Dwyer Pressure Switches
Dwyer pressure switches are designed for dependable operation in a variety of HVAC, process, and industrial applications. These simple yet robust devices sense pressure changes and trigger electrical signals when the change exceeds a preset threshold.
Using pressure switches for airflow proving in duct systems and for monitoring the static pressure of the duct system (including the pressure drop across filters) is a common application. Also, we frequently use them to control the activation of fans and blowers in various parts of an HVAC system. These pressure switches have been used successfully in reverse airflow applications (using them to assure that airflow is in the correct direction). On occasion, we have found this pressure switch to be useful for monitoring the pressure of water and other light liquids.
The pressure switches can be mounted in a variety of locations and have been used effectively in a variety of orientations. In many applications, we have found it beneficial to use the pressure switch as part of a safety circuit--monitoring the pressure on the upstream side of a pump or a blower to assure that the system will shut down before the fan or pump can fail.
Dwyer pressure switches have a strong reputation for being valuable instruments that provide a cost-effective solution for not only keeping an eye on pressure but also for using that information to make judgments about what a system should do in response to a pressure change.
FAQs
What are Dwyer pressure switches used for in industrial applications?
Dwyer pressure switches are used to monitor, control, and protect systems by activating equipment when pressure levels reach preset thresholds.
How accurate and reliable are Dwyer pressure switches compared to other brands?
Dwyer pressure switches are known for consistent accuracy, long-term reliability, and rugged construction suited for demanding industrial environments.
Can Dwyer pressure switches be used for both air and liquid systems?
Yes, many Dwyer pressure switches are designed to work with air, gases, and compatible liquids depending on the model and diaphragm materials.
How do I select the right Dwyer pressure switch for my application?
Choose a switch based on pressure range, media compatibility, electrical rating, temperature limits, and whether you need fixed or adjustable setpoints.
Are Dwyer pressure switches easy to install and maintain?
Most Dwyer models feature simple wiring, clear setpoint adjustment, and durable housings that allow fast installation and minimal ongoing maintenance.
Analog and Digital Control Signals: The Basics
Digital Signals
Digital signals are represented in either a true or false. There is no gray area with digital signals. An example of this might be a light switch. A light switch is either on or off. Another example of this might be a motor that is running or not running. Digital signals can be generated with both AC and DC circuits with varying voltages, currents and resistance. Some practical examples of using digital signals in an industrial environment might be if a pump is running or not running or a whether a valve is open or closed.
Analog Signals
Analog signals convey information in the form of a range. A light switch might be on or off as a digital signal, but a dimmer switch would be an analog signal. It can be on or off, but it can also be somewhere in between. A practical example of using analog signals in an industrial environment would be if there is a need to measure the level of a tank; whether it's full, empty or somewhere in between. Analog signals can take many different forms with some of the more common being a 4 to 20 milliamp signal or a 0 to 5 or 0 to 10 volt signal.
Communication
Communication in a device can either be sent or received. Whether that data is sent or received depends on the type of information. Is there a need to monitor the status of something? If so, an input needs to be received about that information. Is there a need to control something? If so, an output needs to be sent about what needs to occur. Receiving inputs and setting outputs are both things that can be accomplished by using both digital and analog signal types. Therefore, the signals are referred to as analog outputs (AO), analog inputs (AI), digital inputs (DI) or digital outputs (DO).