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Sierra 860, 840, 830 instruction manual Motor-Operated Rotary Valves

Models: 840 830 860

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Series 830/840/860 Instruction Manual

Chapter 4 Maintenance

 

 

Caution! When using toxic or cor- rosive gases, purge the unit thoroughly with inert dry gas before discon- necting from the gas line.

Motor-Operated Rotary Valves

The electronic components in the Model 840 motorized valve flow controllers require no maintenance with the exception of the motor, which requires replacement when its service life has ended. This will be evidenced by “hunting,” or the inability to maintain set point without a constant motion back and forth, or outright failure. The motor normally has a long service life, typically more than five years, and all other possibilities should be explored before considering replacement.

To disassemble the motor-operated rotary valve:

1.To allow for component removal, set the valve to the fully open position before removing power.

2.Remove the unit from the system.

3.If desired, remove the valve from the flow body to make disas- sembly easier. Unplug the connector and remove the four bolts holding the valve assembly to the flow body. Inspect the sealing O-ring and replace as necessary.

4.Unscrew the six 4-40 Phillips head screws from the valve mo- tor enclosure and remove the lid. Loosen the lower set screws in the motor shaft coupling (there are two set screws in each location to prevent loosening during operation). Inspect the valve rotor shaft and coupling for scoring and replace if neces- sary.

5.Remove the three 8-32 screws holding the valve to the enclo- sure and separate the valve body from the enclosure.

6.Unscrew the four 6-32 x 7/8 inch flat head screws from the top of the valve and remove the valve base plate and spacer. Re- move the valve bonnet, rotor and Teflon washers. Inspect the valve rotor and body for wear and replace the O-ring and seal in the valve bonnet.

7.Inspect and replace the Teflon valve leaves and upper and lower Teflon washers if they are worn or damaged.

8.Re-assemble the components. When the controller is re- installed in the system, leak test the connection.

IM-83/84/86-H

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Sierra 860, 840, 830 instruction manual Motor-Operated Rotary Valves
Page 44 Page 46

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.