Multiple Tube Flowmeters
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- Gary Jordan
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1 Multiple Tube Flowmeters xp The model xp multiple tube flowmeter line offers, the convenience and simplicity of 2, 3, 4, 5 and 6 tube meters, retaining most of the unique design features associated with single tube units. Multiple tube meters are available with 65mm or 150mm flowtubes same as used in single unit flowmeters. xp meters are convenient for applications where several streams of gases or liquids are to be metered in individual channels, or manifolded. Design Features * Rib-guided or fluted metering tubes facilitate stable, accurate readings. * Interchangeability of flowtubes and floats. Assorted flowtubes maybe used in conjunc tion with a single mounting frame, an apparent benefit in many laboratory applications. * Manifolding at inlet or outlet. * Ease of installation and exchange of flowtubes. * Non-rotating adapter feature - glass flow tubes are prevented from turning during the tightening phase of the assembly procedure. * OPTIGRAD scales minimize parallax and eye fatigue. * Chemical compatibility. * Simple means of panel mounting. Panel mounting is convertible to bench mounting through use of an optional acrylic tripod base with spirit leveler. Built-in Valves Meters may be supplied with built-in needle valves (CV ), high precision metering valves (MFV ) with non-rising stems, or with no valves. Generally for gas metering, it is recommended that valves are positioned at inlets (bottom) for liquids valves may be positioned either at outlets (top) or inlets. For vacuum service, valves must be mounted at outlets. If unspecified at the time of ordering, meters will be shipped with valves mounted at inlets. F L OW METERS F L OW C O N T RO L S
2 Please note that built-in-valves are always installed in the end block opposite to the manifolded one. Thus, if a meter is manifolded at the outlet, valves are installed at the inlets; if a meter is manifolded at the inlet, valves are installed at the outlets. Specifications Standard Component Accuracy: a.universal mm scales: ±2% of full scale reading, from 10 to 100% of scale. b. Direct reading scales: ±5% of full scale reading, from 10 to 100% of scale. Materials of Construction s: Heavy walled borosicilicate glass. Mounting Fittings in contact with Fluids: Black anodized aluminum or 316 stainless steel. Side Plates: Aluminum, black anodized. xp Conforming to ISA RP Specification 2-S-10. Manifolded models excepted. Calibrated Accuracy: ±1% FS Repeatability: to 0.25% Useful Flow Ranges: 10:1 minimum with one float. Better than 20:1 with combinations of two floats when used in gas service. Max. Operating Pressure: 200 psig/13.8 bars. 0 0 Max. Operating Temperature: 250 F/121 C. Tripod Bases: TP2 for two-, four-, and six-tube meters with isolated channels or manifolding at top (MT). TP3 for three-, and five-tube meters and all meters with manifolding at bottom (MB). Front Shield and Back Plate: 1/8 thick clear polycarbonate and white acrylics O-rings and packing: Buna-N O-rings in aluminum model. Viton O-rings in stainless steel meters. Viton packings. PTFE/Kalrez optional. Connections: 1/8 NPT female inlet and outlet connections. Optional hose and compression fittings are available (see page 16). Special Calibrations Consult Muis Controls for prices and availability. Mounting Dimensions See page 16. The following flow patterns are available: MFV Valve Cartridge Table 10 - MFV valve flow capacities 10 psig (0.7 kg/cm 2 ) inlet pressure, atmospheric exhaust Orifice Air Helium Water Number std. scfh std. scfh std. scfh
3 xp Table 11 - Multiple tube flowmeter options Model Material of Valve Number* End Fitting in Option Fluid Contact Two tube meters 2P03 aluminum no valve 2P04 aluminum CV 2P01 aluminum MFV 2P st. steel no valve 2P st. steel CV 2P st. steel MFV Three tube meters 3P03 aluminum no valve 3P04 aluminum CV 3P01 aluminum MFV 3P st. steel no valve 3P st. steel CV 3P st. steel MFV Four tube meters 4P03 aluminum no valve 4P04 aluminum CV 4P01 aluminum MFV 4P st. steel no valve 4P st. steel CV 4P st. steel MFV Five tube meters 5P03 aluminum no valve 5P04 aluminum CV 5P01 aluminum MFV 5P st. steel no valve 5P st. steel CV 5P st. steel MFV Six tube meters 6P03 aluminum no valve 6P04 aluminum CV 6P01 aluminum MFV 6P st. steel no valve 6P st. steel CV 6P st. steel MFV Mounting Dimensions Ordering When ordering please specify: 1. Model number from Table If manifolding at the inlet of the meter is desired,add suffix MB after the model number; similarly for manifolding at the outlet add the suffix MT. 3. Indicate size code, i.e. /6 or 65mm or /1 or 150mm. 4. numbers from tables 4, 5, 6, 7 or 8 (in sequence of mounting left to right). 5. List optional equipment, tripods, etc. Example: M 4 P 0 4 M T / G Describes an aluminum 4 -tube 150 mm meter with standard (CV) valves using four G flowtubes, manifold at the outlet of the meter. Table 12 - Optional Accessories TP1 F1H2 F1H4 F2H2 F2H4 F1C2 F1C4 F2C2 F2C4 Acrylic tripod base for bench mounting with spirit level Hose Nipple for 1/8 I.D. hose, brass. Hose Nipple for 1/4 I.D. hose, brass. Hose Nipple for 1/8 I.D. hose, 316 st. steel. Hose Nipple for 1/4 I.D. hose, 316 st. steel. Compression ftg. for 1/8 O.D. tubing, brass. Compression ftg. for 1/4 O.D. tubing, brass. Compression ftg. for 1/8 O.D. tubing, 316 st. steel. Compression ftg. for 1/4 O.D. tubing, 316 st. steel. Table 13 - Dimensions for P style meters All P Meters Scale Center Tube Tube Tube Tube Tube Tube Length Height To Center (A) (H) (D) Width (W) 65mm mm
4 How To Order P xp T xt S G Select the desired flowmeters style, including the choice of end fitting materials and valve options from appropriate catalog pages. Flowmeters are shipped with optional built-in valves installed at the inlets (bottom blocks), unless otherwise instructed. For vacuum service it is recommended that the valves should be positioned at the outlets of meters. Gas proportioners are designed with valves in the upper blocks, downstream from individual flowtubes for component gases. In manifolded multiple tube meters, valves are in the block opposite from the manifolded one (i.e. if manifolding is at the inlet, valves are in the outlet block, and vice versa). Frame Typical 150 mm Frame and Assembly Select flowtubes from Tables 4, 5, 6, 7 or 8. For nonstandard conditions and fluids follow the sizing procedures outlined on page 7. If direct reading scales are desired, Table 8 (page 11) represents typical air and water direct reading flowtubes, consult the company for a complete listing of available direct reading scales. When ordering flowtube subassemblies only, indicate the flowtube numbers including the float suffix. When ordering complete flowmeters it is important to specify frames, flowtube numbers and floats as shown in example below. Two floats may be installed in a flowtube. Assembly Flowmeter Product Code: / Size Code: Make Selection From Catalog Material Code of Fluid Contact Fittings: Black Anodized Aluminum Chrome Plated Brass 316 Stainless Steel Teflon PTFE Valve Option Code: No Valve High Precision Metering Valve (MFV ) Needle Valve (CV ) Size Code: 150 mm 65mm Options: Select From Tables 4, 5, 6, 7 and 8 or list of Direct Reading Scales Scale Code: Select From Tables 4, 5, 6, 7 and 8 list of Direct Reading Scales Float Code: Glass (black) Sappire (red) 316 Stainless Steel Carboloy (tungsten carbide) Tantalum G S ST C T Example: P 0 4 / G Teflon - Reg. trademark of DuPont Carboloy - Reg. trademark of General Electric Co.
5 Meter Sizing Flow capacity tables 4, 5, 6 and 7 are based on calibrations at standard conditions, meaning psia (1 atm) pressure and 70 F (21.1 C). Tables list maximum flow rates of flowtubes. The usable range of meters is at least 10:1, often more. Thus, as a rule of thumb, to estimate the minimum metering limit divide the flow rates listed, by ten. For gases or liquids with fluid properties not greatly different from the calibration media, tables apply directly, when working pressure and temperature are also approximately standard. Where the above conditions do not apply the maximum flow rates of the metered fluids are converted to equivalent standard flow rates of air or water. To do this calculate K as shown in charts, multiply the maximum flow rate with this factor, and select the appropriate flowtube size from the Flow Capacity tables 4, 5, 6 and 7. Calculation vs. Calibration It is very important that the correction factors as calculated from the accompanying equations are used for sizing only. These relationships are greatly simplified and will not provide precise predictable flow corrections. It is always best practice to calibrate meters for non-standard conditions on site, by using reliable means of calibration. In case of liquid flows at each major point along the scale, sample volumes are collected in a buret of a volumetric flask during measured time intervals. Volumes are interpolated to a unit of time such as for example [] or [cu. ft/hr] etc. A table or a graph is then constructed to establish a complete set of calibration data. In case of gas flows, calibration data can be similarly developed, except that collection of sample volumes is accomplished by means of gas sampling devices, the simplest of which is a soap bubble meter. Table 1 - Float Densities Material Density [g/ml] glass 2.53 sapphire 3.98 stainless steel 8.04 Carboloy tantalum Gas Flow Q air =K gas X Q gas K gas = Where: G x T act T o x P o P act Q air = equiv.air flow capacity at Standard Conditions (STP) Q gas = maximum flow of metered gas G = specific gravity of metered gas (from Table 3) T act = absolute tempure at flow conditions, deg R or deg K T o = absolute temperature at Standard Conditions (STP) deg R (530) or deg K (294) P act = pressure at flow conditions, psia P o = pressure at Standard Conditions (STP), (14.7 psia) Liquid Flow Q water =K liq X Q liq K liq = Where: (d F - d W ) (d F - d L ) x d L d W Q water = equivalent water flow capacity at Standard Conditions (STP) Q liq = maximum flow of metered liquid d F = density of float selected, (see table 2), (g/ml) d L = density of metered liquid, (g/ml) d W = density of water at Standard Conditions (STP) (1.0 g/ml) Table 2 - Conversion Factors Multiply By To Obtain atm lbs/sq. in atm kg/sq. cm lbs/sq. in kg/sq. cm liters/min X 10 cu. ft/min x 10 gal/hr cu. ft/hr 472 gal/min 3785 g/ml lbs/cu. ft g/ml lbs/cu. in Table 3 - Density, Viscosity and Specific Gravity of Gases Gas Density Viscosity Specific Gravity [g/ml] [centipols] G[air=1.0] acetylene air ammonia argon butane carbon dioxide carbon monoxide chlorine ethane ethylene helium hydrogen hydrogen chloride methane nitrogen nitrous oxide oxygen propane sulfur dioxide
6 Table of Standard Flow Capacities Table 5-65mm s (See Table 8 for Gas Flow Capacities) Maximum Flow Rate Number Air Water [s] [scfh] [] [gph] G Table 4-150mm s S (See Table 7 for Gas Flow Capacities) ST Maximum Flow Rate C Number Air Water T [s] [scfh] [] [gph] G G S S ST ST C C T ST G G S S ST ST C C T T G G S S ST ST C C T T G G S S ST ST C C T T G G S S ST ST C C T G G S S ST ST C C T G ST G G S S ST ST C C T T G G S S ST ST C C T T G G S S ST ST C C T T * Suffix refers to float materials; G = Black Glass, S = Sapphire (red), ST = 316 Stainless Steel, C = Carboloy, T = Tantalum
7 For direct reading (engineering units) scale flowtubes contact Muis Controls. Flow capacities shown in Tables 4, 5, 6 and 7 are based air or water at STP conditions see paragraph on o on calibrations at standard (STP) conditions (70 F METER SIZING on page 4. o /21.1 C and 14.7psia / 1 atm abs). For fluids other than Table 6-150mm flowtubes, gas flow capacities of routine gases Number Maximum Flow Rate Argon Carbon Dioxide Helium Hydrogen Nitrogen Oxygen [s] [scfh] [s] [scfh] [s] [scfh] [s] [scfh] [s] [scfh] [s] [scfh] G S ST C T G S ST C T G S ST C T G S ST C T G S ST C T G S ST C T G S ST C T G S ST C T G S ST C T *Suffix refers to float materials: G = black glass, S = sapphire (red), ST = 316 stainless steel, C = Carboloy, T = tantalum
8 Table of Standard Capacities Table 7-65mm flowtubes, gas flow capacities of routine gases Maximum Flow Rate Number Argon Carbon Dioxide Helium Hydrogen Nitrogen Oxygen [s] [scfh] [s] [scfh] [s] [scfh] [s] [scfh] [s] [scfh] [s] [scfh] G S ST C T G S ST C T G S ST C T G S ST C T G S ST C T G S ST C G S ST C G ST G S ST C T G S ST C T G S ST C T *Suffix refers to float materials: G = black glass, S = sapphire (red), ST = 316 stainless steel, C = Carboloy, T = tantalum
9 Table 8 - Partial List of Direct Reading Scales (Accuracy = ± 5% F.S.) Table of Standard Capacities Air-65mm Maximum Flow Air-150mm Maximum Flow Water 65mm Maximum Flow Water 150mm Maximum Flow G 7 s S 25 s G S ST 50 s S 50 s ST C G 100 s C 100 s ST ST C 250 s S 500 s ST G C 500 s G 800 s ST G G 1 sl/min C 1.25 sl/min G G G 5 sl/min G 2.5 sl/min G C ST 10 sl/min S 5 sl/min ST ST ST 25 sl/min C 10 sl/min S 1.0 L/min ST 1.2 L/min ST 40 sl/min ST 42 sl/min ST 1.5 L/min T 2 L/min Flowmeters with dual-floats have a turndown ratio better than 20:1 KA Aluminum Kit shown Three types of kits are offered: * Model KA Aluminum Flowmeter Kit. * Model KS Stainless Steel Flowmeter Kit. * Model KT Teflon PTFE Flowmeter Kit. F L OW METERS F L OW C O N T RO L S
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