Manuale d’uso / di manutenzione del prodotto 780S del fabbricante Sierra
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Series 780S Instruction Manual Table of Contents IM-78S-B 0-1 Sierra 780S Series Flat-Trak ™ Mass Flow Meter Instruction Manual Part Number IM-78S 07/99 Revision B 5 Harris Court, Building L Monterey, CA 93940 (831) 373-0200 (800) 866-0200 Fax (831) 373-4402 http://www.
Table of Contents Series 780S Instruction Manual 0-2 IM-78S-B 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 for oxygen gas.
Series 780S Instruction Manual Table of Contents IM-78S-B 0-3 Table of Contents Chapter 1 Introduction Series 780S Flat-Trak Mass Flow Meters ..........................1-1 Using this Manual.................................................1-1 Note and Safety Information.
Table of Contents Series 780S Instruction Manual 0-4 IM-78S-B Chapter 4 Troubleshooting and Repair Troubleshooting the Flow Meter.....................................4-1 Returning Equipment to the Factory.................................4-3 Appendix A Product Specifications List of Figures 1-1.
Series 780S Instruction Manual Table of Contents IM-78S-B 0-5 Warnings and Cautions Warning! Agency approval for hazardous location installations varies between flow meter models. Consult the flow meter nameplate for specific flow meter approvals be- fore any hazardous location installation.
Table of Contents Series 780S Instruction Manual 0-6 IM-78S-B.
Series 780S Instruction Manual Chapter 1 Introduction IM-78S-B 1-1 Chapter 1 Introduction Series 780S Flat-Trak ™ Mass Flow Meters Sierra’s Series 780S Flat-Trak Mass Flow Meter provides a reliable solution for monitoring gas mass flow rate.
Chapter 1 Introduction Series 780S Instruction Manual 1-2 IM-78S-B Note and Safety Information We use note, caution and warning statements throughout this book to draw your attention to important information. Warning! Caution! Note This statement appears with information that is important to protect people and equipment from damage.
Series 780S Instruction Manual Chapter 1 Introduction IM-78S-B 1-3 The Series 780S Flow Sensing Principle Sierra’s unique Steel-Trak ™ sensor probe is responsible for the un- surpassed accuracy, ruggedness and reliability of Sierra industrial flow meters.
Chapter 1 Introduction Series 780S Instruction Manual 1-4 IM-78S-B Smart Electronics Features Instrument Validation Two simple tests offer full “field-validation” of your Smart mass flow meter.
Series 780S Instruction Manual Chapter 1 Introduction IM-78S-B 1-5 Totalizer With the optional LCD display, actual mass flow appears on line 1 and the totalized flow on line 2 both in the user-specified engineer- ing units.
Chapter 1 Introduction Series 780S Instruction Manual 1-6 IM-78S-B.
Series 780S Instruction Manual Chapter 2 Installation IM-78S-B 2-1 Chapter 2 Installation Installation Overview The Series 780S Flat-Trak ™ is available with ANSI or DIN flanges, NPT or butt-weld connections. For ease of installation, the meter is pre-assembled with the sensor probe installed in the flow body.
Chapter 2 Installation Series 780S Instruction Manual 2-2 IM-78S-B Unobstructed Flow Requirements Select an installation site that will minimize possible distortion in the flow profile. Valves, elbows, control valves and other piping compo- nents may cause flow disturbances.
Series 780S Instruction Manual Chapter 2 Installation IM-78S-B 2-3 To install the flow meter: 1. Turn off the flow of process gas. Verify that the line is not pres- surized. Confirm that the installation site meets the minimum up- stream pipe diameter requirements shown in Table 2-1.
Chapter 2 Installation Series 780S Instruction Manual 2-4 IM-78S-B Wiring Connections For NEMA 4X enclosures, use TB2 for power and signal connec- tions, TB1 is for sensor connections. (The terminal designations are labeled inside the enclosure cover.
Series 780S Instruction Manual Chapter 2 Installation IM-78S-B 2-5 Input Power Wiring AC Power Wiring The AC power wire size must be 26 to 16 AWG with the wire stripped 1/4 inch (6 mm). Connect 100 to 240 VAC (300 mA load, maximum) to the Neutral and Line terminals on the small, two- position terminal block.
Chapter 2 Installation Series 780S Instruction Manual 2-6 IM-78S-B DC Power Wiring The DC power wire size must be 26 to 16 AWG with the wire stripped 1/4 inch (6 mm). Connect 18 to 30 VDC (625 mA load, maximum) to the terminals marked PWR+ and PWR– on the terminal block.
Series 780S Instruction Manual Chapter 2 Installation IM-78S-B 2-7 Output Signal Wiring Output signal cable should be completely screened with a 100% shield. You must use metal cable glands that provide cable screen clamping. The cable screen should be connected to the gland and shielded at both ends over 360 degrees.
Chapter 2 Installation Series 780S Instruction Manual 2-8 IM-78S-B 4-20 mA Output Wiring The 4-20 mA current loop output can be self-powered (non-isolated) or externally powered (isolated). To use the 4-20 mA isolated output, an external 12 to 36 VDC power supply is required.
Series 780S Instruction Manual Chapter 2 Installation IM-78S-B 2-9 R load 4-20 out (+) 4-20 out (–) 12 VDC to 36 VDC Current – + 1 2 15 16 NEMA 4X Enclosures Figure 2-11. Isolated 4-20 mA Current Loop Connections NEMA 4X Enclosures 4-20 out (+) V out (–) AUX PWR OUT Jumper Current R load (Common) 1 2 15 16 Figure 2-12.
Chapter 2 Installation Series 780S Instruction Manual 2-10 IM-78S-B Alarm Output Wiring Two alarm outputs (Low Alarm and High Alarm) are included on the flow meter terminal block. The alarm outputs use optical relays that are normally-open single-pole relays with one common connection.
Series 780S Instruction Manual Chapter 2 Installation IM-78S-B 2-11 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 Hazardous-Area Enclosures Load Load LO ALARM (–) AC or DC power supply HI ALARM (–) ALRM COM Figure 2-17.
Chapter 2 Installation Series 780S Instruction Manual 2-12 IM-78S-B Velocity sensor RED GREEN ORANGE WHITE BLACK Temperature sensor Remote enclosure Sensor probe NEMA 4X Enclosures Note: Sensor wire color may vary - see label in cover Figure 2-19. Remote Electronics Enclosure to Sensor Connections Figure 2-20.
Series 780S Instruction Manual Chapter 2 Installation IM-78S-B 2-13 Figure 2-22. Sensor Junction Box to Remote Enclosure Connections Range Selection Wiring To access range selection, connect two wires on the terminal strip as shown below. When the switch is closed the device changes to Range 2.
Chapter 2 Installation Series 780S Instruction Manual 2-14 IM-78S-B.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-1 Chapter 3 Operation This chapter covers flow meter operation, programming and instru- ment validation procedures. All instructions include directions for using either the optional LCD display or the internal Smart electron- ics device for programming.
Chapter 3 Operation Series 780S Instruction Manual 3-2 IM-78S-B Using the Smart Electronics Basic Features This section covers the basic features of the Smart electronics and in- cludes instructions o.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-3 LCD Display Programming Menu Version Serial No. Sierra Flow Meter Current flow rate Totalized flow Span Volts Zero Volts High Alarm Span mA User FS K-Factor Flow Total Flow Flow Alarm Range No.
Chapter 3 Operation Series 780S Instruction Manual 3-4 IM-78S-B Single-Digit LED Programming Menu FUNCTION Assignments Version Voltage Span Voltage Zero High Alarm Current Span User Full Scale K-Factor Range in use Software version shown in series of 3 digits 1 Run Mode Press FUNCTION to view or change settings.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-5 Entering Alarm Parameters Use the High Alarm and Low Alarm function to set or adjust alarm trip points. The alarms have a minimum hysteresis of 3% to avoid "chattering." When setting a window alarm, the alarm setpoints must be at least twice the hysteresis value apart.
Chapter 3 Operation Series 780S Instruction Manual 3-6 IM-78S-B K-Factor Adjustment Entering a K-factor adjusts the meter’s output signal without affect- ing the factory calibration curve.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-7 User Full Scale Adjustment The user full scale (UFS) feature adjusts the flow meter output range anywhere within 50% to 100% of the factory full scale (FFS). This feature allows you to re-range the voltage or current output of the meter to accommodate different flow rates.
Chapter 3 Operation Series 780S Instruction Manual 3-8 IM-78S-B Time Response Delay Adjustment Changing the Time Response Delay using the LCD Display 1. Select FUNCTION, enter the password. Select FUNCTION again until Time Response appears on the display.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-9 Totalizer Reset If your device is equipped with the optional LCD display, reset the totalizer using the magnetic switches or device buttons. If you are unable to open the flow meter enclosure, use a magnet to reset the totalizer as shown below.
Chapter 3 Operation Series 780S Instruction Manual 3-10 IM-78S-B.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-11 Using the Smart Electronics Advanced Features Zero and span (Function 1 through 4) can be used to validate system operation and calibrate the digital to analog signals on the Smart electronics device.
Chapter 3 Operation Series 780S Instruction Manual 3-12 IM-78S-B Note: when adjusting zero the current signal will be driven to 4 mA and when adjusting span the current signal will be driven to 20 mA. We recom- mend recording the current values before making any changes to the current zero or span settings.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-13 Instrument Validation System electronics are verified by injecting a known input value and confirming that the flow meter outputs the expected value.
Chapter 3 Operation Series 780S Instruction Manual 3-14 IM-78S-B Electronics Validation Procedure 1. Verify the flow meter is off line from any remote communica- tions. Make sure the meter’s user full scale setting is the same as the factory full scale setting.
Series 780S Instruction Manual Chapter 3 Operation IM-78S-B 3-15 Calibration Certificate Values Validation Test Results Sample Point Bridge Voltage Indicated Flow Output (V or mA) Indicated Flow (LCD) Flow Meter Stated Accuracy Output (V or mA) Flow Meter Stated Accuracy 0% 25% 50% 75% 100% Table 3-1.
Chapter 3 Operation Series 780S Instruction Manual 3-16 IM-78S-B 4. Set the multimeter to read Ohms in the 2K range. Connect the multimeter to the terminals of J5 and J6 (temperature sensor). Measure the resistance between J5 and J6 and record the tem- perature sensor resistance (in Ohms) in Table 3-2.
Series 780S Instruction Manual Chapter 4 Troubleshooting & Repair IM-78S-B 4-1 Chapter 4 Troubleshooting and Repair Troubleshooting the Flow Meter Begin hardware troubleshooting by verifying the following facilities issues are correct. These areas impact system operation and must be corrected prior to performing any flow meter inspections.
Chapter 4 Troubleshooting & Repair Series 780S Instruction Manual 4-2 IM-78S-B Problem Possible Cause Solution Velocity measurement is erratic or fluctuating Very erratic or non-uniform flow Follo.
Series 780S Instruction Manual Chapter 4 Troubleshooting & Repair IM-78S-B 4-3 Returning Equipment to Factory Before returning any mass flow meter to the factory, you must re- quest and complete a Sierra Calibration/Repair Data Sheet.
Chapter 4 Troubleshooting & Repair Series 780S Instruction Manual 4-4 IM-78S-B.
Series 780S Instruction Manual Appendix A Specifications IM-78S-B A-1 Appendix A Product Specifications Performance Specifications Accuracy ± 2% of reading from 10 to 100% of calibrated range ± 0.5% of full scale below 10% of calibrated range Repeatability ± 0.
Appendix A Specifications Series 780S Instruction Manual A-2 IM-78S-B Leak Integrity 1 X 10 –4 atm cc/sec of helium maximum Power Requirements 18 to 30 VDC (regulated), 625 mA maximum 100 to 240 VAC.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Sierra 780S è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Sierra 780S - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Sierra 780S imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Sierra 780S ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Sierra 780S, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Sierra 780S.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Sierra 780S. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Sierra 780S insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
