Sierra 840, 860 Flow Controllers with Motor-operated Rotary Valves, Valve rotates continuously

Models: 840 830 860

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Series 830/840/860 Instruction Manual

Chapter 5 Troubleshooting

 

 

Flow Controllers with Motor-operated Rotary Valves

Problem

Possible Cause

Solution

Valve “hunts” back and forth

Pressure differential too great

Reduce pressure

continuously

Motor coupling set screws loose

Tighten set screws

 

 

Valve motor failure

Replace motor

Valve rotates continuously

Limit switch out of adjustment or bro-

Adjust or replace switch

 

ken

 

 

Microprocessor failed

Replace microprocessor

Valve does not rotate

Contaminant blocking valve

Remove blockage

 

Motor fuse blown

Replace 1 amp fast blow fuse on

 

 

motor valve board

Flow reading is erratic

Inlet filter screen clogged

Clean or replace screen

Reads full scale with no flow or

Defective sensor

Return to factory for replacement

with valve shut

Q1 shorted

Replace with same type part

 

 

U10 failed

Replace with same type part

Flow does not match set point

Insufficient pressure differential

Increase pressure or reduce set

within specifications

 

point

IM-83/84/86-H

5-3

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Sierra 840, 860, 830 instruction manual Flow Controllers with Motor-operated Rotary Valves, Valve rotates continuously

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.