Sierra 830, 860, 840 On-Off Control and Soft Start Option, Soft Start Response Times

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Series 830/840/860 Instruction Manual

Chapter 3 Operation

 

 

On-Off Control and Soft Start Option

On-off control is provided for all models equipped with an elec- tromagnetic valve. This feature is available by connecting a man- ual

on-off switch to the transducer connector as shown in Chapter 2.

Certain processes cannot tolerate the normally fast response of Si- erra mass flow controllers. In these cases a “soft start” circuit slows the mass flow controller’s valve response characteristics to avoid any bursts of flow that could disrupt a delicate process or perhaps stir up particulate.

The standard soft start time constant is 1.5 seconds, providing a 7.5 second response time to within 2 percent of final value. The time constant is factory-set to fit your exact requirements.

Caution! Do not use the manual valve-off feature when RS-485 is active.

Figure 3-1. Soft Start Response Times

The Model 860 provides valve on-off and soft start control with ei- ther the manual hardware option, or with digital (software) control via RS-485. For more information, refer to the Series 860 “Auto- Net” Software Addendum.

IM-83/84/86-H

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Contents Table of Contents Customer Notice Table of Contents Table of Contents Troubleshooting List of Tables Table of Contents Using This Manual IntroductionIntroduction Technical Assistance Safety InformationReceipt of System Components Series 800 Flow Sensing Principle Flow Paths through the TransducerSensor Temperature Distribution Installation Installation Overview VCO Fittings Installing the TransducerCompression Fittings VCR Fittings NPT Fittings and 1/2-Inch Connections All TypesWiring the Transducer Recommended Wire GaugesRecommended Wire Gauges Wiring Transducers with 20-Pin Card-Edge Connectors Input Output Signal ConnectionsInput Signal Connections Controllers Only Valve Purge and Valve Off Connections Controllers Only Depending on the valve voltage, connect as shown belowPin Connector Pin Designations Wiring Transducers with 15-Pin D-Connectors Input Power ConnectionsInput Signal Connections Controllers Only 13. Valve Purge and Valve Off 15-Pin D-Connector 15 -Pin D-Connector Pin Assignments Motor-Operated Valve Circular 10-Pin Connector 16. Motor-Operated Rotary Valve Connector 10-Pin ConnectorOperation Mass Flow Meter OperationMass Flow Controller Operation Electromagnetic Valve ControllersMotor-Operated Rotary Valve Controllers Over-Range and Cold Sensor Lockout Circuit Mass Flow Controller FeaturesController Auto Shut-Off Feature On-Off Control and Soft Start Option Soft Start Response TimesPurging Reactive Gases Valve Purge FunctionPurging Non-Reactive Gases Operation Flow Path Maintenance Cleaning the Laminar Flow ElementLow Flow Transducer LFE Cleaning Low Flow TransducersMedium Flow Transducer LFE Cleaning Medium Flow TransducersHigh Flow Transducer LFE Cleaning High Flow TransducersNPT Transducer LFE Cleaning NPT-Type TransducersSensor Maintenance Sensor Cleaning and InspectionSensor Electrical Test Valve Maintenance Electromagnetic Valves Low and Medium Flow ControllersElectromagnetic 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 Flow Controllers with Motor-operated Rotary Valves Valve rotates continuouslyInstructions for Returning Your Instrument for Service Factory Calibration-All ModelsReturn 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 Calculating Dual Gas Mixtures Important Note about K-FACTORSGas Tables and K-factors NEOC2H6O CH 3SH Appendix B Product Specifications Operating SpecificationsVDC Performance Specifications Physical SpecificationsValve plug standard Neoprene, 4079 Kal-Rez Transducer Mounting Dimensions Low Flow BodyMedium Flow Body High Flow Body Appendix B Specifications IM-83/84/86-H NPT Flow Body Flow Range, slpm100 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.

Display quality is another critical aspect of these laptops. The Sierra series features high-resolution screens that offer bright, vivid colors and sharp details, making them ideal for tasks requiring precision, such as drafting and design work. The touch-enabled displays enhance user interaction, providing convenience in outdoor settings where traditional input methods may be challenging.

The Sierra laptops also include a comprehensive array of connectivity options, ensuring seamless integration with various devices. With multiple USB ports, HDMI output, and optional mobile broadband, users can easily connect to peripherals, transfer data, and maintain communication. The inclusion of enterprise-level security features, including biometric scanners and encrypted storage, ensures sensitive data remains protected.

Battery life is another crucial factor in fieldwork, and the Sierra series excels in this area. With long-lasting batteries, these laptops can operate for extended periods without needing a recharge, making them perfect for long outdoor excursions or remote job sites.

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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