Lesman Tech Tips
Posts Tagged wireless
Industrial Wireless 101: Why do we need three frequency bands?
Posted by danstips in Bluetooth, Cellular, Communications, Cost Issues, Ethernet, Installation, ISA 100, ISA100, Process terminology, Wireless, Wireless, Wireless Transmitters, wireless transmitters, WirelessHART, WirelessHART on March 15, 2012
Regardless of what information you need to send, or where you need to send it, if your data is going “over the air”, you’ll need to choose a frequency in one of three ranges that do not compete with the FCC licensed bands for radio transmissions.
These three ISM (industrial, scientific, medical) bands are 900 MHz, 2.4 GHz, and 5 GHz. They’ve often been described as the industrial equivalent to Citizens’ Band radios, specified so they don’t interfere with broadcast radio signals.
History with technology would lead you to believe that the more Hertz you have, the better your radios will perform. But what you need to understand is that there’s a tradeoff. Each band has its strengths and weaknesses, and there’s a best use for each.
banner engineering, banner wireless, honeywell wireless, industrial wireless, industrial wireless standards, ISA100 wireless, ism band, radio antenna, radio frequency, radio signals, radio transmissions, rf band, siemens wireless, technology, wifi, wireless, wireless band, wireless ethernet, wireless HART, wireless process data, wireless radio, wireless transmission
Using a wireless radio battery to power a pressure transmitter
Posted by danweise in Cost Issues, Measurement, Pressure Transmitters, Transmitters, WIKA, Wireless, Wireless on March 7, 2012
In an ideal world, every place you need to install a transmitter would have easy access to electrical power. But we don’t live in the ideal world, and there are locations where power isn’t readily available, and getting electrical power to those areas can be quite costly.
This was the situation at a local plant, in their flammable fuel storage facility. The site is required to keep a record of the line pressure that supplies water in the event of a fire.
The water pipe is located 6 to 7 feet (2 meters) below grade, and the engineers planned to build a vault where they could install and maintain the necessary submersible pressure transmitter.
The planned location is more than 500 yards from any available power source. The signal coming from the pressure transmitter would have to run that distance plus an additional 200 yards to reach the control room.
Not surprising, the trenching cost for an electrical installation was quoted at a five-figure minimum price.
Finding a solution
The project engineer started considering a wireless solution, and then asked, “Can a battery-powered industrial radio also power a two-wire loop-powered pressure transmitter?”
Banner, banner engineering, battery, battery power, loop power, monitoring water pressure, pressure transmitter, remote-mount transmitter, sensor, switched power, transducer, transmitter, transmitter power, wika submersible pressure transmitter, wika transmitters, wireless, wireless field node, wireless gateway, wireless radio
Having fun with a cellular modem
Posted by danweise in Cellular, Communications, Wireless, Wireless on August 11, 2011
I just got my hands on a cellular modem that can stream analog data from a remote site to a SCADA/HMI/PLC/DCS/PAC, send a text message or an email on alarm, or receive a text message that can control a relay output (yes, it’s all secure ! !).
cellular modem, Modbus, SMS alarm, SMS email, Webinar, wireless
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