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Sierra 860, 830 instruction manual 840 L, M and H series Valve Adjustment Procedure

Models: 840 830 860

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Chapter 4 Maintenance

Series 830/840/860 Instruction Manual

 

 

840 L, M and H series Valve Adjustment Procedure

The Sierra 840 L, M and H (low, medium or high-flow units) con- trol the flow with a proportional electromagnetic valve that is set up for certain process conditions. Variables, which affect their op- eration, include orifice size, spring selection and adjustment, input and output pressures and gas-flow orientation (horizontal or verti- cal). If operating conditions change it may be necessary to make a valve spring adjustment. An adjustment may also become neces- sary due to a valve-seat depression or spring sag, both of which can cause a change in the internal tension of the valve spring and electrical current. An incorrectly adjusted valve can be detected by

OSCILLATION (UNSTABLE OUTPUT), NOT OBTAINING

MAXIMUM FLOW, OR LEAKAGE AT A ZERO SET

POINT (LEAK-BY).

The following valve adjustment procedure may correct the above conditions.

Equipment needed:

L and M:

1/16” hex wrench 5/16” nut driver

H:

Standard screwdriver 3/8” nut driver

(Quick fix for leak-by). If your unit is experiencing leak-by, first confirm that this condition is mechanical in nature rather than elec- trical by shutting down the power. If leak-by stops (check for downstream flow), the problem is electrical in nature and the in- strument may require factory repair. If leak-by continues, the problem is mechanical and may be fixed by an adjustment. Re- move the small cover that is on top of the silver solenoid to the right of the rectangular electronic enclosure. (On some 840L-units this may require removing the plastic electronic enclosure to ex- pose the valve coil.) With the power off, apply the appropriate in- let pressure to the controller per the inlet/outlet operating pres- sures listed on your label and apply a zero setpoint. Loosen the lock nut. Adjust the center adjustment screw slowly clockwise (increasing the spring tension) 1/4 turn at a time until this leak-by subsides. (Putting your finger over the outlet fitting can confirm

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Sierra 860, 830 instruction manual 840 L, M and H series Valve Adjustment Procedure
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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.