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