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Kurz 452 Series User Manual

Insertion flow element
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Kurz Instruments Inc.
Kurz Instruments, Inc.
Series 452
Insertion Flow Element User Guide
360195 Rev. B
covers
Models 452, 452T, 452P & 452PT
March 1998
KURZ INSTRUMENTS INC
2411 GARDEN RD
MONTEREY CA 93940-5394
USA
Telephone: 408 (831 after July 98)-646-5911
FAX: 408 (831 after July 98)-646-8901
www.kurz-instruments.com
452 User Guide
360195 Rev. B
i

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  • Page 1 Kurz Instruments Inc. Kurz Instruments, Inc. Series 452 Insertion Flow Element User Guide 360195 Rev. B covers Models 452, 452T, 452P & 452PT March 1998 KURZ INSTRUMENTS INC 2411 GARDEN RD MONTEREY CA 93940-5394 Telephone: 408 (831 after July 98)-646-5911 FAX: 408 (831 after July 98)-646-8901 www.kurz-instruments.com...

  • Page 2: Publication Notices

    Every effort has been made to supply complete and accurate information to the customer. However, Kurz Instruments, Inc. assumes no responsibility for its use, nor any infringements of patents or other third parties which would result. In addition, Kurz Instruments, Inc. makes no representations or warranties of any kind concerning the contents of this publication.
  • Page 3 Kurz Instruments Inc. and customers, whether direct or indirect, harmless from and against any and all losses, damages, or expenses of whatever form and nature (including attorneys fees and other costs of defending any action) which they, or any of them, may sustain or incur, whether as a result of breach of contract, warranty, tort (including negligence), strict liability or other theories of law, by reason of such use.

  • Page 4: Warranty

    Factory in Monterey, CA. The Customer is responsible for the construction materials’ selection and for the materials’ suitability with the intended use of Kurz equipment. The Company shall not be liable for installation charges,...

  • Page 5: Table Of Contents

    Kurz Instruments Inc. TABLE OF CONTENTS PUBLICATION NOTICES ..........ii COPYRIGHT .
  • Page 6 Correction Factors ..........A6 Use Of The Flow Equations In The KURZ Mass Flow Computer ..A6 Single Point Insertion Flow Elements .

  • Page 7: Introduction

    Kurz Instruments Inc. INTRODUCTION The Kurz Instruments 452 series of insertion mass flow elements are point velocity sensing devices. The flow element is a constant temperature thermal anemometer which intrinsically measures the process fluid Reynolds number. The net meter response is mass rate per unit area. The flow element is half of a two part flow transmitter.

  • Page 8: Duct Velocity Profile Correction

    - Does the fluid change phase? - Can material build up on the sensor? Answers to many of these question can be found in this manual or its appendices. Kurz customer service may also be contacted for assistance 408 (831 after July 98)-646- 5911 or FAX 408 (831 after July 98)-646-1033.

  • Page 9: Installation

    The 452 insertion flow element is generally mounted with a compression fitting into a duct or on a flange (See Figure 1). See the product brochure (DCN 367027) for Kurz mounting accessories and a general outline drawing. Model specific outline drawings are available via request to the customer service department.

  • Page 10: Field Wiring

    80 °C for example. Field Wiring There are up to three issues for the proper wiring installation of the Kurz 452x: Safety Grounding and Explosion Proof enclosure connections. Signal/power wiring and of the optional 4-20 mA temperature signal.

  • Page 11: Transmitter Separate (Ts) Configurations

    Peripherally bonded shielded cable glands are required for cable connections. Hawk, makes a whole line of cable glands for shielded cable, some have explosion proof ratings too. Please contact Kurz Instruments, Inc. Customer Service if you need information in this area or other aspects of the installation.

  • Page 12: Optional Power-On Surge Check

    Kurz Instruments Inc. 600 Kenrick Suite C-10 Houston Texas 77060 United States of America Tel: +1 281 445 7400 Fax: +1 281 445 7404 E-mail: hawke@hawkeusa.com http://www.offshore-technology.com/contractors/cables/hawke/index.html Optional Power-On Surge Check Once the mechanical and electrical installation is complete and checked you may safely apply power.

  • Page 13: Insertion Flow Element Calibration

    Kurz Instruments Inc. INSERTION FLOW ELEMENT CALIBRATION Factory Calibration Method Two methods of velocity calibration are used depending on the gas type to be calibrated. For air calibrations and gas correlations a transfer standard is used where the unit under calibration and the standard are in the same plane perpendicular to the flow.

  • Page 14: Tracer Dilution

    Kurz Instruments Inc. Tracer Dilution Kurz Instruments offers insitu flow calibrations which account for all the profile issues etc. Here the tracer injection flow rate is measured at a know injection concentration, the diluted concentration is then measured with an analyzer and the unknown flow is then calculated.
  • Page 15 This calibration is traceable to National Institute of Standards and Technology Test No.836/256043-95 Purchase Order No. P16641 and meets the requirements of ISO 10012-1 and ANSI/NCSL Z540-1. This calibration was performed per Kurz Doc. No. 760017. John Doe DATE : 11-1-96 WIND TUNNEL OPERATOR:...
  • Page 16 Kurz Instruments Inc. 452 User Guide 360195 Rev. B...

  • Page 17: Maintenance And Troubleshooting

    Kurz Instruments Inc. MAINTENANCE AND TROUBLESHOOTING Maintenance The thermal anemometer has no moving parts so there is not too much to the maintenance except cleaning and inspection for corrosion and environmental damage. When an application is first started or changes the sensor should be inspected for dirt build up and a cleaning schedule established as required.

  • Page 18: Flow Issues

    Accuracy requires field calibration. To avoid this field calibration issue, the Kurz 502 line will provide an accurate “out of the box” calibration. You must follow the guidelines to avoid flow disruptions from being too close to the element.

  • Page 19: Troubleshooting Chart

    Kurz Instruments Inc. TABLE 2 TROUBLESHOOTING CHART Symptom Possible Reasons No CSV signal - Loss of power - Reversed polarity leads - Bridge Board Defective. See Note 1. Output Signal “motor boating” - Sensor has too much leakage current, corrosion or water damage...
  • Page 20 Kurz Instruments Inc. Calibration is too high. - Have sensor blockage & flow profile effects been accounted for? This is a significant factor in ducts measuring less than 1ft². - Is the sensor oriented to the flow correctly? - Was the unit calibrated for the gas type...
  • Page 21 This is a 3/4 A fast blow fuse which is surface mounted. It is removed by heating with a soldering iron one end and lifting it up from that end at the same time. Then the other side is unsoldered. This fuse is Pico part number R459.750 or Kurz stock number 630051.

  • Page 22: Return Shipment

    Billing contact’s name and phone # Complete shipping address Complete billing address You will then be issued an RMA #. Kurz personnel will refuse to accept return material shipments if an RMA # is not visible on the outside surface of the shipping container.
  • Page 23 RMA # clearly marked on the outside surface of the container. Kurz personnel will refuse to accept return material shipments if an RMA # is not visible on the outside surface of the shipping container.

  • Page 24: Thermal Anemometer Measurements

    APPENDIX A THERMAL ANEMOMETER MEASUREMENTS The KURZ thermal anemometers use two RTDs, one heated 50 to 100 °C above the ambient, the other monitors the ambient. The current required to keep the velocity element heated is the parameter calibrated in our wind tunnels.

  • Page 25: Standard Velocity

    Kurz Instruments Inc. For example: ρ is kg/m , v is m/s so ρv is (kg/s)/m The sensor is sensitive to the energy that the gas molecules hitting it take away in the form of heat. This energy is proportional to the size and number of molecules that hit the sensor.

  • Page 26: Mass Flow

    Kurz Instruments Inc. Mass Flow is obtained by simply multiplying the Standard Volumetric Flow by the Standard Density. MASS Flow = (Standard Volumetric Flow) x ρ =Aρv The units here are mass/time (kg/s) Typical units are: PPH, Pounds per Hour KGH, Kilograms per Hour Different gases have different standard densities.
  • Page 27 Kurz Instruments Inc. There are secondary effects which cause mistracking of the ideal thermal anemometer. Pressure changes will affect the calibration for some gasses. For example, N has a large 2.5% /100 psi shift in its viscosity which changes its mass flow reading the same amount.

  • Page 28: Flow Profiles And Correction Factors

    Kurz Instruments Inc. Flow Profiles And Correction Factors. At low velocity, a laminar velocity profile develops across the pipe cross section as shown in the figure. Note that the peak velocity is about 30% higher than the velocity average (Va).

  • Page 29: Correction Factors

    CD sensor. For other sized ducts, the data can be scaled by the Reynolds Number. Use Of The Flow Equations In The KURZ Mass Flow Computer Single Point Insertion Flow Elements like the 410, 450, 452 are calibrated as velocity devices in gas X.

  • Page 30: Multi Point Insertion Flow Elements

    Kurz Instruments Inc. Multi point Insertion Flow Elements (K-BAR) are also calibrated as velocity devices in gas X. You can display standard velocity or with application specific information you can display standard volumetric flow and mass flow: Area, Sensor and probe support blockage Correction factor (velocity profile).
  • Page 31 What is mass flow in SCFM ____________________________________ What is velocity in SFPM ______________________________________ The actual velocity is _________________________________________ What range does Kurz calibrate to _______________________________ Nitrogen flow of 10 ACFM through a 3" Schedule 40 pipe, 110ºF, 50 PSIG What is the area ______________________________________________...
  • Page 32 Kurz Instruments Inc. Major Points to Remember ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ __________________________________________ 452 User Guide 360195 Rev. B...

  • Page 33: Theory And Application Of Kurz Thermal Convection Mass

    Kurz Instruments Inc. APPENDIX B THEORY AND APPLICATION OF KURZ THERMAL CONVECTION MASS FLOW METERS, DCN 364003 452 User Guide 360195 Rev. B...

  • Page 34: Product Approvals

    Kurz Instruments Inc. APPENDIX C PRODUCT APPROVALS The CE declaration of EMI compliance for this product and hazardous area approvals are found in this appendix. 452 User Guide 360195 Rev. B...

  • Page 35: Declaration Of Ce Compliance

    Kurz Instruments Inc. Declaration of CE Compliance, File 430007b.wpd printed on Kurz letter head signed by Jerry. 452 User Guide 360195 Rev. B...

  • Page 36: Hazardous Area Product Approvals

    Hazardous Area Product Approvals Explosion Proof: Series 452 and 452T CSA File LR 87908-5 300 PSI Maximum Process Pressure. Explosion Proof For Class I, Zone 1, Group IIB +H , T3 or Class I, Division 1, Groups B, C &D, Temperature Rating T3.

  • Page 37: Recommended Sensor Placement Criteria And Sensor Flow Blockage Correction Factors For Series 450 Single-Point Mass Flow Elements

    APPENDIX D RECOMMENDED SENSOR PLACEMENT CRITERIA AND SENSOR FLOW BLOCKAGE CORRECTION FACTORS FOR SERIES 450 SINGLE-POINT MASS FLOW ELEMENTS DR. JERRY KURZ PRESIDENT KURZ INSTRUMENTS, INC. 12-12-95 DCN 364002 REV.B 452 User Guide 360195 Rev. B...

  • Page 38: Introduction

    The purpose of this technical note is to assist our customers to use our products in the most advantageous manner in the interests of accuracy, cost, maintenance and reliability. For several years most suppliers, including Kurz, have recommended placing the centerline of the thermal sensor at the center of circular pipes. However, the velocity...

  • Page 39: Recommended Sensor Placement Criteria

    For small pipes, or when higher accuracy is required, a Kurz In-Line Mass Flow Element is recommended. For pipes having an inside diameter of 2.50 inches to 3.0 inches, place the centerline of the sensor at 1.50 inches from the inner wall of the pipe.

  • Page 40: Sensor Blockage Correction Factors

    Kurz Instruments Inc. III. SENSOR BLOCKAGE CORRECTION FACTORS: This section provides equations to enable the user to calculate a Sensor Blockage Correction Factor (SBCF) that may easily be entered into the Series 155 Mass Flow Computer. The effect of the frontal area of the sensor on the indicated velocity in a small pipe is to increase the average velocity within the pipe.
  • Page 41 Kurz Instruments Inc. TABLE I, SERIES 450 SENSOR BLOCKAGE CORRECTION FACTORS Pipe I.D. 450-08, 452-08, etc. 450-16, 452-16, etc. 450T-16, 450PT-16, etc. (½" support, FD Sensor) (1" support, FD Sensor) (1" support, FDT Sensor) 2.5-3" -.894 -1.356 -1.414 3" - 12"...

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