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Series 780S Instruction Manual Table of Contents
™
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 The Netherlands
+31(0)20-6145810 Fax +31(0)20-6145815
IM-78S-B 0-1
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Table of Contents Series 780S 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 for oxygen gas. You are responsible for determining if this mass flow meter is appropriate for your oxygen application. You are responsible for cleaning the mass flow meter to the degree required for your oxygen flow application. © COPYRIGHT SIERRA INSTRUMENTS 1998 No part o
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Series 780S Instruction Manual Table of Contents 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 .................................1-2 Technical Assistance..............................................1-2 The Series 780S Flow Sensing Principle...........................1-
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Table of Contents Series 780S Instruction Manual 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 .......................1-3 2-1. Flow Meter Orientation.......................................2-2 2-2. Wiring Access NEMA 4X Enclosures .....................2-4 2-3. Wiring Access H
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Series 780S Instruction Manual Table of Contents 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 power off. Warning! To avoid potential electric shock, follow National Electric Code safety practices or your local code when wiring this unit to a power sour
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Table of Contents Series 780S Instruction Manual 0-6 IM-78S-B
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Series 780S Instruction Manual Chapter 1 Introduction 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 choice for many critical gas flow applications. The Series 780S meter solves the problems associated with monitoring flow in installations where long runs of straight
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Chapter 1 Introduction Series 780S Instruction Manual 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 This statement appears with This statement appears with information that is important to information that is important a short message to alert you protect people and equipment for protecting your equipment to an important detail. from damage. Pay very
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Series 780S Instruction Manual Chapter 1 Introduction 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 a temperature sensor that automatically corrects for changes in gas temperature. When power is applied to the flow meter, the transducer electronics heats the velocity s
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Chapter 1 Introduction Series 780S Instruction Manual 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 confirming that the flow meter outputs the expected value. The second test verifies that the instrument’s pri- mary sensing elements have not drifted or shifted from their
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Series 780S Instruction Manual Chapter 1 Introduction 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 memory. You may reset the totalizer using the membrane buttons or by using a hand-held magnet. Zero and Span Outputs Validate and adjust the settings to ensure outpu
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Chapter 1 Introduction Series 780S Instruction Manual 1-6 IM-78S-B
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Series 780S Instruction Manual Chapter 2 Installation 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 Warning! pre-assembled with the sensor probe installed in the flow body. Agency approval for hazardous location installations varies between flow meter models. When selecting an installation site, make sure that: Consult the flow meter name- plate for specific flo
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Chapter 2 Installation Series 780S Instruction Manual 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. To achieve accurate and re- peatable performance, install the flow meter using the recommended number of straight run pipe diameters upstream of the sensor. (1) Pip
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Series 780S Instruction Manual Chapter 2 Installation 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- Caution! stream pipe diameter requirements shown in Table 2-1. When using toxic or cor- rosive gases, purge the line with inert gas for a 2. Prepare the fluid connection fittings or flanges in the pipeline. minimum of four hours at (Fitting components should be blown clean with f
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Chapter 2 Installation Series 780S Instruction Manual 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.) Warning! To avoid potential electric Wiring connections shock, follow National Elec- NEMA 4X enclosure tric Code safety practices or inside cover terminal blocks your local code when wiring this unit to a power source TB2 and to peripheral devices. 1 2 3 Fai
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Series 780S Instruction Manual Chapter 2 Installation Input Power Wiring AC Power Wiring The AC power wire size must be 26 to 16 AWG with the wire Warning! stripped 1/4 inch (6 mm). Connect 100 to 240 VAC (300 mA load, All wiring procedures must maximum) to the Neutral and Line terminals on the small, two- be performed with the power position terminal block. Connect the ground wire to the safety ground Off. lug. Torque all connections to 4.43 to 5.31 in-lbs (0.5 to 0.6 Nm). For all installations
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Chapter 2 Installation Series 780S Instruction Manual 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, Warning! maximum) to the terminals marked PWR+ and PWR– on the terminal All wiring procedures block. Torque all connections to 4.43 to 5.31 in-lbs (0.5 to 0.6 Nm). must be performed with the power Off. All EEx installations must use an approved EEx fitting at both cable entries into the enclosure. If conduit s
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Series 780S Instruction Manual Chapter 2 Installation 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- minated to an earth ground. Flow meters are equipped with either a calibrated 0-5 VDC (0-10 VDC optional) or a calibrated 4-20 mA output signal. This linear output sig
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Chapter 2 Installation Series 780S Instruction Manual 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 are de- pendent upon the supply voltage and are given in Figure 2-10. R is the total resistance in the loop, including the wiring resis- load tance. To calculate
