Series HF Flow Monitor Sherman Instruments Contact Us! Home Flow Monitor Index
©2012 John Sherman Agencies Ltd.
For Air, Water or Caustic Fluids. Ranges from 2-900 SCFM Air, 0.5-150 GPM Water and up to 25 GPM Oil. Dual Scales Maximum pressures from 600 to 6000 PSIG Available in Aluminium, Brass, or Stainless Steel Low Cost, Durable Flow Monitors have a patented design based on a floating sharp- edged orifice disk and variable area flow measurement to yield accuracy of +/-2.5%  over centre one-third of scale. This unique design allows accurate performance with  fluid viscosities up to 500 SSU. All internal wetted parts are contained inside a  sealed metal tubular casing assuring a virtually maintenance-free unit. Flowing  media forces linear motion of a spring loaded, sharp edge orifice disk and ring  shaped transfer magnet which both ride on a tapered centre shaft. The transfer  magnet drives a clearly visible magnet follower located outside the flow tube,  protected under the clear Lexan® tube. A ring on the magnet follower indicates flow  rate on the direct reading scale. Rubber bumpers are provided for external impact  resistance.
Dimensions Size “A” “B” Wrench Flats “C” 1/4” to 1/2” NPT 1-7/8” 1¼” 6-9/16” 47.63mm 31.75mm 166.69mm 3/4” to 1” NPT 2-3/8” 1-3/4” 7-5/32” 60.33mm 44.45mm 181.77mm 1¼ to 1½” NPT 3-1/2” 2-1/4” 10-1/8” 88.9mm 57.15mm 257.18mm 2” NPT 3-1/2” 2-1/4” 12-5/8” 88.9mm 57.15mm 320.68mm
Specifications: Service: Compatible gases or liquids. Wetted Materials: HFA: aluminum casing, Buna-N seals, PTFE coated Alnico magnet, stainless steel disk; HFB: brass casing, Buna-N seals, PTFE coated Alnico magnet, stainless steel disk; HFS: 303 SS casing, FKM seals with PTFE backup, PTFE coated Alnico magnet, stainless steel disk; HFH: brass casing, FKM seals with PTFE backup, PTFE coated Alnico magnet, stainless steel disk. Maximum Viscosity: 500 SSU. Temperature Limits: HFA, HFL, HFB and HFS Models: 240°F (116°C); HFH Models: 400°F (204°C). Pressure Limits: HFA Models: 600 psig (41 bar); HFL, HFB and HFH Models: 3500 psig (240 bar); HFS Models: 1000 psig (70 bar) for air and gas, 6000 psig (413 bar) for liquids. Accuracy: ±4% FS over entire range; ±2.5% over center third of the measuring range. Repeatability: ±1% of full scale. Shipping Weight: 1/4 to 1/2" female NPT Models: 2 lb (0.9 kg); 3/4 to 1" female NPT Models: 3.5 lb (1.59 kg); 1-1/2" female NPT Models: 11 lb (5 kg); 2" female NPT Models: 13.5 lb (6.12 kg).

Model Charts

HF Series Flow Monitors

Units for Air and other non-corrosive gases

Range scfm (lps) Connection Aluminum Brass Stainless Steel (Female NPT) Body Body Body 1.5-12 (0.5-5.5) 1/4” HFA-1-001 HFB-1-001 HFS-1-001 4-23 (2-10) 1/4” HFA-1-002 HFB-1-002 HFS-1-002 5-50 (2.5-25) 1/4” HFA-1-003 HFB-1-003 HFS-1-003 10-100 (5-45) 1/4” HFA-1-004 HFB-1-004 HFS-1-004 1.5-12 (.5-5.5) 3/8” HFA-8-001 HFB-8-001 HFS-8-001 4-23 (2-10) 3/8” HFA-8-002 HFB-8-002 HFS-8-002 5-50 (2.5-25) 3/8” HFA-8-003 HFB-8-003 HFS-8-003 10-100 (5-45) 3/8” HFA-8-004 HFB-8-004 HFS-8-004 1.5-12 (.5-5.5) 1/2” HFA-2-001 HFB-2-001 HFS-2-001 4-23 (2-10) 1/2” HFA-2-002 HFB-2-002 HFS-2-002 5-50 (2.5-25) 1/2” HFA-2-003 HFB-2-003 HFS-2-003 10-100 (5-45) 1/2” HFA-2-004 HFB-2-004 HFS-2-004 5-50 (3-23) 3/4” HFA-3-003 HFB-3-003 HFS-3-003 10-100 (4-48) 3/4” HFA-3-004 HFB-3-004 HFS-3-004 15-150 (8-56) 3/4” HFA-3-005 HFB-3-005 HFS-3-005 30-330 (20-150) 3/4” HFA-3-006 HFB-3-006 HFS-3-006 5-50 (3-23) 1” HFA-4-003 HFB-4-003 HFS-4-003 10-100 (4-48) 1” HFA-4-004 HFB-4-004 HFS-4-004 15-150 (8-56) 1” HFA-4-005 HFB-4-005 HFS-4-005 30-330 (20-150) 1” HFA-4-006 HFB-4-006 HFS-4-006 30-470 (15-220) 1-1/4” HFA-9-007 HFB-9-007 HFS-9-007 150-900 (75-425) 1-1/4” HFA-9-008 HFB-9-008 HFS-9-008 30-470 (15-220) 1-1/2” HFA-5-007 HFB-5-007 HFS-5-007 150-900 (75-425) 1-1/2” HFA-5-008 HFB-5-008 HFS-5-008
Units for Water based fluids (non-steam) - Brass Body Range GPM (l/m) Connection Part Number (Female NPT) 0.5-5.0 (1-19) 1/2” HFB-2-05 2-15 (7.5-55) 3/4” HFB-3-15 2-20 (7.5-75) 3/4” HFB-3-20 5-35 (19-130) 1” HFB-4-35 5-50 (19-189) 1-1/2” HFB-5-50 10-100 (38-379) 1-1/2” HFB-5-100 8-75 (31-284) 2” HFB-6-75 20-150 (76-568) 2” HFB-6-150 Units for Oil based Fluids - Aluminium Body Range GPM (l/m) Connection Part Number (Female NPT) 0.5-5.0 (1-19) 1/2” HFL-2-05 2-25 (7.5-95) 1” HFL-4-25 Units for High Pressure Fluids - 304SS Body Range GPM (l/m) Connection Part Number (Female NPT) 0.2-2.0 (0.75-7.5) 1/2” HFS-2-02 0.5-10 (1.9-38) 1/2” HFS-2-10