Sierra 860, 840, 830 Valve Purge Function, Purging Non-Reactive Gases, Purging Reactive Gases

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Chapter 3 Operation

Series 830/840/860 Instruction Manual

 

 

Valve Purge Function

Caution! Do not use the man- ual purge function when RS-485 is ac- tive.

Caution! Always fully neutralize any toxic gas trapped inside the transducer before removing from the gas line.

Electromagnetic valves are driven with either 15 or 30 volts de- pending on the range and pressure. In general, units below 10 slpm have the 15 volt valve. When the purge function occurs, electro- magnetic valves are driven fully open regardless of the set point input. Furthermore, the purge function will override any valve-off function. This option is not available on motor-operated rotary valves. Motor-operated valves are purged by setting the command signal to full scale. There is no equivalent monitor function.

The Model 860 allows valve monitoring and the purge function to be utilized in either analog or digital (RS-485) mode. If both hard- ware and software control options are used simultaneously on an 860, conflicts may occur that can produce undesired results.

For +15 Volt Valve Controllers: The valve purge function is acti- vated when the Valve Test Point/Purge connection is connected to ground. The maximum valve voltage is indicated in the “comments” field of the calibration certificate. (Units with ranges below 10 slpm)

For +30 Volt Valve Controllers: The valve purge function is acti- vated when the Valve Test Point/Purge connection is connected to +15 VDC. The maximum valve voltage is indicated in the “com- ments” field of the calibration certificate.

A Sierra controller intended as a replacement for another manufac- turer’s controller may have Pin D and other pins disconnected. Some options may not be available.

Purging Non-Reactive Gases:

Purge the transducer with clean, dry nitrogen for a minimum of two hours.

Purging Reactive Gases:

One of the following methods may be used:

•Cycle purge. This is done by alternately evacuating and purg- ing the transducer for two to four hours with clean, dry nitro- gen.

•Purge the transducer with clean, dry nitrogen for eight to twenty-four hours.

•Evacuate the transducer for eight to twenty-four hours.

When toxic or corrosive gases are used, purge unit thoroughly with inert dry gas before disconnecting from the gas line. If a transducer used with a toxic or corrosive gas is returned to the factory, a Ma-

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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 Introduction Using This ManualIntroduction Safety Information Receipt of System ComponentsTechnical Assistance Flow Paths through the Transducer Series 800 Flow Sensing PrincipleSensor Temperature Distribution Installation Installation Overview Installing the Transducer Compression FittingsVCO 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 Mass Flow Controller Features Controller Auto Shut-Off FeatureOver-Range and Cold Sensor Lockout Circuit Soft Start Response Times On-Off Control and Soft Start OptionValve Purge Function Purging Non-Reactive GasesPurging 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 Conversion of Flow Rate to Other T and P Conditions Example 1 Changing Standard ConditionsExample 2 Finding the Actual Flow Rate 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.

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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