LEM's Sentinel 3+ is a battery-monitoring transducer that measures
the voltage, temperature and impedance of cells and complete batteries in
uninterruptible power supply (UPS) installations of all sizes up to mega-watt
back-up power supplies for data centers and hospitals. Sentinel 3+ reports its
measurements - on valve-regulated lead-acid (VRLA), gel or flooded stationary
batteries - to supervisory systems over a dedicated communications bus, and
offers a unique capability to assess the true state-of-health of UPS batteries
while they are in service. Sentinel 3+ gives complete confidence that battery
arrays will deliver their rated power when called on to do so, and identifies
weak and failing cells without the need to remove them from service for cycling
Technology developments such
as the availability of fast insulated-gate bipolar transistors (IGBTs) reduce
costs by eliminating transformers from their circuit configurations. The
battery packs that the Sentinel product monitors are operated in a floating
voltage mode: the battery is subjected to higher ripple currents, and the
monitoring circuitry must handle high common-mode voltages, with superimposed
high-amplitude, fast transients.
LEM's Sentinel 3+ has upgraded
algorithms to address more challenging measurement environments and improved EMC
immunity and enhanced robustness. Sentinel 3+ delivers voltage measurements
over a range of 0.9 to 16 V with an accuracy of +/-0.5 percent; impedance
measurement from 0.05 to 250 mO with repeatability of +/-2 percent.
Sentinel 3+ features Common Mode Transient Immunity up to 20 kV/µsec with a
common-mode voltage level of +/-600 V, and a transient repetition rate of 20
With major product releases coming from big names like Sony, Microsoft, and Samsung, and big investments by companies like Facebook, 2015 could be the year that virtual reality (VR) and augmented reality (AR) finally pop. Here's take a look back at some of the technologies that got us here (for better and worse).
Good engineering designs are those that work in the real world; bad designs are those that don’t. If we agree to set our egos aside and let the real world be our guide, we can resolve nearly any disagreement.
The Industrial Internet of Things is bringing a previously reluctant process industry into the wireless fold. The ability to connect smart sensors to the Internet has spiked the demand for wireless devices in process manufacturing, according to the new study from ARC Advisory Group.
If you’re developing an embedded monitoring and control application, then you’ll want to take note of the upcoming Design News Continuing Education Center class, “Embedded Development Using Microchip Microcontrollers and the CCS C Compiler."
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.