] 1/2˝ NPT conn. C1-5/8 [41.28] 10-32 mtg. holes 3-15/16 [100.00] 1/4-20 mtg. holes 8-3/4 [222.30] 3/8-24 mtg. holes D3/8 [9.525]5/8 [15.88]1 [25.40] E1-1/16 [26.99]1-7/8 [47.63]2-3/4 [69.85] F1-3/16 [30.16]1-3/4 [44.45]2-1/2 [63.50] G11/16 [17.46]1 [25.40]1-7/16 [36.51] H 61/64 [24.21]1-7/16 [36.51]1-31/32 [50.00] I1-3/8 [34.92]1-13/16 [46.04]2-1/2 [63.50] J3/4 [19.05]1-1/4 [31.75]2 [50.80] K4-13/16 [122.20]8-3/4 [222.30]15-3/8 [390.50] L1 [25.40]1-1/2 [38.10]2-1/4 [57.15] A BC D E F G H I J K L FULL OPEN BACK WIDTH MOUNTING BRACKET SCREW 4 REQUIRED SPECIFICATIONS Service Compatible gases and liquids. Wetted MaterialsBody: Polycarbonate; O-ring: Neoprene and Buna-N; Metal parts: SS; Float: SS, black glass, aluminum, K monel, tungsten carbide depending on range. Temperature Limit130°F (54°C). Pressure Limit100 psi (6.9 bar). AccuracyRMA: 4% FS; RMB: 3% FS; RMC: 2% FS. Process ConnectionRMA: 1/8˝ female NPT; RMB: 1/4˝ female NPT; RMC: 1/2˝ female NPT. WeightRMA: 4 oz (113.4 g); RMB: 13 oz (368.5 g); RMC: 29 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. ACCESSORIES ModelDescription RKA RK-RMB Regulator kit for Series VFA Regulator kit for Series VFB Regulator Kits Available as optional extras for the Visi-Float ® Flowmeter models. Recommended for use where inlet air pressure fluctuates widely and constant flow is required. The regulator maintains a constant pressure differential of approximately 3 ±0.15 psig. Supply pressure must be at least 3 psig above the flowmeter discharge to operate. The standard regulator may be used up to 200 scfh.DIMENSIONS MOUNTING DIAGRAM DIMENSIONS in [mm] Model RMAModel RMBModel RMC A4-9/16 [115.90]8-1/2 [215.90]15-1/8 [384.20] B3 [76.20] 1/8˝ NPT conn. 6-7/16 [163.50] 1/4˝ NPT conn. 12-1/4 [311.20] 1/2˝ NPT conn. C1-5/8 [41.28] 10-32 mtg. holes 3-15/16 [100.00] 1/4-20 mtg. holes 8-3/4 [222.30] 3/8-24 mtg. holes D3/8 [9.525]5/8 [15.88]1 [25.40] E1-1/16 [26.99]1-7/8 [47.63]2-3/4 [69.85] F1-3/16 [30.16]1-3/4 [44.45]2-1/2 [63.50] G11/16 [17.46]1 [25.40]1-7/16 [36.51] H 61/64 [24.21]1-7/16 [36.51]1-31/32 [50.00] I1-3/8 [34.92]1-13/16 [46.04]2-1/2 [63.50] J3/4 [19.05]1-1/4 [31.75]2 [50.80] K4-13/16 [122.20]8-3/4 [222.30]15-3/8 [390.50] L1 [25.40]1-1/2 [38.10]2-1/4 [57.15] A BC D E F G H I J K L FULL OPEN BACK WIDTH MOUNTING BRACKET SCREW 4 REQUIRED SPECIFICATIONS Service Compatible gases and liquids. Wetted MaterialsBody: Polycarbonate; O-ring: Neoprene and Buna-N; Metal parts: SS; Float: SS, black glass, aluminum, K monel, tungsten carbide depending on range. Temperature Limit130°F (54°C). Pressure Limit100 psi (6.9 bar). AccuracyRMA: 4% FS; RMB: 3% FS; RMC: 2% FS. Process ConnectionRMA: 1/8˝ female NPT; RMB: 1/4˝ female NPT; RMC: 1/2˝ female NPT. WeightRMA: 4 oz (113.4 g); RMB: 13 oz (368.5 g); RMC: 29 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. ACCESSORIES ModelDescription RKA RK-RMB Regulator kit for Series VFA Regulator kit for Series VFB Regulator Kits Available as optional extras for the Visi-Float ® Flowmeter models. Recommended for use where inlet air pressure fluctuates widely and constant flow is required. The regulator maintains a constant pressure differential of approximately 3 ±0.15 psig. Supply pressure must be at least 3 psig above the flowmeter discharge to operate. The standard regulator may be used up to 200 scfh.HOW TO ORDER Use the bold characters from the chart below to construct a product code. ©Copyright 2021 Dwyer Instruments, Inc. Printed in U.S.A. 2/21 DS-RM Rev. 3 SERIES RM | RATE-MASTER ® POLYCARBONATE FLOWMETER ® The Series RM Rate-Master® Polycarbonate Flowmeter is 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. With 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. • 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 with the presence of scale graduations on both side of the indicating tube • Medical equipment • Air samplers • Gas analyzers • Pollution monitors • Chemical injectors • Cabinet purging BENEFITS/FEATURES DESCRIPTIONAPPLICATIONS ORDER ONLINE TODAY! dwyer-inst.com/Product/SeriesRM DWYER INSTRUMENTS, INC. Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current. 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 SERIES RMA: 2˝ (51 mm) scale RMB: 5˝ (127 mm) scale RMC: 10˝ (254 mm) scale VALVE BLANK: Standard (no valve) -SSV: Stainless steel valve -TMV: Top mounted valve (RMA only) OPTIONS -APF: Adjustable pointer flag (RMA only) -ARB: Arbitrary scale -AT: Aluminum tag -BO: Body only -BOV: Body only valve unit -BPF: Adjustable pointer flag (RMB only) -CPF: Adjustable pointer flag (RMC only) -NIST: NIST traceable calibration certificate -PTFE: PTFE valve seat -SPCL: Special cleaning -VIT: Fluoroelastomer O-rings -WL: Without logo RANGE RMA -1: 0.05 to 0.4 SCFH air -2: 0.1 to 1 SCFH air -3: 0.2 to 2 SCFH air -4: 0.5 to 5 SCFH air -5: 1 to 10 SCFH air -6: 2 to 20 SCFH air -7: 5 to 50 SCFH air -8: 10 to 100 SCFH air -9: 15 to 150 SCFH air -10: 20 to 240 SCFH air -151: 5 to 50 CC/min air -150: 10 to 100 CC/min air -11: 30 to 200 CC/min air -12: 50 to 500 CC/min air -13: 100 to 1000 CC/min air -14: 200 to 2500 CC/min air -15: 400 to 5000 CC/min air -16: 1000 to 10000 CC/min air -26: 0.5 to 5 LPM air -21: 1 to 10 LPM air -22: 2 to 25 LPM air -23: 5 to 50 LPM air -24: 5 to 70 LPM air -25: 10 to 100 LPM air -32: 5 to 50 CC/min water -33: 10 to 110 CC/min water -34: 20 to 300 CC/min water -42: 1 to 11 GPH water -43: 2 to 24 GPH water -44: 4 to 34 GPH water -45: 5 to 50 GPH water RMA-1-SSV-ARB RMB -49: 0.5 to 5 SCFH air -50: 1 to 10 SCFH air -51: 2 to 20 SCFH air -52: 5 to 50 SCFH air -53: 10 to 100 SCFH air -54: 20 to 200 SCFH air -55: 40 to 400 SCFH air -56: 50 to 500 SCFH air -57: 60 to 600 SCFH air -82: 1 to 12 GPH water -83: 1 to 20 GPH water -84: 4 to 40 GPH water -85: 10 to 100 GPH water -50D: 1.2 to 10 SCFH and 0.6 to 5 LPM air -51D: 2 to 20 SCFH and 1.5 to 9.5 LPM air -52D: 4 to 50 SCFH and 2 to 23 LPM air -53D: 10 to 100 SCFH and 5 to 50 LPM air -54D: 20 to 200 SCFH and 10 to 95 LPM air -82D: 1 to 12 GPH and 0.06 to 0.76 LPM water -83D: 1 to 20 GPH and 0.065 to 1.25 LPM water -85D: 10 to 100 GPH and 0.5 to 6.2 LPM water RMC -101: 5 to 50 SCFH air -102: 10 to 100 SCFH air -103: 20 to 200 SCFH air -104: 40 to 400 SCFH air -105: 60 to 600 SCFH air -106: 100 to 1000 SCFH air -107: 120 to 1200 SCFH air -108: 200 to 1800 SCFH air -121: 1 to 10 SCFM air -122: 2 to 20 SCFM air -123: 3 to 30 SCFM air -134 2 to 20 GPH water -135: 8 to 90 GPH water -141: 0.1 to 1 GPM water -142: 0.2 to 2.2 GPM water -143: 0.4 to 4 GPM water -144: 0.8 to 7 GPM water -145: 1.2 to 10 GPM waterNext >