Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!


Devices - sensors - communicating physical properties to observers.

An instrument  - or sensor - can be defined as a device that communicates a physical property to an observer. The observer can be a data acquisition system, a process control system and/or in the end a human observer.

Instruments - measured value - transducer - signal conditioning - transmitter - control system - observer

Physical Property - Measured Medium

Typical properties to measure are temperature, speed, flow .. and many more.

Some properties - like temperature - are relatively easy to measure. Others - like blood sugar - requires more advanced sensor technology.   


The transducer senses the physical variable to be measured - and converts the physical value to a suitable signal. 

Example: a RTD - Resistance Temperature Detector - that indicates temperature with electrical resistance.

Example: a tachometer that indicates revolutions with electrical pulses from a magnetic sensor.

Signal Conditioning

The signal created by the transducer may need an adaption before transmission - like

  • integration
  • amplifying or attenuation
  • converting to digital or analog signal 


The transmitter responsibility is to connect and communicate the instrument value to the control or data acquisition system. The transmitter communication is based on standardized protocols and signal levels. Typical analog values are 4-20 mA for electrical communication or 3-15 psi for pneumatic systems. 

Data Acquisition or Control System

 A data acquisition typically accumulates value for historical use or to build or run empirical models.

Example - measured air pressure used to predict next days weather.

A control system use the values for process control.

Example - temperature measured in the outlet of an heat-exchanger used to control the heat-exchanger steam supply valve. 


The observer can be a human or an artificial intelligence system.

Related Topics

Related Documents


Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .


This page can be cited as

  • The Engineering ToolBox (2017). Instruments. [online] Available at: [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter