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Dwyer Instruments is a company that primarily focuses on pressure, flow, temperature, and air quality. They manufacture test equipment that is designed around those measurement principles. So, when I think about tools that are absolutely essential for ensuring accurate and reliable measurements and performance of systems in HVAC, environmental, and process industries, I think about Dwyer.

A global leader in electronic test tools, Fluke is well known for its wide array of testing devices. These include digital multimeters, oscilloscopes, and thermal imagers—just a few of the essential test instruments that Fluke provides for professional use across the electrical, industrial, and automotive fields.

Test equipment for energy management and industrial automation is provided by Lovato Electric. Their product line includes power analyzers, multimeters, and other monitoring devices that help industries measure and manage electrical parameters.

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Dwyer Test Equipment
Fluke Test Equipment
Ilsco Test Equipment
Lovato Test Equipment

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Dwyer DL001 Temperature data logger.
Dwyer DL001 Temperature data logger.
$868.16 $1286.16
Temperature data logger.
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Dwyer DL6100 Pressure/temperature/RH data logger
Dwyer DL6100 Pressure/temperature/RH data logger
$1673.35 $2479.04
Pressure/temperature/RH data logger, range 0-100 psig (700 kPa).
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Dwyer DL6030 Pressure/temperature/RH data logger
Dwyer DL6030 Pressure/temperature/RH data logger
$1673.35 $2479.04
Pressure/temperature/RH data logger, range 0-30 psig (200 kPa).
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Dwyer DL6005 Pressure/temperature/RH data logger
Dwyer DL6005 Pressure/temperature/RH data logger
$1673.35 $2479.04
Pressure/temperature/RH data logger, range 0-5 psig (30 kPa).
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Dwyer DLI2-A14 LCD pressure data logger
Dwyer DLI2-A14 LCD pressure data logger
$1849.18 $2225.86
LCD pressure data logger, range 0-500 psia
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Dwyer DL75 Differential pressure data logger
Dwyer DL75 Differential pressure data logger
$1824.77 $2703.35
Differential pressure data logger, range ±5" w.c. (12.4 mbar).
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Dwyer DL72 Differential pressure data logger
Dwyer DL72 Differential pressure data logger
$1824.77 $2703.35
Differential pressure data logger, range ±2" w.c. (5.0 mbar).
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Dwyer DL710 Differential pressure data logger
Dwyer DL710 Differential pressure data logger
$1853.02 $2745.21
Differential pressure data logger, range ±10" w.c. (24.9 mbar).
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Dwyer DL71 Differential pressure data logger
Dwyer DL71 Differential pressure data logger
$1824.77 $2703.35
Differential pressure data logger, range ±1" w.c. (2.5 mbar).
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Dwyer DL70 Differential pressure data logger
Dwyer DL70 Differential pressure data logger
$1853.02 $2745.21
Differential pressure data logger, range ±0.5" w.c. (1.2 mbar).
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Dwyer DL-8T 8-channel temperature logger.
Dwyer DL-8T 8-channel temperature logger.
$2144.18 $3176.55
8-channel temperature logger.
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Dwyer 166T Telescoping pitot tube
Dwyer 166T Telescoping pitot tube
$307.52 $455.59
Telescoping pitot tube
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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).

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