Turbine Flow Meter
Contents
1. Size A B D B150 501 F15 5 00 in 127 0 mm 2 52 in 64 0 mm 3 50 in 88 9 mm 1 03 in 26 7 mm B150 502 F15 5 00 in 127 0 mm 2 52 in 64 0 mm 3 50 in 88 9 mm 1 06 in 26 9 mm B150 503 F15 5 00 in 127 0 mm 2 62 in 66 5 mm 1 12 in 28 4 mm B150 625 F15 5 50 in 139 7 mm 2 62 in 66 5 mm 3 50 in 88 9 mm 1 19 in 30 2 mm B150 750 F15 3 50 in 88 9 mm 3 88 in 99 6 mm 5 50 in 139 7 mm 2 72 in 69 1 mm B150 110 F15 5 50 in 139 7 mm 2 82 in 71 6 mm 4 25 in 107 9 mm 1 37 in 34 8 mm B150 125 F15 6 00 in 152 4 mm 2 92 in 74 2 mm 4 62 in 117 3 mm 1 49 in 37 8 mm B150 115 F15 6 00 in 152 4 mm 3 12 in 79 2 mm 5 00 in 127 8 mm 1 61 in 40 9 mm B150 120 F15 6 50 in 165 1 mm 3 32 in 84 3 mm 6 00 in 152 4 mm 1 84 in 46 7 mm 1 26 in 32 0 mm Page 14 TRB UM 01798 EN 01 October 2015 User Manual INTENTIONAL BLANK PAGE October 2015 TRB UM 01798 EN 01 Page 15 Turbine Flow Meter B1500 Series Control Manage Optimize Blancett is a registered trademark of Badger Meter Inc Other trademarks appearing in this document are the property of their respective entities Due to continuous research product improvements and enhancements Badger Meter reserves t2. 0 02 of reading Response Time 2 3 ms at 1 2 cSt Body 316 stainless steel Materials of Shafts 316 stainless steel Construction Rotors 17 4 PH stainless steel Bearing Ceramic Materials Materials listed in below are used for most turbine flow meter applications For unusual requirements such as those outside the range of 300 350 184 176 C or those with extremely corrosive liquids consult the factory Page 12 Part Type Bearing Hybrid ceramic Body 316 C Washer 302 Hub 303 Locknut CRS plated Pickoff 304 Spacer 303 Spring 302 Snap Ring 303 Straightener Assembly 316 Rotor 17 4 SS TRB UM 01798 EN 01 October 2015 Flow Ranges Specifications Part Number Flow Range AP at 10 1 K Factor B150 501 0 25 2 50 gpm 0 9 9 5 lpm 3 5 PSID 0 25 kg cm 28 800 US gal min 7910 L min B150 502 0 5 5 0 gpm 1 9 18 9 lpm 4 5 PSID 0 32 kg cm 14 400 US gal min 3805 L min B150 503 0 75 7 50 gpm 2 8 28 4 lpm 6 0 PSID 0 42 kg cm 9600 US gal min 2536 L min B150 625 1 25 12 50 gpm 4 7 47 3 lpm 5 0 PSID 0 35 kg cm 5760 US gal min 1522 L min B150 750 2 5 25 0 gpm 9 5 94 6 lpm 5 0 PSID 0 35 kg cm 2800 US gal min 761 L min B150 110 5 0 50 0 18 9 189 3 lpm 5 0 PSID 0 35 kg cm 1440 US gal min 380 L min B150 125 7 5 75 0 gpm 28 3 283 9 lpm 5 5 PSID 0 39 kg cm 960 US gal min 254 L mi
3. E oe dh ade ees we ae Aes GE Ae Um EROR ee Gok RUE ae RR 11 Recalibration zs du Foxe chee Rho te ds eka P a hehe te aad NUUS p Sa ap Up RESOURCE 12 October 2015 TRB UM 01798 EN 01 Page iii Turbine Flow Meter B1500 Series Specifications x cios acd iot AO Iob Saw ae dee ae we lw Bel at a o 12 Flow Ranges sss sk aps Bid E dora OPE OPER oath adu eR E Nube REA qe EY Ps 13 Pressure qe doce oe queo Ren RR EO RUP So Uy 13 Pressure Ratings for Flange End Fittings in accordance with ASME B16 5 Standards 13 DIMENSIONS 4 4 eg er a e ak que EUR doe E A Arce 14 Meter DIM NSIONS s 96555 a Se ES ureta Kok OG RU A GU EGR Ce EMER TS Ae AC WCG p RRR 14 Monitor Dimensions s eee Rok CR AO NOE RUE CORO A al a ee 15 Page iv TRB UM 01798 EN 01 October 2015 Description and Use DESCRIPTION AND USE Blancett B1500 flow meters are precisely manufactured and calibrated instruments used in accurate rate of flow and total flow measurement The flow meter mounts directly in the flow line and consists of a cylindrically bored housing a flow straightener and turbine assembly and a magnetic pickoff as shown in Figure 1 The magnetic pickoff i
4. E Blancett Blancett Turbine Flow Meter Turbine Flow Meters B1500 Series Shown with Blancett B3000 Badger Meter TRB UM 01798 EN 01 October 2015 U se r M a n u a Turbine Flow Meter B1500 Series Page ii TRB UM 01798 EN 01 October 2015 User Manual CONTENTS Description and Uses aaea 2445062 ee de cea dues da adn da Oe ada be ead Aah ae ware aha Gu 5 Safety infornmatiOny lt sk ha daeseWekag eae bags REESE AG Eee dy I ESSE PER SC 6 Satety Symbol 44 1er 240 ieee eer goa WANS Vates Ae ed A TY quae a 6 Unpacking amp Inspection QR 6 installatioi 6 Meter Orientation i33 vs pa ae ee aS cae 6 PIPING Bde aa OW OP A eee MAE OE 6 Disassembly hte dans RIC 7 B1500 Ball Bearing a Seer ea eee eras PADS vasa Oe eux dU e ewes hues 7 Cleanitig esset yo IERI eee hs ETE E SIEHE ee RS 7 Cleaning a Turbine Meter after Water Calibration and or Service leen 7 Reassembly e AURORA ATE RR EU RR RR RR 8 Trotiblesho tlng ate ctn t o a ah aa ew Ae n e a eid ee AR Pea ee 8 Technical Term
5. October 2015 TRB UM 01798 EN 01 Page 13 Dimensions DIMENSIONS NPT End Fitting B150 750 NPT 3 4 in 19 1 mm 3 29 in 83 6 mm A Part Number End Fitting A B D B150 501 NPT 1 2 in 12 7 mm 2 70 in 68 6 mm 2 52 in 64 0 mm 1 12 in 28 5 mm Square Body 1 62 in 40 9 mm B150 502 NPT 1 2 in 12 7 mm 2 70 in 68 6 mm 2 52 in 64 0 mm 1 12 in 28 5 mm Square Body 1 62 in 40 9mm B150 503 NPT 1 2 in 12 7 mm 2 70 68 6 mm 2 62 in 66 5 1 12 in 28 5 mm Square Body 1 62 in 40 9 mm B150 625 NPT 3 4 in 19 1 mm 3 29 in 83 6 mm 2 62 in 66 5 mm 1 25 in 31 8 mm Square Body 1 75 in 44 5 mm 1 25 in 31 8 mm Square Body 1 75 in 44 5 mm B150 110 NPT 1 00 in 25 4 mm 3 78 in 96 0 mm 2 82 in 71 6 mm 1 63 in 41 4 mm Hex Body 2 72 in 69 1 mm B150 125 NPT 1 25 in 31 75 mm 4 23 in 107 4 mm 2 92 in 74 2 mm 1 88 in 47 8 mm Hex Body 2 38 in 60 5 mm B150 115 NPT 1 50 in 38 10 mm 4 67 in 118 6 mm 3 12 in 79 2 mm 2 25 in 57 2 mm Hex Body 2 75 in 69 9 mm B150 120 NPT 2 00 in 50 80 mm 5 89 in 149 6 mm 3 32 84 3 mm 2 75 in 69 9 mm Hex Body 2 75 in 69 9 mm 2 13 in 54 1 mm Flange End Fitting 2
6. RB UM 01798 EN 01 Page 5 Safety information SAFETY INFORMATION The installation of the Blancett B1500 flow meters must comply with all applicable federal state and local rules regulations and codes Failures to read and follow these instructions can lead to misapplication or misuse of the Blancett B1500 flow meters resulting in personal injury and damage to equipment Safety Symbol Explanations ADANGER INDICATES A HAZARDOUS SITUATION WHICH IF NOT AVOIDED IS ESTIMATED TO BE CAPABLE OF CAUSING DEATH OR SERIOUS PERSONAL INJURY INDICATES A HAZARDOUS SITUATION WHICH IF NOT AVOIDED COULD RESULT IN SEVERE PERSONAL INJURY OR DEATH INDICATES A HAZARDOUS SITUATION WHICH IF NOT AVOIDED IS ESTIMATED TO BE CAPABLE OF CAUSING MINOR OR MODERATE PERSONAL INJURY OR DAMAGE TO PROPERTY UNPACKING amp INSPECTION Upon opening the shipping container visually inspect the product and applicable accessories for any physical damage such as scratches loose or broken parts or any other sign of damage that may have occurred during shipment NOTE If damage is found request an inspection by the carrier s agent within 48 hours of delivery and file a claim with the carrier A claim for equipment damage in transit is the sole responsibility of the purchaser INSTALLATION Meter Orientation Blancett B1500 flow meters may be installed in any position without affecting performance Make sure the direction of flow is the same direction as the
7. arrow engraved on the flow meter body Piping Install a minimum of 10 pipe diameters of straight pipe or tube in the same size as the flow meter on the upstream side and 5 diameters on the downstream side to avoid creating turbulence in the liquid which can cause incorrect flow meter output If space prohibits the use of these straight sections install the piping to produce as straight and smooth a flow as possible BLEED ALL AIR AND VAPOR FROM THE LIQUID AFTER INSTALLING OR REINSTALLING A FLOW METER START FLOW SLOWLY TO AVOID SENDING A SLUG OF HIGH VELOCITY AIR OR VAPOR THROUGH THE FLOW METER AND CAUSING IT TO OVERSPEED START REQUIRED FLOW AFTER FLOW METER IS FULL OF LIQUID AERATED LIQUIDS FLOWING THROUGH A FLOW METER WILL RESULT IN INCORRECT FLOW RATES Page 6 TRB UM 01798 EN 01 October 2015 Disassembly DISASSEMBLY B1500 Ball Bearing Type 1 Firmly hold the flow meter and using tweezers carefully remove internal snap ring from the upstream end Use long nose pliers to grasp one vane of the flow straightener and gently pull the flow straightener and rotor assembly from the body Use a slight twisting motion Press down on the hub to relieve spring pressure on the C washer and remove with tweezers or thin nosed pliers Remove hub spring and spacer Carefully remove the rotor from the shaft N ey Remove the snap ring from the side of the bearing and push the bearing out of the rotor CLEANING Immerse all
8. emperature will result in decreased fluid velocity while lower temperature results in increased fluid velocity This change will cause a variation of the K factor that is supplied with the turbine flow meter Turbine flow meters calibrated at one temperature and operated at another require correction of their K factor Associated Equipment Electrical leads from the flow meter to remote associated equipment should be carefully chosen to be compatible with the flow meter output and the impedance values of the components used Distance between flow meter and associated equipment is then a negligible factor Use good quality coaxial cable or twisted pairs with or without shielding as required by environmental factors If a shielded lead is required it must not be grounded at the flow meter since neither pin of the standard pickoff is grounded Ground at some other point to eliminate ground loops in the associated equipment Page 10 TRB UM 01798 EN 01 October 2015 Calibration Data CALIBRATION DATA K Factor The calibration data supplied with a B1500 flow meter is shown in Figure 6 Correct application of a B1500 flow meter requires consideration of many important factors Because of the wide variation of possible applications detailed data for liquid flow models only is given in this manual For special requirements consult the factory Pressure Rating Flange flow meters are rated for service pressure according to ANSI ratings for the flang
9. es used Operation at temperatures above 200 F 93 C decreases the connection rating because of lowered stress capabilities of the metal Liquid Formula GPM Hertz x 60 PPH Hertz x 3600 x 8 328 S G K Engrg Units GPM PPH Hertz Time Base in Seconds Figure 5 Calculating flow rates in different units z3 Bisous Certificate of KS Blancett Blancett Ca bration Turbine Flow Meters SS 8635 Washington Ave Racine WI 53406 Phone 1 877 243 1010 Fax 1 800 245 3569 info blancett com Model B150 501 NPT Cal Date 9 9 2015 Serial PART REE Customer Re Cal Date Signal MAG Lab Temp 75 Deg F Calibration Procedure FDP 002 Lab Relative Humidity 27 Calibration Tech Eddie Fluid Specifications MIL C 7024 TY II Specific Gravity 0 762 Temperature F 80 Viscosity CSTKS 1 12 Notes Adjustments amp Repairs Tolerance Meet 0 5 Linearity from 0 2 3 0 GPM Nominal K Factor in GPM Calibration Results Initial Calibration Test Point Frequency Flow Rate Freq Vise K Factor Flow Rate Mass Flow Linear Hz GPM Hz cstk pul gal LPM PPH COEFF 1 2 3 4 5 6 it 8 9 10 Standards Used in Calibration Standard Description Serial ReCal Date FDI 180 30 GPM Liquid Prover NA 8 12 2018 FDI 180 Cart 30 GPM Cart mA Vdc Frequency Temp N A 6 2 2016 The instrument referenced ab
10. he right to change product or system specifications without notice except to the extent an outstanding contractual obligation exists 2015 Badger Meter Inc All rights reserved www badgermeter com The Americas Badger Meter 4545 West Brown Deer Rd PO Box 245036 Milwaukee WI 53224 9536 800 876 3837 414 355 0400 M xico Badger Meter de las Americas S A de C V Pedro Luis Ogaz n N 32 Esq Angelina N 24 Colonia Guadalupe Inn CP 01050 M xico DF M xico 52 55 5662 0882 Europe Middle East and Africa Badger Meter Europa GmbH Nurtinger Str 76 72639 Neuffen Germany 49 7025 9208 0 Europe Middle East Branch Office Badger Meter Europe PO Box 341442 Dubai Silicon Oasis Head Quarter Building Wing C Office C209 Dubai UAE 971 4 371 2503 Czech Republic Badger Meter Czech Republic s r o 2082 26 621 00 Brno Czech Republic 420 5 41420411 Slovakia Badger Meter Slovakia s r o Racianska 109 B 831 02 Bratislava Slovakia 421 2 44 63 83 01 Asia Pacific Badger Meter 80 Marine Parade Rd 21 06 Parkway Parade Singapore 449269 65 63464836 China Badger Meter 7 1202 99 Hangzhong Road Minhang District Shanghai China 201101 86 21 5763 5412
11. n B150 115 12 5 125 0 gpm 47 3 473 2 lpm 6 0 PSID 0 42 kg cm 576 US gal min 152 L min B150 120 25 250 0 gpm 94 6 946 4 lpm 6 5 PSID 0 46 kg cm 288 US gal min 76 L min Pressure drop is based on using MIL PRF 17024E Type Il at 77 25 C with a specific gravity of 0 77 K Factor will vary slightly from meter to meter Pressure Ratings NPT End Fittings Part Number Nominal Pipe Size Mals psig bar B150 501 NPT 0 25 in 6 4 mm 5922 408 B150 502 NPT 0 37 in 9 5 mm 4700 324 B150 503 NPT 0 50 in 12 7 mm 4418 305 B150 625 NPT 0 75 in 19 1 mm 4136 285 B150 750 NPT 0 75 in 19 1 mm 4136 285 B150 110 NPT 1 00 in 25 4 mm 4042 278 B150 125 NPT 1 25 in 31 8 mm 4700 324 B150 115 NPT 1 50 in 38 1 mm 4230 291 B150 120 NPT 2 00 in 50 8 mm 3666 253 NOTES 1 Pressure ratings listed are for temperatures up to 100 37 8 C 2 Pressure rating is calculated with an allowable stress value of 20 000 psi 1378 bar for 316 SS per pressure piping code ASME B31 3 3 Chartis displaying safe working pressure in accordance with power piping code ASME B31 1 Flange End Fittings in accordance with ASME B16 5 Standards ANSI Flange PSIG Bar 1504 275 19 NOTES 1 Specifications from maximum non shock allowable working pressure in psig at 100 F 37 8 C or less 2 Stainless steel 316A 181 material
12. oop is shielding Ground shield one place only Watch for internal electronic instrument grounds No flow indication full flow of fluid opened into dry meter impact of fluid on rotor causes bearing separation Fluid shock New bearing failed Move meter to position where it is full of fluid at start up Erratic indication at low flow good indication at high flow Low instrument sensitivity 10 mV rms turbine signal is being lowered by loading of electronics or instrumentation cannot sense low level signals Amplify signal No flow indication Faulty pickoff Replace pickoff recalibrate as necessary System works perfectly except indicates lower flow over entire range Bypass flow leak Eliminate bypass valves leak Faulty solenoid valves Meter indicating high flow upstream piping at meter smaller than meter Fluid jet impingement on rotor Critical in gas Change piping Opposite effects as above Viscosity lower than calibrated Change temperature change fluid recalibrate meter Mass flow indication wrong Turbine meter is volumetric density correction is electronic must change with temperature Wrong fluid density Critical in gas Check fluid electronics Erratic or wrong indication of flow Loose pickoff Tighten pickoff Indicates high flow two hours after installing new bearing Bearing wear in small meters critical Recalibrate 20 30 min run in is
13. ount This increased differential pressure can reduce the life of the bearing Reduction of maximum operating frequency to maintain design pressure drop results in reduced bearing life The maximum frequency can be approximately calculated as shown by the following example Maximum Frequency 1200 1 0 1 5 980 cps Figure 4 Calculating maximum frequency October 2015 TRB UM 01798 EN 01 Page 9 Factors Affecting Linearity Viscosity In a turbine meter the one factor that most affects the linear range is viscosity The skin friction viscous affect of the boundary layers on the blades of the rotor and adjacent surfaces is known to be function of the Reynolds number a dimensionless parameter At a sufficiently low Reynolds number the boundary layer is completely laminar At a high Reynolds number the boundary layer is turbulent In the transition region there is a gradual change from laminar to turbulent flow At low viscosities the Reynolds number is high so that at the minimum operating frequency the flow is still turbulent As the viscosity is increased the Reynolds number decreases and the meter at the same minimum frequency is operating in the transition region At this point the drag actually decreases and the K factor cycles per gallon increases A further increase in viscosity and the Reynolds number decreases to a point where the flow is completely laminal and the K factor decreases In effect as the viscosity increases
14. ove was calibrated using standards traceable to the National Institute of Standards and Technology Calibration reports for references maintained by Badger Meter Inc are available upon request to the customer of this calibration report The volumetric flow rates reported are within a best uncertainty of 037 of reading Represents an expanded uncertainty using a coverage factor k 2 at an approximate level of confidence of 95 and applies to calibration equipment only and 0 02 reading uncertainty of the UUT Unit Under Test I certify the accuracy of this Calibration Report Andrew Yee Calibration Engineer Name Title Signature End of Report Doc Nbr CRF 002 Rev G Report 195165 1509000019 Page 1 of 1 Figure 6 Calibration certification October 2015 TRB UM 01798 EN 01 Page 11 Recalibration RECALIBRATION Recalibration is not necessary following a cleaning operation or the replacement of bearings snap rings springs or spacers Recalibrate the flow meter if the rotor hub or rotor and flow straightener assembly is replaced Flow meters may be recalibrated by the user if the facilities are available or they may be returned to the factory Yearly calibration is recommended When the flow meter is set up for recalibration allow the fluid to circulate for 5 minutes before beginning the calibrating runs SPECIFICATIONS Accuracy 0 25 of reading Performance Repeatability
15. parts except the pickoff in a clean filtered solvent suitable for removing residue from the liquid used with the flow meter If necessary use a soft bristle brush If there is foreign matter in the ball bearings soak the bearings in the solvent for approximately 10 minutes and then dry with filtered compressed air Do not use excessive air pressure NOTE Do not sonic clean the bearings EXERCISE EXTREME CARE DURING THE CLEANING PROCESS SO NONE OF THE PARTS ARE DROPPED SCRATCHED OR DAMAGED IN ANY WAY DO NOT ATTEMPT TO FURTHER POLISH ANY OF THE PARTS ESPECIALLY THE ROTOR Cleaning a Turbine Meter after Water Calibration and or Service NOTE When cleaning flow meters keep the body sleeve and pickoff together The sleeve is fitted to the body and the pickoff has a protruding pin Replacement pickoffs are supplied with a nut and have no protruding pin Remove the meter from the line and let all excess water drip out Fill the meter with alcohol at least 50 Isopropyl Ethyl or Methyl and let it stand for 5 minutes Discard the alcohol and let the meter dry for 2 minutes Fill the meter with MIL C 7024 Type 2 calibration fluid or similar solvent and let it stand for 1 minute Discard the calibration fluid and flush the meter with an approved fluorocarbon solvent such as Isotron NOTE If this procedure is not possible make sure the turbine meter is always filled with water when not in use to prevent internal wetted
16. parts from being exposed to air ACAUTION Figure 2 B1500 turbine flow meter DO NOT INTERCHANGE FLOW METER PARTS OTHER THAN BEARINGS AND RETAINING RINGS THIS PRECAUTION IS NECESSARY TO PRESERVE LINEARITY AND REPEATABILITY October 2015 TRB UM 01798 EN 01 7 Reassembly REASSEMBLY Reassembly is the reverse of disassembly except for the following flow meters where shaft bearings are provided with a retainer always install with the retainer flange facing upstream Inspect the rotor for markings as shown in Figure 3 to indicate flow direction before assembly Flow meters that have broached slots in the body for flow straightener vanes should be carefully assembled Align the straightener vanes with the slots and push gently until the assembly is seated TROUBLESHOOTING 2 Scribed lines Downstream Side Figure 3 Scribed lines Issue Possible Cause Remedy Meter indicates higher flow than actual Cavitation Increase back pressure Meter indicates high flow Dirt blocking flow area rotor Clean meter add filter Meter indicates low flow Dirt dragging rotor Clean meter add filter Meter indicates low flow Worn bearing Replace bearing recalibrate when required Meter indicates low flow Viscosity higher than calibrated Change temperature change fluid recalibrate meter Erratic system indication meter alone works well Ground l
17. required to stabilize friction Cannot reach maximum flow rate meter selection was with Delta P at 0 75 sp gr now using on 1 0 sp gr Delta P is proportional to specific gravity High pressure drop Install larger meter Does not repeat at low flows repeats at high flows System resolution readability Increase resolution for example 1 out of 100 196 1 out of 1000 0 1 Page 8 TRB UM 01798 EN 01 October 2015 Technical Terms TECHNICAL TERMS K Factor K is a letter used to denote the cycles per gallon factor of a flow meter This factor is a fixed value used in resolving or totalizing the pulse count output of a flow meter It results from the equation Cycles per second Gallons per second Cycles per gallon K Repeatability The maximum deviation from the corresponding data points taken from repeated tests under identical conditions Linearity The deviation from the mean calibration factor K expressed as being within a certain tolerance FACTORS AFFECTING LINEARITY Size The size of the meter selected is determined by the flow range required and the fluid characteristics Standard flow ranges are listed in Flow Ranges on page 13 Where range requirements fall between the listed ranges use two meters or you can order a meter for the specific range required Overspeeding to meet a required flow capacity results in lowered operating life Going to a larger meter size to avoid o
18. s cues aur Rea REED AREER OD RUE Ropa dU CR LR ee 9 Qro E E 9 Repeatability sc 5 hace y pe E fia Pak aggeWe dae se RES QS QU IESUS qae 9 LINGANIEY o d ase oy BAe er ouv a T Y ES OE QE OE 9 Factors Affecting linearity ars dy cane 9 SIZE rr 9 Bearings 005 ce ok wade TEA Ce ESHER QR KG X EG PG QEON GR ORA CH ERE ES REOR RETARD ES RE EE 9 PICK OMNIS 9 ah ea 9 Mounting for Calibrations sso oS A RET UR OR RR A REG Re mes 10 Pressure Drops s sw ap DR ROGO RR CR RR RRR LAA RE RES RRA Re UON 10 Specifie Gravity obs ae a ee OO C UR Wa NR E ned V net E De RO e ue es 10 55 10 Iur PTT 10 Associated Equipment uasa gu ace RR PR RUEGUEGU UP UP RUE UR GG X p RR RU Ra xe p 10 Calibration Data 4 sanse eco oer does Aaaa eros s eon kd Ae i oh s os d dos Bare 11 xx x opp UR Ue UR da Whee eRe TA UR UE TG ER SEARED VUE RO NOR KCR KON 11 P essureRatlg idi doe
19. s located directly above the turbine near the downstream end of the flow meter The flow straightener and turbine assembly is retained in the housing by a snap ring and can be easily removed for cleaning and further disassembly Figure 1 Turbine flow meter Blancett B1500 flow meters are provided with flow straighteners at the downstream and upstream ends The flow straighteners diminish any turbulence created by the turbine Other physical differences are illustrated in exploded views See Figure 1 Fluid passing through the meter causes the rotor and bearing to revolve at a speed directly proportional to fluid velocity As each rotor blade passes the pickoff it varies the pickoff s reluctance producing an output signal Since turbine speed is directly proportional to fluid velocity signal frequency is similarly proportional to the volumetric rate of flow The output signal can be fed into various types of instruments such as indicators frequency converters counters recorders and controllers to indicate the rate of flow The Blancett B1500 flow meter is designed to provide a high frequency output voltage at the maximum of their flow range This high frequency signal improves resolution and the standardized output permits several overlapping range flow meters to be connected in series to one indicating instrument Data concerning extended ranges specific output voltage and other frequency ranges is available from the factory October 2015 T
20. the range in which the flow is turbulent decreases In low capacity flow meters the viscosity effect may be of such an order that the entire flow range will be in the laminar flow region Mounting for Calibration Turbine flow meters are calibrated with the axis horizontal and the pickoff on top Flow meters with ball bearings may be mounted in any attitude with nil affect on the linearity range or calibration Pipe configuration such as valves tees and elbows immediately preceding the meter can produce swirl in the fluid with erroneous results Install a minimum of 10 diameters of tubing the same size as the meter Pressure Drop Pressure drop across turbine flow meters is substantially constant for a given gravimetric flow rate but varies in approximate proportion to the square of the volumetric flow rate This variation is proportional to a liquid s density The values shown under range characteristics are based on a liquid specific gravity of 0 760 and a viscosity of 1 centistoke Specific Gravity Changes in the specific gravity of a liquid in a linear shift in gravimetric calibration can be plotted as a function of specific gravity These changes have no measurable effect on the volumetric flow rate but will cause a shift in the pressure drop across the flow meter Pressure Pressure changes have no measurable effect on volumetric flow rates Temperature Large temperature changes cause an area change within the flow meter Higher t
21. verspeeding results in the non linear range at the lower flow rates Bearings The rotor in a standard meter is mounted on ball bearings The function of rolling friction in regard to linear operating range is nil and can be disregarded Pickoffs Magnetic pickoffs affect the linear range of a meter due to magnetic drag on the rotor Since the turning force available is a function of the total mass flow the low capacity meters are more affected at the minimum flow rate than the high capacity meters Replacement pickoffs should have the same part number as original equipment otherwise the linear range can be affected Fluids There are two types of fluids compressible and incompressible Considering only the incompressible liquids there are three factors that affect the linear flow range They are lubricity density and viscosity Lubricity This is not a measurable quantity It is that property of a that determines the friction within the bearing and affects the life of the bearing as well as the linear operating range Lack of lubricity can cause erratic action especially at the low end of the flow range Density Turbine flow meters are designed to operate over the standard frequency range with liquids of 1 0 specific gravity If a liquid of 1 5 specific gravity is used it will have a 5096 increase in driving force available at a given frequency Also the differential pressure of the meter is increased a like am
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