Thermal Dispersion Flow Switches

Thermal Dispersion Flow Switch, Series TDFS2

Dwyer Instruments, Inc. offers several flow measuring products that use a thermal sensing element.

Thermal dispersion flow sensors use a temperature element that is heated up beyond the media temperature. Based on calorimetry, the flow moving past the sensor will have a cooling effect that is directly proportional to the flow velocity. The heat is convected from the heated probe surface to the boundary layer of the fluid flowing over the heated surface. Continue reading “Thermal Dispersion Flow Switches”

Enclosure Ratings for Personal Protection and Dust/ Water Ingress Protection

Weatherproof Enclosures

Many Dwyer Instruments, Inc. products have enclosures that are designed to be rated weatherproof, dust-proof, or even submersible. There are two main rating codes for enclosure protection classification: NEMA and IEC.

In the United States, the National Electrical Manufacturers Association (NEMA) has publication 250-2003, Enclosures for Electrical Equipment, that is commonly used for ratings. Underwriters Laboratories (UL) has similar ratings to the NEMA ratings. Meeting a NEMA rating on a product can be self-declared by the manufacturer based on product testing; whereas having UL approval to the rating requires testing by UL for proof that the product meets the standard. Continue reading “Enclosure Ratings for Personal Protection and Dust/ Water Ingress Protection”

Weatherproof Enclosure Ratings: Speaking the Secret Language of NEMA and IP

Understanding the necessary requirements for your product’s enclosure ratings is important, particularly when looking to gain the optimum life from your product while avoiding any safety concerns. Included below is a straight forward easy to understand overview of enclosure ratings, including NEMA types, IP ratings, and the difference between the two. We will be looking at these two common standards for industrial enclosures, what they equate to, some alternatives, and how to best choose the right one for your application. Continue reading “Weatherproof Enclosure Ratings: Speaking the Secret Language of NEMA and IP”