Pressure measurement
intelligent, energy-saving electronics system. Whether LoRaWan or mobile communications are used depends on the requirements for the data recording or on the type of radio coverage available on site. Data can be exchanged bidirectionally in
both radio systems. Not only does this mean that measured values can be sent from the measuring point to the central collection point (cloud), but communication from the central collection point to each measuring point is also possible too. Communication to the device is used for configuration notifications, which, for example, change a measuring interval from a distance. The communication interface from KELLER devices with LoRaWAN (ADT1) as well as mobile communications devices (ARC1) is well documented and a software sample code is available for integration into the company’s own application. All devices are designed so that a software
update can be installed on the devices. This is extremely helpful in the context of the extension of radio technologies or modifications of wireless protocols. The electronics of the ARC1 mobile communications device for data transmission have a modular design and allow replacement of the radio module in the event of future technology changes so that the transmission device can be adapted again to the latest mobile communications generation with a small intervention and without having to replace the entire device.
Features of LoRaWAN transmission
The data is exchanged via gateways (antennas) that are connected to the network server over the Internet. The measurement data is forwarded from the network server to the KOLIBRI Cloud or the application accesses the data from the network server. Individual measured values are transmitted at the shortest possible intervals of approximately 10 minutes.
The transmission normally takes place without confirmation of whether it was successful.
With LoRaWAN, radio transmission takes place via public networks (often belonging to mobile communications providers), private networks (a city has its own network) or an open network such as The Things Network (TTN).
Transmission distances of up to 15 km or over, depending on the conditions on site.
Operation without a SIM card / transmission device must be registered to a network.
Sent via a licence-free radio frequency. Everyone can establish their own radio system.
There is (still) no global radio network. 38
Features of mobile communications transmission (2G 3G 4G / NB-IoT LTE-M)
Data is exchanged with the KOLIBRI Cloud via standardised processes such as FTP or e- mail; it does not matter which technology is used (2G 3G 4G / NB-IoT LTE-M).
Lots of measured values can be recorded in a short interval (one minute). Data is mostly transmitted in data packages that contain several measured values.
Data is always transmitted with acknowledgement of receipt. The transmitter will see whether the transmission was successful.
Radio transmission only uses networks of mobile communications providers.
Transmission distances of 15 km and over, depending on the conditions on site.
Operation with a SIM card.
Sent via licensed radio frequencies. Only mobile communications providers may operate these radio networks.
Worldwide communication system
Security The data is transmitted in encrypted form for LoRaWAN and mobile communications, from the measuring point to the cloud. Current cryptographic processes are used here. The encryption can be stronger for mobile communications as a result of the higher data throughput and the choice of encryption types available.
KOLIBRI CLOud
KOLIBRI Cloud by KELLER offers simple and convenient access to the measurement data with your own personal login and SSL encryption. With the KOLIBRI Cloud web app, data is available without the need to set up and maintain a database. Measurement data can be displayed in graphic form in no time at all and the export function allows you to download your data as Excel or CSV files. Measuring points are effortlessly and efficiently monitored with the integrated alarm system. For instance, a warning can be triggered via e-mail if there is an increase in the water level or a battery is running low. The cloud software interface (API) allows
measured values from another software system to be called up in a standardised JSON format via HTTPS. This way, the data can be continuously transferred into the company’s own software system, therefore making processes more efficient, which is the goal of digitalisation with IoT. KELLER provides software developers with extensive documentation on the API.
KELLER AG für Druckmesstechnik
keller-druck.com/en/
‘PluS’ PoIntS SICK’S PBS PreSSure
SenSor HaS More
control, measurement and real-time monitoring in one IO-Link enabled device. The next-generation SICK PBS Plus combines
S
application versatility and high-machine availability with an improved measurement capability between 0.4 and 1,000 bar (gauge pressure). The high 0.5 per cent accuracy, and a scalable analogue output with 5:1 turn-down ratio, supports the ability to set even small measurement ranges to suit the application. With IO-Link as standard, PNP/NPN and analogue outputs available, the SICK PBS Plus can ably turn its hand to many process switching, measurement, and pressure data feedback duties. The highly corrosion-resistant stainless-steel
membrane and IP67 heavy-duty plastic housing make the PBS Plus a robust and economical solution for common process applications, such as measuring system pressure, hydrostatic level measurement or monitoring cylinder pressure in hydraulic presses. “The beauty of the PBS Plus is its versatility to
be put to work on a wide range of duties for which previously it would have been necessary to order or store several different variants,” explains Darren Pratt, SICK UK. “With the easy configuration benefits afforded by IO-link, the PBS Plus can be simply adapted to many different measurement and switching requirements.” The SICK PBS Plus pressure sensor also
provides users with a wealth of additional data. It can send process data via IO-Link to the control as measured values in bar, as well as displaying and transmitting process temperature readings in °C. The sensor records and counts over-pressure events, as well as logging operating hours together with high and low pressures and temperatures. It therefore aids process resilience and provides valuable data for condition monitoring and predictive maintenance. Set up of the PBS Plus is straightforward
using the three push buttons and on-sensor display. There is also no need to convert the IO-Link process data, as it is transmitted
automatically as measured values.
www.sick.co.uk
January 2021 Instrumentation Monthly
ICK has upgraded its pressure sensor offering with the versatile and multifunctional PBS Plus, combining electronic pressure
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