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Sierra 780S - page 1
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.sierrainstruments.com Sierra Instruments b.v. Bolstoen 30A 1046 AV Amsterdam T ...
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Sierra 780S - page 2
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. You are responsible for determining if this mass flow meter is appropriate for your oxygen applicat ...
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Sierra 780S - page 3
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.....................................1-2 Receipt of System Components ........... ...
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Sierra 780S - page 4
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 Flow Sensing Principle ................... ...
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Sierra 780S - page 5
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. Warning! All wiring procedures must be performed with the ...
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Sierra 780S - page 6
Table of Contents Series 780S Instruction Manual 0-6 IM-78S-B ...
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Sierra 780S - page 7
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. Low-flow sensitivity, fast response and outstanding rangeability have made this model the instrument of ...
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Sierra 780S - page 8
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. Pay very close ...
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Sierra 780S - page 9
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. The immersible Steel-Trak sensor consists of two sensing elements–a velocity sensor and ...
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Sierra 780S - page 10
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. The first test checks the system electronics, linearization and microprocessor functionality and is performed by injecting a known input value and confi ...
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Sierra 780S - page 11
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. The totalizer counts only the selected range and when ranges are switched, the value of the non-selected range is stored in me ...
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Sierra 780S - page 12
Chapter 1 Introduction Series 780S Instruction Manual 1-6 IM-78S-B ...
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Sierra 780S - page 13
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. When selecting an installation site, ...
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Sierra 780S - page 14
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. Check your specific piping condi- tion against the examples shown below. T ...
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Sierra 780S - page 15
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. 2. Prepare the fluid connection fittings or flanges in the pipeli ...
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Sierra 780S - page 16
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.) Wiring connections inside cover To access components: 1. Loosen 4 screws. 2. Remove cover. NEMA 4 ...
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Sierra 780S - page 17
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. Connect the ground wire to the safety gr ...
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Sierra 780S - page 18
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. Torque all connections to 4.43 to 5.31 in-lbs (0.5 to 0.6 Nm). All EEx insta ...
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Sierra 780S - page 19
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. The shield should be ter- mina ...
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Sierra 780S - page 20
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. The maximum loop resistance (load) for both types of current loop outputs ...
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Sierra 780S - page 21
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. Non-Isolated 4-20 mA Cu ...
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Sierra 780S - page 22
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. There are two connection options for alarm outputs–the first ...
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Sierra 780S - page 23
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. Isolated Alarm Output Connections 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 ...
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Sierra 780S - page 24
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. Sensor Junction Box to Remote Enclosur ...
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Sierra 780S - page 25
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. Opening the switch returns the device to Range 1. Figu ...
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Sierra 780S - page 26
Chapter 2 Installation Series 780S Instruction Manual 2-14 IM-78S-B ...
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Sierra 780S - page 27
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. If your meter is not equipped with ...
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Sierra 780S - page 28
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 on: • entering alarm parameters • changing the user full scale • adjusting the K-factor • adjusting the time response speed • resetting the t ...
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Sierra 780S - page 29
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. UFS Current range in use User full scale Current flow rate If an alarm is active, will flash ...
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Sierra 780S - page 30
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. Use the UP or DOWN button to enter n ...
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Sierra 780S - page 31
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. We sug ...
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Sierra 780S - page 32
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. Use the K-factor calibration offset for additional flow profile compensation (the factory includes an ini- tial flow profile correction in the calibration curv ...
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Sierra 780S - page 33
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. Note: when e ...
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Sierra 780S - page 34
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. 2. Use UP or DOWN to adjust the time response delay from 0.10 to 7.2 seconds. 3. Select FUNCTI ...
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Sierra 780S - page 35
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. Reset the Totalizer using the LCD Display ...
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Sierra 780S - page 36
Chapter 3 Operation Series 780S Instruction Manual 3-10 IM-78S-B ...
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Sierra 780S - page 37
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. Additionally, these functions can compensate for resistance in long signal cables co ...
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Sierra 780S - page 38
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. Current Zero Adjustment If needed, use Ze ...
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Sierra 780S - page 39
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. This test confirms that the microprocessor, analog to digital and digital to analog converters, the linearizer and the display are work ...
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Sierra 780S - page 40
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. If not, adjust the user full scale value as needed. 2. Locate the Calibration Certific ...
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Sierra 780S - page 41
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. Electronics Validation Results Sensor Validatio ...
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Sierra 780S - page 42
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. 5. Set the multimeter to read in the 200 Ohm r ...
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Sierra 780S - page 43
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. 1. V ...
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Sierra 780S - page 44
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 Follow installation requirements shown in Chapter 2 Moisture present in gas flow Install a water trap or filter upstream of the flow meter sensor Flow cond ...
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Sierra 780S - page 45
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. To obtain the data sheet contact Customer Service at: (800) 866-0200 or (831) 373-0200 in the US or +31(0)20-61 ...
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Sierra 780S - page 46
Chapter 4 Troubleshooting & Repair Series 780S Instruction Manual 4-4 IM-78S-B ...
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Sierra 780S - page 47
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 ± 0.2% of full scale Temperature Coefficient ± 0.02% of reading per °F within ± 50°F o ...
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Sierra 780S - page 48
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 , 50/60 Hz, 15 watts maximum* * not available on NEMA 4X enclosures Output Signal Linear 0-5 VDC or 0-10 VDC proportional to mass flow rate, 1000 Ohm ...
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