Test Equipment
Dwyer manometers are widely used for measuring pressure, vacuum, and differential pressure. These instruments come in various types, including digital, U-tube, and inclined-vertical manometers. Digital manometers from Dwyer are particularly popular for their ease of use, high accuracy, and the ability to provide quick readings. They are commonly used in HVAC applications, for checking gas pressure in heating systems, and for laboratory testing. U-tube and inclined-vertical manometers, on the other hand, are valued for their simplicity and are often used in educational settings and for basic pressure measurement tasks.
Dwyer’s data loggers are another essential tool in many industrial and environmental monitoring scenarios. These devices are used to record data over time, typically related to environmental parameters like temperature, humidity, pressure, and flow. Dwyer data loggers are known for their accuracy and the ability to store large amounts of data.
Products
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).