Sierra Top-Trak 820 Series Instruction Manual
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Sierra Top-Trak 820 Series Instruction Manual

Mass flow meters
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Series 820 Instruction Manual
Table of Contents
Sierra 820 Series
ª
Top-Trak
Mass Flow Meters
Instruction Manual
Part Number IM-82
Revision C 06-99
5 Harris Court, Building L Monterey, CA 93940
(831) 373-0200 (800) 866-0200
Fax (831) 373-4402
http://www.sierrainstruments.com
Sierra Instruments b.v. Bolstoen 30A 1046 AV Amsterdam The Netherlands
+31(0)20-6145810 Fax +31(0)20-6145815
IM-82-C
0-1

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  • Page 1 Mass Flow Meters Instruction Manual Part Number IM-82 Revision C 06-99 5 Harris Court, Building L Monterey, CA 93940 (831) 373-0200 (800) 866-0200 Fax (831) 373-4402 http://www.sierrainstruments.com Sierra Instruments b.v. Bolstoen 30A 1046 AV Amsterdam The Netherlands +31(0)20-6145810 Fax +31(0)20-6145815 IM-82-C...
  • Page 2 Series 820 Instruction Manual Customer Notice Sierra Instruments, Inc. is not liable for any damage or personal injury, whatsoever, resulting from the use of Sierra Instruments standard mass flow meters or control- lers for oxygen gas. You are responsible for determining if this mass flow meter or controller is appropriate for your oxygen application.

  • Page 3: Table Of Contents

    Series 820 Instruction Manual Table of Contents Table of Contents Chapter 1 Introduction Introduction.............1-1 Using this Manual ..........1-1 Safety Information..........1-2 Receipt of System Components........1-2 Technical Assistance ..........1-2 Top Trak Features............1-3 The 820 Series Flow Sensing Principle ......1-4 Chapter 2 Installation Installation Overview ..........2-1 Installing the Transducer ..........2-2 Compression Fittings ..........2-2...
  • Page 4 Table of Contents Series 820 Instruction Manual Appendix A Conversion Formulas and Gas Tables Appendix B Production Specifications List of Figures 1-1. Top-Trak Features (Typical)........1-3 1-2. Flow Paths through the Transducer......1-4 1-3. Flow Measuring Principle........1-4 2-1. Piping Requirements for 1/2-inch Size Connections..2-3 2-2.
  • Page 5 Series 820 Instruction Manual Table of Contents Cautions Caution! Only qualified personnel should install the transducer. Caution! Do not supply +DC power at the D-connector while using a power supply at the power jack. Both supplies may be damaged. Caution! Operating a 12 VDC transducer at 24 VDC will cause equipment damage. Caution! Only qualified personnel should perform transducer service, calibration or troubleshooting procedures.
  • Page 6 Table of Contents Series 820 Instruction Manual IM-82-C...

  • Page 7: Chapter 1 Introduction

    Series 820 Instruction Manual Chapter 1 Introduction Chapter 1 Introduction This instruction manual covers the installation, operation and main- tenance of SierraÕs 820 Series product line including the following ª Top-Trak Models: · 822 Mass Flow Meter with display (nylon flow body) ·...

  • Page 8: Safety Information

    If the problem persists after following the troubleshooting procedures outlined in Chapter 4, contact Sierra Instruments by fax or by E-mail (see inside front cover). For urgent phone support you may call (800) 866-0200 or (831) 373-0200 between 8:00 a.m. and 5:00 p.m. PST.

  • Page 9: Top Trak Features

    Series 820 Instruction Manual Chapter 1 Introduction Top-Trak Features Standard Top-Trak Mass Flow Meters require a 12 to 15 VDC exter- nal power source (24 VDC input power optional). The transducerÕs 0 to 5 VDC output signal allows for flow recording, data-logging or control.

  • Page 10: The 820 Series Flow Sensing Principle

    Chapter 1 Introduction Series 820 Instruction Manual The 820 Series Flow Sensing Principle The operating principle of Top-Trak transducers is based on heat transfer and the first law of thermodynamics. During operation process gas enters the instrumentÕs flow body and divides into two flow paths, one through the sensor tube, the other through the lami- nar flow element bypass.

  • Page 11: Chapter 2 Installation

    Series 820 Instruction Manual Chapter 2 Installation Chapter 2 Installation Installation Overview To ensure a successful installation, inlet and outlet tubing should be clean and free from burrs or rims caused by cutting prior to plumb- ing the transducer into the system. The protective caps covering the inlet/outlet fittings should not be removed until immediately prior to installation.

  • Page 12: Installing The Transducer

    Chapter 2 Installation Series 820 Instruction Manual Installing the Transducer Follow the installation instructions that apply to your transducer’s process connection. For all 1/2-inch size process connections, observe Caution! the piping recommendations given on page 2-3. Before operation, all Only qualified plumbing should be checked carefully for leaks and the transducer personnel should install purged with dry nitrogen.
  • Page 13 Series 820 Instruction Manual Chapter 2 Installation 1/4 Inch Female NPT (standard on nylon flow bodies) 1. Position the transducer with the flow direction arrow pointing downstream in the direction of flow. 2. Use a good quality paste pipe thread sealant. Apply to the pipe threads.

  • Page 14: Wiring The Transducer

    Chapter 2 Installation Series 820 Instruction Manual Wiring the Transducer ™ Standard Top-Trak transducers require a 12 to 18 VDC power supply (15 VDC nominal, 100 mA maximum). 24 VDC input power is optional. Transducers are connected to the power supply through Caution! either the dedicated DC power jack or through the 9-pin D-connector Do not supply +DC power...

  • Page 15: Standard 0-5 Vdc Output Signal Wiring

    Series 820 Instruction Manual Chapter 2 Installation Standard 0-5 VDC Output Signal Wiring The standard 0-5 VDC output signal flows from Pin 3 (0-5 VDC Out) through the load (1K Ohm minimum) to Pin 7 (Power Com- mon). The figure below is a typical example of input power and output signal connections.

  • Page 16: Remote Display Installation

    Chapter 2 Installation Series 820 Instruction Manual Figure 2-5. Multiple Transducer Current Loop Connections Remote Display Installation Mount the remote display at a convenient location within reach of the supplied interface cable. The maximum cable length is 100 feet (30 m). Figure 2-6.

  • Page 17: Chapter 3 Operation

    Series 820 Instruction Manual Chapter 3 Operation Chapter 3 Operation The output signal of the transducer is either 0-5 VDC (standard) or 4-20 mA (optional). The output signal is linear and proportional to the gas mass flow rate. For example, for a 0-5 VDC output signal, 5.00 VDC is the output signal for the full scale listed on the trans- ducer’s nameplate, 2.50 VDC is for one-half of full scale, and 0.00 VDC is for zero flow.

  • Page 18: Referencing The Transducer To Non-Standard Conditions

    Chapter 3 Operation Series 820 Instruction Manual Referencing the Transducer to Non-Standard Conditions The gas flow rate output of your transducer is referenced to “standard” conditions of 21°C (70°F) and 760 mm of mercury (1 atmosphere) unless otherwise specified on the certificate of calibration. Check the stated reference conditions of your transducer.

  • Page 19: Zero And Span Adjustments

    Series 820 Instruction Manual Chapter 3 Operation Zero and Span Adjustments The zero and span potentiometers are accessed through the ports marked on the side of the transducer. Normally, span adjustments are not made unless you are calibrating the transducer. The span adjustment should not be used unless you have a known, precise non- zero flow rate that you wish to match.
  • Page 20 Chapter 3 Operation Series 820 Instruction Manual IM-82-C...

  • Page 21: Chapter 4 Maintenance And Repair

    Caution! ultrasonically cleaned. It is important that this transducer be serviced Calibration of Sierra Instruments flow meters and controllers re- and/or calibrated by quires a calibrating standard of at least equal accuracy and preferably qualified personnel. an order of magnitude better than the transducer, and a skilled fac- tory technician familiar with the Top-Trak.

  • Page 22: Flow Path Cleaning Model 822/824

    Chapter 4 Maintenance & Repair Series 820 Instruction Manual Flow Path Cleaning Model 822/824 Figure 4-1. Model 822/824 Flow Components Inlet and Outlet Screens 1. Remove the transducer from the system. 1. Remove inlet and outlet fittings. Caution! When using toxic or cor- 2.

  • Page 23: Laminar Flow Element

    Series 820 Instruction Manual Chapter 4 Maintenance & Repair Laminar Flow Element The laminar flow element (LFE) is a precision flow divider which diverts a preset amount of flow through the sensor tube. The LFE is made of precision machined 316 stainless steel. The particular LFE used depends on the gas and flow range of the instrument.

  • Page 24: Flow Path Cleaning Model 826/827

    Chapter 4 Maintenance & Repair Series 820 Instruction Manual Flow Path Cleaning Model 826/827 Laminar Flow Element The laminar flow element (LFE) is a precision flow divider which diverts a preset amount of flow through the sensor tube. The par- ticular LFE used depends on the gas and flow range of the instru- ment.

  • Page 25: Flow Path Cleaning Model 822-S/824-S

    Series 820 Instruction Manual Chapter 4 Maintenance & Repair Flow Path Cleaning Model 822-S/824-S Laminar Flow Element The laminar flow element (LFE) is a precision flow divider which diverts a preset amount of flow through the sensor tube. The LFE is made of precision machined 316 stainless steel.
  • Page 26 Chapter 4 Maintenance & Repair Series 820 Instruction Manual Figure 4-5. Medium Flow Transducer LFE Cleaning Medium Flow Transducers: In the medium flow body, the LFE assembly consists of the honey- comb laminar flow element, inlet screen, 0.63 inch long standoff, two ranging washers, 2-1⁄4 inch long 4-40 screw and 4-40 nut.
  • Page 27 Series 820 Instruction Manual Chapter 4 Maintenance & Repair Figure 4-6. High Flow Transducer LFE Cleaning High Flow Transducers: The high flow LFE is similar to the honeycomb element used in the medium flow body but larger in diameter. The high flow body consists of four parts: inlet tube, inlet cap, main flow body and end cap.

  • Page 28: Sensor Cleaning And Inspection

    Sensor cleaning is accomplished by simply rodding out the sensor with the Sensor Cleaning Stylette, part number “CK” available from Sierra. A 0.028 inch diameter piano wire may also be used. To access the sensor for inspection or cleaning: 1. Remove the transducer from the system. Remove the two socket Caution! head access port plugs with a 1⁄4-inch Allen wrench.

  • Page 29: Transducer Calibration

    Transducer Calibration Calibration of Sierra’s flow meters requires a calibration standard of at least four times the accuracy of the transducer. Sierra’s Cal-Bench Automated Primary Calibration System is the preferred method of calibration and is used at the factory for all calibrations from 10 sccm...
  • Page 30 Chapter 4 Maintenance & Repair Series 820 Instruction Manual Step 4. Adjusting Linearity First gain access to the printed circuit board inside the enclosure: 1. For units with the digital display, carefully rotate the display un- til it hits the top plate. Slide the display’s two side panels up and remove.

  • Page 31: Transducer Troubleshooting

    Series 820 Instruction Manual Chapter 4 Maintenance & Repair Transducer Troubleshooting When you suspect that the transducer is not operating correctly, there are a few simple checks that can be made before taking the unit out of service: 1. Make certain that there are no leaks in the gas line. 2.

  • Page 32: Returning Equipment To The Factory

    Prices may vary depending on the flow range, type of gas and operating pressure of your unit. To request detailed pricing con- tact your local Sierra Instruments distributor or contact one of our offices directly. Our expedite fees are: three-day turnaround 25%, two-day turn- around 40%.
  • Page 33 Material Safety Data Sheet (MSDS) must be enclosed & attached to the outside of the box to alert Sierra personnel of the potential hazard. Also, make sure the inlet & outlet are solidly plugged off.
  • Page 34 Series 820 Instruction Manual Appendix A Appendix A Conversion Formulas and Gas Tables Conversion of Flow Rate to Other T and P Conditions The flow rate of your transducer is referenced to certain ÒstandardÓ conditions of temperature and pressure. Unless otherwise specified in your order, these standard conditions are 21°C (70°F) and 760 mm of mercury (1 atmosphere).
  • Page 35 Appendix A Series 820 Instruction Manual Calculating For a Single Gas The following tables provide K-factors and thermodynamic proper- ties of gases commonly used with mass flow meters and controllers. The purpose of these tables is two-fold: 1. Calibrating an ÒactualÓ gas with a reference gas. This is particu- larly useful if the actual gas is not a common gas or if it is toxic, flammable, corrosive, etc.
  • Page 36 Series 820 Instruction Manual Appendix A Where: The constant amount of heat applied to the sensor tube, ¥ m = The mass flow rate of the gas (gm/min) Cr = The coefficient of specific heat of the gas (Cal/gm); Cr is given in the Table (at 0°C), DT = The temperature difference between the downstream and upstream coils, and A correction factor for the molecular structure of the gas...
  • Page 37 The value from the tables is preferred because in many cases it was obtained by experiment. Sierra calibrates every transducer with primary standards using the actual gas or a molecular equivalent reference gas. The cali- bration certificate accompanying the transducer cites the reference gas used.
  • Page 38 Series 820 Instruction Manual Appendix A Calculating Dual Gas Mixtures Equation (6) is used for gas mixtures, but we must calculate N/rC for the mixture. The equivalent values of r, C , and N for a dual gas mixture are given as follows: The equivalent gas density is: r = ( ) + (...
  • Page 39 Appendix A Series 820 Instruction Manual Gas Tables and K-factors Chemical K-factor Density Elastomer Actual Gas Symbol Relative N2 (Cal/g) (g/l) @ 0°C O-ring* Acetylene .4036 1.162 1.00 .240 1.293 Allene (Propadiene) .352 1.787 Ammonia .492 .760 Argon 1.45 .1244 1.782 Arsine .1167...
  • Page 40 Series 820 Instruction Manual Appendix A Chemical K-factor Density Elastomer Actual Gas Symbol Relative N2 (Cal/g) (g/l) @ 0°C O-ring* Dichloromethylsilane .1882 5.758 SiCl Dichlorosilane .150 4.506 Dichlorotetrafluoroethane .1604 7.626 (Freon-114) 1,1-Difluoroethylene .224 2.857 (Freon-1132A) Dimethylamine .366 2.011 Dimethyl Ether .3414 2.055 2,2-Dimethylpropane...
  • Page 41 Appendix A Series 820 Instruction Manual Chemical K-factor Density Elastomer Actual Gas Symbol Relative N2 (Cal/g) (g/l) @ 0°C O-ring* Methyl Mercaptan .2459 2.146 Methyl Trichlorosilane ) SiCl .164 6.669 Molybdenum Hexafluoride .1373 9.366 Monoethylamine .387 2.011 Monomethylamine .4343 1.386 Neon 1.46 .245...
  • Page 42 Series 820 Instruction Manual Appendix B Specifications Appendix B Product Specifications Operating Specifications Gases Most gases; check compatibility with wetted materials; specify when ordering Mass Flow Rates Models 822/824: 0 to 10 sccm to 0 to 50 slpm; Models 826/827: 0 to 75 slpm to 0 to 175 slpm; Models 822-S/824-S: 0 to 10 sccm to 0 to 500 slpm;...
  • Page 43 Appendix B Specifications Series 820 Instruction Manual Performance Specifications Accuracy ±1.5% of full scale including linearity over 15 to 25°C and 5 to 60 psia (0.3 to 4 bara) Repeatability ±0.5% of full scale Temperature Coefficient 0.08% of full scale per °F (0.15% of full scale per °C), or better Pressure Coefficient 0.01% of full scale per psi (0.15% of full scale per bar), or better Response Time...
  • Page 44 Series 820 Instruction Manual Appendix B Specifications IM-82-C...
  • Page 45 Appendix B Specifications Series 820 Instruction Manual IM-82-C...

This manual is also suitable for:

Top-trak 822Top-trak 824Top-trak 826Top-trak 827Top-trak 822-sTop-trak 824-s

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