Sierra 830, 860, 840 instruction manual Example

Page 59

Series 830/840/860 Instruction Manual

Appendix A

 

 

For our purposes, we want the ratio of the flow rate, Q1, for an ac- tual gas to the flow rate of a reference gas, Q2, which will produce the same output voltage in a particular mass flow meter or control- ler. We get this by combining equations (1) and (5):

Q1/Q2 = K1/K2 = (N1/ ρ1Cp1)/(N2/ρ2CP2)

(6)

Please note that the constant b cancels out. Equation (6) is the funda- mental relationship used in the accompanying tables. For conven- ience, the tables give “relative” K-factors, which are the ratios K1/K2, instead of the K-factors themselves. In the tables, the relative K-factor is

Kactual/KN2 where the reference gas is the commonly used gas, nitrogen (N2). The remaining columns give Cp and ρ, enabling you to calculate K1/K2 directly using Equation (6). In some instances, K1/K2 from the tables may be different from that which you calculate directly. The value from the tables is preferred because in many cases it was ob- tained by experiment. Sierra calibrates every transducer with primary standards using the actual gas or a molecular equivalent reference gas. The calibration certificate accompanying the transducer cites the refer- ence gas used.

Example 1:

A transducer is calibrated for nitrogen (N2), and the flow rate is 1000 sccm for a 5.000 VDC output signal. The flow rate for car- bon dioxide at a 5.000 VDC output is:

QCO2/QN2 = KCO2/K N2, or

QCO2 = (0.74/1.000)1000 = 740 sccm

Example 2:

A transducer is calibrated for hydrogen (H2), and the flow rate is 100 sccm for a 5.000 VDC output signal. The flow rate for nitrous oxide (N2O) is found as follows:

QN2O/QH2 = K N2O/K H2, or

Q N2O = (0.71/1.01) 100 = 70.3 sccm

Note that the K-factors relative to nitrogen must be used in each case.

Example 3:

We want a transducer to be calibrated for use with dichlorosilane (SiH2Cl2) at a 100 sccm full scale flow. We wish to use the pre- ferred reference gas Freon-14 (CF4). What flow of CF4 must we generate to do the calibration?

 

QSiH2CL2 /QCF4 = K SiH2CL2 /K CF4

 

100/Q CF4 = 0.869

 

Q CF4 = 100/0.869 = 115 sccm

IM-83/84/86-H

A-5

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Contents Table of Contents Customer Notice Table of Contents Table of Contents Troubleshooting List of Tables Table of Contents Introduction Using This ManualIntroduction Technical Assistance Safety InformationReceipt of System Components Flow Paths through the Transducer Series 800 Flow Sensing PrincipleSensor Temperature Distribution Installation Installation Overview VCO Fittings Installing the TransducerCompression Fittings NPT Fittings and 1/2-Inch Connections All Types VCR FittingsRecommended Wire Gauges Wiring the TransducerRecommended Wire Gauges Output Signal Connections Wiring Transducers with 20-Pin Card-Edge Connectors InputInput Signal Connections Controllers Only Depending on the valve voltage, connect as shown below Valve Purge and Valve Off Connections Controllers OnlyPin Connector Pin Designations Input Power Connections Wiring Transducers with 15-Pin D-ConnectorsInput Signal Connections Controllers Only 13. Valve Purge and Valve Off 15-Pin D-Connector 15 -Pin D-Connector Pin Assignments 16. Motor-Operated Rotary Valve Connector 10-Pin Connector Motor-Operated Valve Circular 10-Pin ConnectorMass Flow Meter Operation OperationElectromagnetic Valve Controllers Mass Flow Controller OperationMotor-Operated Rotary Valve Controllers Over-Range and Cold Sensor Lockout Circuit Mass Flow Controller FeaturesController Auto Shut-Off Feature Soft Start Response Times On-Off Control and Soft Start OptionPurging Reactive Gases Valve Purge FunctionPurging Non-Reactive Gases Operation Cleaning the Laminar Flow Element Flow Path MaintenanceLow Flow Transducers Low Flow Transducer LFE CleaningMedium Flow Transducers Medium Flow Transducer LFE CleaningHigh Flow Transducers High Flow Transducer LFE CleaningNPT-Type Transducers NPT Transducer LFE CleaningSensor Cleaning and Inspection Sensor MaintenanceSensor Electrical Test Electromagnetic Valves Low and Medium Flow Controllers Valve MaintenanceElectromagnetic Valves High Flow Controllers Maintenance Motor-Operated Rotary Valves 840 L, M and H series Valve Adjustment Procedure Maintenance Maintenance Transducer Calibration Troubleshooting Flow Meters and Flow Controllers with Electromagnetic Valves Valve rotates continuously Flow Controllers with Motor-operated Rotary ValvesFactory Calibration-All Models Instructions for Returning Your Instrument for ServiceReturn Address Example 2 Finding the Actual Flow Rate Conversion of Flow Rate to Other T and P ConditionsExample 1 Changing Standard Conditions 14.7 460 + 10.00 = 3.47 lm 14.7 + Calculating For a Single Gas 880 Example Important Note about K-FACTORS Calculating Dual Gas MixturesNEO Gas Tables and K-factorsC2H6O CH 3SH Operating Specifications Appendix B Product SpecificationsVDC Physical Specifications Performance SpecificationsValve plug standard Neoprene, 4079 Kal-Rez Low Flow Body Transducer Mounting DimensionsMedium Flow Body High Flow Body Appendix B Specifications IM-83/84/86-H Flow Range, slpm NPT Flow Body100 200 Inlet Fnpt Appendix B Specifications

840, 830, 860 specifications

The Sierra 860, 830, and 840 are a series of rugged outdoor laptops designed for professionals who require reliable and powerful computing solutions in challenging environments. These laptops combine advanced technologies and robust construction to meet the demands of various fields, including engineering, military, field services, and outdoor research.

One of the standout features of the Sierra series is its rugged design. Constructed with military-grade materials, these laptops are highly resistant to shock, vibration, and extreme temperatures. They have undergone rigorous testing according to MIL-STD-810G standards, which ensures they can withstand harsh conditions whether in the field or during transport. Additionally, the IP65 rating guarantees protection against dust and water exposure, making them invaluable for professionals working in inclement weather or dusty environments.

The Sierra 860, 830, and 840 are powered by high-performance processors, delivering fast and efficient processing capabilities. Equipped with the latest Intel Core processors, including i5 and i7 options, these laptops can handle demanding applications and multitasking with ease. The robust memory options, ranging from 8GB to 32GB, ensure smooth performance for memory-intensive tasks.

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In summary, the Sierra 860, 830, and 840 combine ruggedness, high performance, and extensive connectivity options, making them exceptional computing solutions for professionals in various challenging environments. Their advanced technologies and robust constructions ensure they can tackle the demands of outdoor work while maintaining reliability and efficiency.
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