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California Water Utility Uses RFID to Reduce Terrorism Risk
RFID interrogators are currently installed at five of Alco's nine pump stations, as well as at its administrative office and a maintenance shop. (Over the next two years, Chaabane says, the company plans to install readers at its four remaining pump stations.) Because of the system's long read range, detecting the tags poses no problems—in fact, he says, the readers at each pump station were tuned down so that they would detect tags only when located within the stations, in order to ensure that the tags of assets and employees located outside of the stations were not read.
Chaabane says he was initially concerned that variable frequency drives inside the stations, which control the speed of the water pumps' electric motors, would generate RF interference with the RFID system. Upon testing, however, this proved not to be an issue, because these devices do not operate in the 433 MHz band.
The software is currently operating in a standalone status, but will soon be integrated into Alco's time-and-attendance software. While the company has no plans to use the RFID reads to determine each worker's pay, employees can use the tag-read history log to check times, such as how late they worked on a specific day, or when they arrived at a pump station or the maintenance shop.
Water systems are particularly vulnerable during power outages, so if electricity is lost at any facility or pump station, the interrogators deployed will switch to a battery-based, uninterruptible power supply for up to 30 minutes. Then, if the power is still out, a fuel-powered generator will kick in.
The system has been in place for 18 months, Chaabane says, having been rolled out permanently after being tested on a small scale for a few months. To date, he adds, Alco has spent approximately $100,000 for the entire system, though he estimates that the company has already seen a return on its investment through improved asset utilization, as well as by avoiding having to replace lost assets.
When searching for a particular asset, an employee can reference the AssetGather software to determine where and when that item was last detected by an RFID reader. This can save considerable time in hunting for the asset—especially when it eliminates the need to drive out to a remote pump station to search for it, or one like it. Because personnel spend less time looking for equipment, Chaabane notes, productivity has improved without any increase in labor spending. What's more, he says, Alco has saved money by virtue of no longer misplacing high-value assets and subsequently having to replace them.
Chaabane says he was initially concerned that variable frequency drives inside the stations, which control the speed of the water pumps' electric motors, would generate RF interference with the RFID system. Upon testing, however, this proved not to be an issue, because these devices do not operate in the 433 MHz band.
The software is currently operating in a standalone status, but will soon be integrated into Alco's time-and-attendance software. While the company has no plans to use the RFID reads to determine each worker's pay, employees can use the tag-read history log to check times, such as how late they worked on a specific day, or when they arrived at a pump station or the maintenance shop.
Water systems are particularly vulnerable during power outages, so if electricity is lost at any facility or pump station, the interrogators deployed will switch to a battery-based, uninterruptible power supply for up to 30 minutes. Then, if the power is still out, a fuel-powered generator will kick in.
When searching for a particular asset, an employee can reference the AssetGather software to determine where and when that item was last detected by an RFID reader. This can save considerable time in hunting for the asset—especially when it eliminates the need to drive out to a remote pump station to search for it, or one like it. Because personnel spend less time looking for equipment, Chaabane notes, productivity has improved without any increase in labor spending. What's more, he says, Alco has saved money by virtue of no longer misplacing high-value assets and subsequently having to replace them.
