What is a temperature data logger?
Temperature data loggers are processor-controlled, technical devices that are used to measure and monitor temperatures and often also humidity. The measured data is stored and, depending on the data logger version, can also be transferred directly to other devices such as PLCs via communication interfaces. Temperature data loggers are used in the monitoring of cold chains, the storage of food, the production and transportation of pharmaceuticals as well as in test fields and research. Multifunctional data loggers are often used instead of temperature data loggers. These can measure and process various other physical values in addition to temperature thanks to freely configurable analog and digital inputs.
Quickly set up a measurement setup with analog inputs
Universal analog inputs are an advantage for many measurement tasks. Changing measurement tasks, multi-purpose measurements, different sensor types or fault analyses can be carried out with one device. However, a few features should be taken into account when making a selection.
Universal analog inputs are an advantage for changing measurement tasks. A wide variety of measuring applications, multi-purpose measurements or changing input signals can be implemented with one measuring device.
Typical applications for universal analog inputs
For many applications, it is an advantage if the measurement setup can be set up or reconfigured quickly. This includes measurements in the laboratory, tasks in research and development or fault analyses in industry. In the case of tests during development, the tasks can change at short notice and the measuring channels have to be reconfigured. Universal analog inputs are also advantageous for fixed installations, such as process monitoring, if different measured variables such as temperature, pressure and a voltage signal are to be recorded simultaneously. The different signals from thermocouples, resistance thermometers as well as voltage and current signals can be connected directly to the measuring device; external transmitters are not required.
What is important for universal analog inputs
Galvanic isolation of the inputs: Unwanted interference between the measurement inputs can occur during measurements. To prevent this, the inputs are electrically isolated. This prevents mutual interference.
Avoid ground loops: With measuring devices and sensors, low-frequency interference signals and equalizing currents caused by earth loops can distort the measurement signals. For this reason, each analog input should have two separate input terminals (differential inputs) without a common ground.
Sufficient measuring accuracy: The resolution and measurement accuracy of analog inputs is crucial for the quality of the results. For example, if the resolution is too low, small changes in measured values can lead to undesirable "step effects" in the measured value display and emerging trends can be overlooked as a result.
Internal linearization: The linearization functions for all common sensor types should be stored in the measuring device. For example, with a Pt100, the measured temperature values are displayed directly without the user having to worry about deriving them from the measured resistance values.
Measuring device and software support for universal analog inputs
The Loggito Logger has either four or eight universal, differential analog inputs that can be configured for the connection of voltage, current or thermocouple signals. With the RTD versions, it is also possible to connect all common resistance thermometers such as Pt100 or Pt1000 in 2-, 3- and 4-wire technology. The analog inputs offer a resolution of 24 bits and have a measuring accuracy of 0.01% of the measuring range end value for voltage, current and resistance measurements.
The software ProfiSignal 20 supports the control of measured values even with multiple signal curves. Units such as pressure, temperature and voltage can be displayed simultaneously in a diagram using several Y-axes. The DataService configuration program is used to set up the measurement and control channels from the PC.
The right software for your measurement and testing solution
Data acquisition and analysis
With ProfiSignal Go you can display online data from the Message and Expert hardware in diagram form. Numerous analysis functions, such as zoom, cursor, movable axes, flags, ASCII export and calculation channels, enable fast display of measured values and post-processing.
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Operating and monitoring
ProfiSignal Basic combines the functions of ProfiSignal Go with operating and monitoring elements of process visualisations, e.g. digital and analogue displays, switches, buttons and signal lamps. With Basic, you can create everything from simple visualisation diagrams to complex visualisation systems.
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Automate and control
ProfiSignal Klicks supplements ProfiSignal Basic with functions for process automation. Structural diagrams for mapping the process as well as a script language (completely operable with the mouse) enable even the non-informatician to create complex test stand and automation applications with automatic report generation.
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Visualisation and operation
With ProfiSignal 20 Basic you can create individual diagrams using a wide range of operating and monitoring elements. Both continuous processes (e.g. production data acquisition) and discontinuous measurement tasks (e.g. test measurements) can be visualised, operated and monitored without any programming effort. You can create the operating and monitoring diagrams by assembling and configuring the prefabricated elements.
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Fast project planning and analysis of measurement data
With ProfiSignal 20 Go you can visualise your measurement data in just a few steps, both online and offline, in various diagram types, monitor, analyse, archive as a measurement file or export directly in the appropriate file format.
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Central measurement data management
The Delphin Data Center is the solution used for the worldwide measurement networking and control of plants, machines and test stands.
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