Series 830/840/860 Instruction Manual

Chapter 1 Introduction

 

 

Figure 1-3. Sensor Temperature Distribution

Figures 1-2 and 1-3 show the mass flow through the sensor tube as inversely proportional to the temperature difference of the coils. The coils are legs of a bridge circuit with an output voltage in direct pro- portion to the difference in the coils’ resistance; the result is the tem- perature difference (∆T). Two other parameters, heat input (H) and coefficient of specific heat (Cp) are both constant. The resulting out- put is nearly linear over the transducer’s normal operating range.

Figure 1-4. Linear Range of the Transducer’s Output Signal

For mass flow controllers, once the gas flows through the monitor- ing section, it is then controlled by the built-in servo-control valve. For flows up to 500 slpm, Sierra’s proprietary high-efficiency Fast- Trak Electromagnetic Valve is used. The normally closed Fast- Trak valve is similar to an on/off solenoid valve, except that the current to the valve coil, and hence the magnetic field, is modu- lated so that the ferromagnetic valve armature, or valve plug, as- sumes the exact height above the valve’s orifice required to main- tain the valve’s command flow. The result is nearly infinite resolu- tion. All controllers with the Fast-Trak valves are available with a “Soft-Start” option for those processes that require it.

For higher flows of 50 to 200 scfm, controllers are equipped with Si- erra’s microprocessor-controlled, motor-operated rotary valve. While the rotary valve does not provide a completely positive shut-off, it does offer accurate control for higher flow installations.

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Sierra 860, 840, 830 instruction manual Sensor Temperature Distribution
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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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