May, 2004

Contents
1. Pepperl+Fuchs launches FieldConnex
2. Vortex Cooler Sizing
3. Synonymous with Safety

1. Pepperl+Fuchs Launches FieldConnex
Bernd Schuessler, Product Manager

Pepperl+Fuchs is pleased to introduce our newest family of products- FieldConnex. Foundation Fieldbus is rapidly being adopted as the interface of choice among the Process markets. FieldConnex allows you to tap into the power of Fieldbus solutions without needing to integrate different vendors, products and protocols. We have all the product options available for a fully integrated solution. 

There are several thoughtful advantages to using FieldConnex:

• Fieldbus power solutions for safe and hazardous areas (I.S. Div.1, non-incendive Div. 2, and general purpose areas)
• Supports FISCO, FNICO and other entity installations
• Increases the number of field instruments without lowering reliability
• Costs less, reduces wiring and instrument enclosures, is robust and scalable, etc. 

FieldConnex has all the equipment you need to connect field devices to your controller. You can use FieldConnex products with Foundation Fieldbus H1 or Profibus PA networks. If you have a new fieldbus project, or are retrofitting an application, choose FieldConnex. 

Learn more by visiting: http://www.pfsolutions.info/FieldConnex/

2. Vortex Cooler Sizing
Chris Romano, Product Manager

In our April edition of Gate-Way we talked about the need for a Vortex indicator when using a Vortex cooler to cool equipment in a pressurized enclosure. Pressure inside the enclosure increases due to the addition of a second source of gas supply coming into the enclosure. The vortex indicator monitors this increase in pressure. The second source of gas also affects the sizing of the vent. Normally, Pepperl+Fuchs vents are sized for a particular panel's flow rate during purging- to keep the pressure below 5” H2O. 

The Vortex cooler introduces two parameters that must be determined before sizing the correct vent for the system:
(1) Maximum flow rate of the Vortex cooler
(2) Maximum pressure allowed for the enclosure

Once these parameters are determined, the size of the vent can be selected by adding the flow rate of the Pepperl+Fuchs purge panel and the maximum flow rate of the vortex cooler. This gives you the maximum flow rate of the system. The data sheet for the EPV vent gives the maximum flow rate for each vent. Choose a vent from the maximum flow rate calculated above for a pressure acceptable for the enclosure. 

Example: Customer is using a Vortex cooler and a 3003 panel. The Vortex cooler has a max. flow rate of 30 cu.ft./min. 
(1800 cu.ft./hr). What vent should be used?

Purge rate of the panel is given in the data sheet + Vortex flow rate:
Purge rate of the 3003 panel = 12 cu.ft./min

Max flow rate = (12+30)x60 = 2520 cu.ft./hr

Vent Compatibility & Flow Chart 
Vent Normal SCFH Maximum SCFH
@ 3”H2O @ 7”H2O
EPV-3-SA 1143 1971
EPV-4-SA 2510 4387

The EPV-4-SA… vent unit is the best choice for this application. When the rapid exchange and vortex cooler is on, the enclosure pressure is around 3” H2O. This is normal for purging/pressurization systems.

Keep in mind that when Vortex coolers are used in a purge/ pressurization system, the next size EPV vents are often required for the application. Contact Pepperl+Fuchs for more information: ask@us.pepperl-fuchs.com

3. Pepperl+Fuchs - Synonymous With Safety
David Hohenstein, Department Manager

Pepperl+Fuchs is a market leader in Intrinsic Safety. In 2003 and 2004, Pepperl+Fuchs was voted (by our customers) the #1 supplier of intrinsic safety devices, purging systems and components. We’re proud that our customers trust our expertise on intrinsic safety, and invite you to visit our www.pfsolutions.info web site. This domain supports advertisements running in industry trade publications like Control Design and Control Magazine. 

We've added a new section to the site. The new /Hazloc navigation tab features several short articles about our purge systems and complementary products. You can read about the basics of intrinsic safety and how to protect equipment when it’s installed in hazardous areas. These articles are some of our most popular downloads, so visit the site to get your copy. If you need help, choose the “Ask an Expert’ (our product experts answer your technical questions) feature, request a salesperson to contact you, or get a quote on products. More literature choices like Catalogs and brochures can be downloaded or mailed to your location. Find out why Pepperl+Fuchs is Synonymous with Safety- visit www.pfsolutions.info.

Pepperl+Fuchs, Inc.  1600 Enterprise Parkway, Twinsburg, Ohio 44087             
Phone: 330-425-3555 Fax: 330-425-4607                 
www.am.pepperl-fuchs.com