Series 830/840/860 Instruction Manual

Chapter 4 Maintenance

 

 

the no-leak condition). Now, adjust this screw clockwise one quar- ter turn past this point, tighten the locknut and replace the cap. Apply power and test the controller for proper operation.

(Quick fix for oscillation). If your unit is experiencing oscillations at lower flows, apply power, apply the desired setpoint, and adjust the valve spring adjustment screw ¼ turn at a time clockwise (in- creasing the spring tension – see procedure above) during flow un- til the symptoms disappear. Adjust ¼ turn further and tighten the locknut.

If your unit is experiencing other symptoms listed above, you may require this more involved adjustment method. Obtain a voltmeter and prepare to monitor the voltage found on pins 4 to 6 on a D-connector, or D to F on a card-edge connector. Or, if these pins are inaccessible, turn off the power and remove the cable.

1.Remove the screws and/or nuts on the top of the controller electronics cover. Cut the yellow calibration sticker. Remove the silver zero and/or span plugs on the right side of the enclo- sure or turn the plastic access-hole doors to the vertical posi- tion. Pull the cover up and off. Re-connect the cable, apply gas pressure, and apply power to the controller. Connect a voltmeter to the two wires on the back PCA that are routed to the solenoid and set the scale for 30 volts or higher.

2.Determine if this controller has a 15-volt control circuit or a

30-volt control circuit. (Don’t confuse this with the setpoint or output signals – this is an internal voltage that energizes the valve coil to raise the valve seat and open the internal orifice). M and H instruments are ALWAYS 30-volt circuits, while L instruments can be either one, based mainly on their flow-rates. Units scaled for below 10 slpm are typically set up for 15 volts while those 10 slpm or over are set up for 30 vdc. (Note: this voltage is typically listed on the calibration certificate in the “Comment” section). If there is any question, contact the fac- tory for clarification.

3.Apply a 100% set point and monitor this valve voltage, allow- ing at least three minutes for stabilization. The voltage “win- dow” for a 100% setpoint is 13-18 volts for the 30-volt circuit and 9-11 volts for the 15-volt circuit. If the voltage is out of this specification, loosen the lock nut, and adjust the center ad- justment screw. Clockwise (downward) will increase the valve voltage, while counterclockwise will decrease it. Adjust

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Sierra 830, 860, 840 instruction manual Maintenance
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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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