How Thermal Flowmeters Work

Thermal flowmeters use the thermal properties of the fluid to measure the flow of a fluid flowing in a pipe or duct. In a typical thermal flowmeter, a measured amount of heat is applied to the heater of the sensor. Some of this heat is lost to the flowing fluid. As flow increases, more heat is lost. The amount of heat lost is sensed using temperature measurement(s) in the sensor. The transmitter uses the heat input and temperature measurements to determine fluid flow. Most thermal flowmeters are used to measure gas flows. Thermal flowmeters represent 2% of global flowmeter sales. Continue reading “How Thermal Flowmeters Work”

Visit Us at the Process Heating & Cooling Show!

It’s here! The Process Heating & Cooling Show kicks off today at the Donald E. Stephens Convention Center in Rosemont, IL. Be sure to stop by booth 313 to meet the Dwyer Instruments and Omega Engineering teams, and learn how we can help with your next process automation project. 

We will have a flow bench at the booth where you can see our products in action including the latest temperature, pressure, flow, and industrial internet of things (IIoT) technologies. Continue reading “Visit Us at the Process Heating & Cooling Show!”

What is Deadband? Switch Actuation and Deactuation

Electrical Switch Products

Dwyer Instruments offers many electrical switch products that make or break a contact based on sensing a parameter such as pressure, temperature, level, and so on.

Most switches are single pole double throw, often referred to as SPDT. This type of switch has one normally open contact and one normally closed contact.  Switches can also be double pole double throw, or DPDT, that have two normally open and two normally closed contacts.  Single pole single throw switches with just one contact are also available and are specified to be either normally open or normally closed.

Continue reading “What is Deadband? Switch Actuation and Deactuation”

Proving Water Flow in Rooftop Air Handlers

We met with an original equipment manufacturer (OEM) last year, who was working on a new design for rooftop air handling equipment. Part of the their design utilized water flow for cooling in a loop.

Low or no-flow conditions can cause major damage to expensive pumps, motors, and other equipment, which could result in extensive downtime and repair costs. In order to prevent this, the customer needed an inexpensive, but reliable and robust method for proving water flow. Continue reading “Proving Water Flow in Rooftop Air Handlers”