What do I need to know to filter air used in a ISO class clean room?

Author: David J. Connaughton
Blog: Compressed Air the Fourth Utility

A reader emailed me with an interesting situation that probably happens all the time. He has pneumatics inside a clean room but his "building" compressed air is neither dry nor clean. This poses a tricky situation as any sir that feeds this pneumatics must be clean enough to no contaminate the clean room. Also, these filters must no have automatic drains which could unexpectedly dump contaminant into the room. I recommended that he mount a dryer just outside the room. Our Parker Balston Membrane Air Dryers are a good choice as they don't use any electricity and are easy to install and maintain. The dryer assures that there will be no further condensation inside the clean room that would need to be drained fro the filters. Inside the clean room the filters must have manual drains and be of fairly high efficiency, at least 99.99% at 0.01 micron or higher.

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Wika Bimetal Thermometers Available at Forberg.com

Forberg Scientific offers a complete line of Wika Temperature Instruments including Bimetal Thermometers which are available for purchase at www.forberg.com . Styles ranging from pocket test thermometers to process grade thermometers and industrial-grade thermometers are available. These temperature instruments have cases and bezels that are made from sturdy, corrosion resistant 304 stainless steel and incorporate anti-parallax heavy gauge aluminum dials that incorporate a white matte finish to reduce glare. Stem lengths to 72 inches are available as well as 316SS stem and connector assemblies. Wika bimetal thermometers are guaranteed to be accurate to within one percent of full scale (Grade A per ASME B40.3). Calibration is to standards traceable to the National Institute of Standards and Technology. Wika extends a seven year warranty on standard bimetal thermometer types 30, 31, 50, 51, 32, & 52.

Bimetal Thermometer: Theory of Operation
The temperature is measured with a bimetal system inside the thermometer stem. The bimetal system consists of two metal strips bonded together that have different expansion coefficients. Therefore, one strip will expand faster than the other causing the bimetal strip to curl in proportion to its temperature. The bimetal system is helically wound and heat treated for long term stability. Temperature variations cause the bimetal strip to unwind or wind tighter, which in turn rotates the pointer.

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United Electric Controls UE TX200H HART Smart Pressure Transmitter

United Electric Controls News Release May 2, 2011

Watertown, MA - United Electric Controls introduces the TX200H, a HART smart pressure transmitter designed for the upstream oil and gas applications. The TX200H provides simplified field adjustment while reliably communicating asset management data utilizing the latest HART 7 specification.

A flexible 10:1 turndown on the pressure ranges from the 0 to 15 psi (0 to 1 bar) up to 0 to 25,000 psi (0 to 1724 bar) allow users to range the transmitter as application requirements change while reducing inventory levels through model reduction. The TX200H real-time diagnostics also reduce maintenance costs by reporting device health status and process performance, alerting users to potential problems to troubleshoot before escalation occurs.

The TX200H is constructed of 316 stainless steel, welded and hermetically sealed to meet enclosure type 4X and IP66 requirements. Its rugged design lends itself to being mounted directly onto the process or panel mounted within the control panel. Standard approvals include cULus for Class 1, Div.1 & 2, Zone 1 and ATEX Ex d and Ex tD hazardous areas. Is is CE compliant to both PED and EMC dirtectives.

Integrating the TX200H into most process systems is simple. Since HART communication is superimposed over the 4-20 mA signal, the TX200H can use existing wire as and upgraded. drop-in replacement for a standard analog 4-20 mA transmitter. A user may easily communicate with the TX200H utilizing a handheld device or a PC equipped with commercially available software.

To purchase the TX200H or get more information contact Forberg Scientific Customer Service Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com



TX200H Data Sheet

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