Sierra 830, 860, 840 instruction manual Sensor Electrical Test

Page 41

Series 830/840/860 Instruction Manual

Chapter 4 Maintenance

 

 

Sensor Electrical Test

Caution!

*Important note: Removal of the sensor cover and dis- turbance of sensor insulation blanket that is inside will alter the sensors performance,

will necessitate a re- calibation, and may break the sensor micro-weldings.

To check the electrical integrity of the sensor windings:

1.Remove the unit from the system.

2.Remove the two 4-40 Phillips head screws located on top of the electronics enclosure and slide the enclosure up and off. Use a nut driver to remove the two standoffs supporting the printed circuit boards. Tilt the boards to access the three sensor wires as shown below.

3.Locate the black, red and white wires connecting the sensor to the main circuit board.

4.Connect one lead of an Ohm meter to the white wire and meas- ure the resistance between the red and white wires. Next, measure the resistance between the black and white wires. These readings should each be approximately 50 Ohms. Low or zero Ohm readings on either indicates a short circuit. High or infinite Ohms readings indicate an open circuit.

5.Next, measure the resistance between the case (metal part of the flow body) and any one of the sensor wires. This reading should be 2 Megohms or greater. Incorrect readings require sensor replacement and re-calibration.

6.When the transducer is re-installed in the system, leak test the connection. Check transducer calibration. See instructions be- ginning on page 4-13.

Figure 4-5. Sensor Wire Access

IM-83/84/86-H

4-7

Page 40 Page 42
Image 41
Page 40 Page 42
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.

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.
Top Page Image Contents