Why Choose a 38R Self-Acting Control Valve?

There are several reasons why a 38R is a great choice in your heating or cooling applications, with the most obvious being that there is no power required. The 38R temperature regulator is a fully self-contained unit, requiring no external power source. This could mean substantial savings over the operation of other types of valves.

Regulation takes place when the sensing bulb  is exposed to changes in temperature. The thermal system is charged with a predetermined amount of vapor fill, which, when heated, will cause a bellows within the unit’s actuator housing to expand. As the bellows expands, it compresses a return spring while simultaneously moving the valve stem downward to stroke the valve.
When the process temperature decreases or in the event of thermal system failure, the return spring will move the valve stem upward to the “out” position. Continue reading “Why Choose a 38R Self-Acting Control Valve?”

Protecting Newborn Puppies with Dwyer Temperature Controllers

Doberman Mother with Litter of Puppies in a Whelping Box

A whelping box is designed to protect puppies during birth, also called whelping, by keeping them safely contained, protected from the cold, and from being accidentally crushed or smothered by their mother.

Whelping boxes vary in construction, from cardboard boxes which have been found and re-purposed, to enclosures which have been designed specifically for the protection and care of the newborns. Continue reading “Protecting Newborn Puppies with Dwyer Temperature Controllers”

Ensuring HVAC System Safety for Reopening Schools & Office Buildings

The current COVID-19 pandemic spread and breadth is unprecedented. Because of this, it is important that precautions are taken when reopening schools and office buildings. The question we find ourselves asking as professionals in the HVAC trade is this:

How do you return the HVAC system back to normal operations (and continued operations) during this pandemic?  Continue reading “Ensuring HVAC System Safety for Reopening Schools & Office Buildings”

Characteristics of Thermal Anemometers & Why They’re Well-Suited for Low Flow Applications

There are two common ways to measure air velocity: by using pressure-based instrumentation or by using temperature-based instrumentation. Before we discuss the different technologies available for measuring velocity pressure, it is important to understand the basics of air velocity.

Continue reading “Characteristics of Thermal Anemometers & Why They’re Well-Suited for Low Flow Applications”

Certificates of Calibration Explained

Dwyer Instruments, Inc. offers a variety of calibration services for new or previously purchased products. In 2019, the Dwyer Instruments, Inc. – Engineering Laboratory, located in Michigan City, IN, gained accreditation to ISO/IEC 17025:2017 through the ANSI National Accreditation Board. The Dwyer lab now offers two different types of calibration certificates for our products: a certificate of NIST calibration and an ISO/IEC 17025:2017 accredited certificate of calibration. Now that accredited calibration services are available for select Dwyer products, it is important to know the differences between these two different calibration certificates. Knowing these differences will allow you to understand which calibration certificate will best suit your needs. Continue reading “Certificates of Calibration Explained”