Dwyer Rate-Master Flowmeters - Sherman Instruments

Sherman Instruments

Range Codes

VFA Series for Water Range Code cc/min Water 6-50 32 10-100 33 20-200 34 US Gal./hr Water 0.6-5 41 2-10 42 3-20 43 8-40 44

VFB Series for Air Range Code SCFH Air 0.3-3 50 1-10 91 2-20 51 4-40 52 10-100 53 10-150 54 20-200 55 SCFH & l/m Air 0.6-5/0.3-2.5 92D 1-10/0.6-4.8 91D 2-20/0.5-9.5 51D 6-50/3-23 93D 10-100/6-48 53D 15-150/5-70 54D 40-200/20-95 55D SCFM Air 0.3-3 90 cc/min (ml/m) Air 100-1000 60 l/m Air 0.2-4 65 1-10 66 1-20 67 3-30 68 4-40 69

VFB Series for Water Range Code US Gal/hr. Water 0.5-12 80 6-60 81 1-20 83 6-40 84 US GPH & l/m Water 0.5-12/0.04-0.74 80D 1-20/0.1-1.3 83D 10-100/0.5-6.5 94D US GPM Water 0.2-2 85 0.6-5 86 cc/min (ml/m) Water 2-30 82

VFC Series for Air Range Code SCFM Air 4-25 121 5-50 122 10-100 123 l/m Air 100-700 131 200-1400 132 300-2800 133

VFC Series for Water Range Code US GPM Water 0.5-5 141 1-10 142 2-20 143 l/m Water 2-20 151 4-40 152 10-75 153

VFA/VFB Flowmeter Dimensions click image to enlarge

• Precision machined from solid acrylic • Used to indicate or manually control air or gas flow from .1 SCFH to 100 SCFM or water flow from .6 GPH to 20 GPM Dwyer Visi-Float flowmeter bodies are cut and precision machined from solid, clear acrylic plastic blocks. This contruction not only produces a handsome finished product, but permits complete visual inspection. As a result, the Dwyer Visi-Float flowmeters are espcially popular for medical and laboratory equipment applications. Scales are easy to read - The front scale location and white background provides excellent visibility. The direct reading scales are hot stamped into the plastic and will not wear off. Mid-range calibration is established with a master flowmeter. Accuracy is +/-5% of full scale for VFA models, +/-3% for VFB, and +/- 2% for VFC. Scales average 2" long on the VFA models, 4" long on the VFB and 5" long on VFC. Durable and attractive construction - The machined acrylic bodies of the Dwyer Visi-Float flowmeters are practically unbreakable. Fabrication is backed by over 60 years of experience in acrylic instrument machining. The tapered bore is precision machined to a smooth surface that provides perfect visibility of the indicating float. The VFA and VFB models are available with either brass or stainless steel inlet and outlet connections and are tapped for 1/8"NPT thread. VFB models 85 and 86 have either 1/4" back or 3/8" end connections. The VFC models have PVC 1" NPT female connections and VFCII units are equipped with acetal thermoplastic 1"NPT male fittings. VFCII fittings also include hex wrench flats to prevent stripped threads. Precision metering valves in brass or stainless steel are available for most VFA and VFB models. VFC models, intended for use with external metering valves, include a stainless steel guide rod and large diameter float for excellent stability and visibility at higher flow rates. Two options are offered for VFCII units, specifically designed for applications requiring FDA approved materials. Choose 316 stainless steel float and guide rod and Viton® "O" rings. Easy installation - All Visi-Float flowmeters have metal mounting inserts on read for panel mounting. They can also be supported directly by system piping. Viton® is a registered trademark of DuPont Dow Elastomers

VFA 2” Scale

VFB 4” Scale

VFC 5” Scale

VFC Options -EC End Connections -VIT Flouroelastomer O-Rings

VFB Options -BV Brass Valve -SSV Stainless Steel Valve -NIST NIST Traceable Calibration Certificate -PF Pointer Flag -SPCL Special Cleaning (must add -VIT option) -SS Stainless Steel wetted parts (no valve) -VIT Fluoroelastomer O-Rings -PTFE PTFE Valve Seat (for Oxygen/Ozone applications)

VFA Options -BV Brass Valve -SSV Stainless Steel Valve -NIST NIST Traceable Calibration Certificate -PF Pointer Flag -SPCL Special Cleaning (must add -VIT option) -SS Stainless Steel wetted parts (no valve) -VIT Fluoroelastomer O-Rings -PTFE PTFE Valve Seat (for Oxygen/Ozone applications)

VFC/VFCII Flowmeter Dimensions click image to enlarge

VFA with Valve

VFB with Valve

VFC with End Connections

Specifications Meter Body Acrylic plastic. Metering tube machined into body Wetted Metal Parts VFA & VFB: Brass Standard; Stainless Steel Optional VFC: Stainless Steel Standard Floats Stainless Steel, Black Glass, Aluminum, K Monel (depends upon range) Float Stops Stainless Steel Springs Pipe Connections VFA: 1/8" FNPT VFB: 1/8" FNPT* *VFB 85 & 86: 1/4" Back or 3/8" End Connections VFC: 1" FNPT VFCII: 1" MNPT "O" Rings Buna-N Mounting Inserts 10-32x1/4" deep Scale Hot Pressed into acrylic body Knobs ABS Plastic Maximum Pressures VFA & VFB without valve: 100 PSIG (690 kPa)@150°F (85°C) and Temperatures 150 PSIG (1000 kPa) @ 100°F (38°C) VFA & VFB with valve: 100 PSIG (690 kPa) @ 150°F (85°C); VFC: 100 PSIG (690 kPa) @ 120°F (48°C) Accuracy VFA: ±5% of full scale VFB: ±3% of full scale VFC: ±2% of full scale