Venting protects enclosed electronics in attitude sensor

Gore Protective Vent prevents condensation in the Sunsight Instruments AntennAware Attitude Sensor. The sensor uses time of day, latitude and longitude information to determine solar positioning, to +/-2˚ of accuracy. High-sensitivity accelerometers measure down-tilt and antenna plumb to within +/-.25˚ accuracy.

08/28/2010


With and without: After five months of exposure to sun, rain, and snow, the AntennAware Attitude Sensor (AAS) from Sunsight Instruments with the Gore Protective Vent (left) showed no evidence of condensation, while the AAS without a vent (right) showed substantial condensation.Sunsight Instruments uses Gore Protective Vents to eliminate condensation in its AntennAware Attitude Sensor (AAS), a permanently mounted or fully integrated monitoring sensor to ensure the ongoing correct alignment of antennae. Sunsight Instruments of Orlando, FL, provides Antenna Alignment Solutions and monitoring systems to the telecommunications industry.

The sensor uses time of day, latitude, and longitude information to determine solar positioning, which is used to measure azimuth to +/-2˚ of accuracy. High-sensitivity accelerometers measure down-tilt and antenna plumb to within +/-.25˚ accuracy. The sensor can conduct accurate climbless audits and to provide alerts of misalignment conditions saves thousands of dollars for telecom operators and enhances the safety of their operations. In addition, operators have accurate alignment information for planning, ensuring efficient market coverage.

To prevent condensation and ensure accurate readings, Sunsight incorporates a membrane vent within each AntennAware protective enclosure.  The vent equalizes pressure within the dome by allowing air to pass in and out of the enclosure. It provides a barrier to prevent liquid, dirt, dust, salt and other contaminants from entering while it also reduces condensation.

Measurements made by the AntennAware are non-relative. They reference two constant sources of orientation— the force of gravity and the orbit of the earth around the sun. Obviously, this requires that the instrument be able to track the movement of the sun across the sky without any obstruction or distortion through the protective clear dome that covers it. 

Exposure to the elements puts the AntennAware at risk for condensation within the clear dome, which heats up in the sun and then cools rapidly when hit by rain or snow. This creates a vacuum within the enclosure that can stress the seals and draw moisture inside. Typical seals can begin to draw in moisture and contaminants at about 1.0 psig. Condensation formation within the dome has the potential to obstruct sunlight entering the clear dome, resulting in fewer azimuth measurements being provided to Sunsight’s clients. Moisture within the dome can also corrode the sensitive electronic instrumentation that is being protected.

Gore Protective Vents employ membrane technology used in telecom equipment, lighting enclosures, portable electronic devices, medical devices, and chemical packaging. Vents are made of expanded polytetrafluoroethlylene (ePTFE). Their porous microstructure allows air to flow freely, thereby quickly reducing condensation. Their extremely low surface tension causes them to rapidly shed water and other liquids, including acid rain, cleaning agents and oils, Gore says.

www.gore.com/protectivevents

www.sunsight.biz/Portfolio.aspx

Also read:

Venting about enclosure design

System Integration Channel on Control Engineering

Sensors New Products area on Control Engineering

- Edited by Mark T. Hoske, Control Engineering, CFE Media, www.controleng.com



No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
2017 Lubrication Guide; Software tools; Microgrids and energy strategies; Use robots effectively
Prescriptive maintenance; Hannover Messe 2017 recap; Reduce welding errors
Safety standards and electrical test instruments; Product of the Year winners; Easy and safe electrical design
Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Diagnostic functions for system safety; Specifying industrial enclosures; Effective decision support for a crisis
Transformers; Electrical system design; Selecting and sizing transformers; Grounded and ungrounded system design, Paralleling generator systems
Natural gas for tomorrow's fleets; Colleges and universities moving to CHP; Power and steam and frozen foods

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
The maintenance journey has been a long, slow trek for most manufacturers and has gone from preventive maintenance to predictive maintenance.
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Maintenance Manager; California Oils Corp.
Associate, Electrical Engineering; Wood Harbinger
Control Systems Engineer; Robert Bosch Corp.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me