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News Release from: Quantum Research Group | Subject: QT114 QLevel "QT" sensor IC
Edited by the Engineeringtalk Editorial
Team on 24 May 2001
Level sensing IC senses 2 independent
trip points
Quantum Research Group's QT114 QLevel "QT" sensor IC is specifically designed to detect point level in fluids and powders through almost any dielectric, like glass, plastic or ceramic vessels
Quantum Research Group's QT114 QLevel "QT" sensor IC is specifically designed to detect point level in fluids and powders It has the unique capability of independently sensing two trip points when used with structured electrodes having two tiers
This article was originally published on Engineeringtalk on 3 May 2001 at 8.00am (UK)
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It will project a sense field through almost any dielectric, like glass, plastic, or ceramic, to sense level on the inside of a vessel, from its exterior.
The QT114 requires only a single inexpensive capacitor in order to function.
One or two LEDs can also be added to provide a visual sensing indication.
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Another unique feature is the 'slosh filter', a detection integrator which averages detections over a rolling 15 second interval before activating or deactivating the OUT pins.
This filter allows use of the QT114 with violently moving fluids, for example in a moving vehicle, that would otherwise cause the outputs to flicker between two states.
The QT114 employs Quantum's patented burst-mode charge transfer sensing methods and additional patent-pending methods.
The device also includes selectable output polarity, allowing both output lines to be made either active-high or active-low.
It also includes the Quantum-pioneered HeartBeat(tm) signal, allowing a host controller to monitor the health of the QT114 continuously if desired.
By using the charge transfer principle, the IC delivers a level of performance clearly superior to older technologies.
It is specifically designed to replace electromechanical devices like float switches, thermistors, and conductance probes.
Power consumption is under 20 microamps in most applications, allowing operation from Lithium cells for many years.
No external switches, opamps, or other analog components aside from Cs are required.
Quantum Research Group specializes in the design and manufacturing of QT sensor ICs for a wide variety of applications.
Visit their web site at www.qprox.com for datasheets, video demos, or to discuss related issues at their online forum.
Features: Tier level sensor -- hi/Low limits with one probe.
Only one external part required -- a 5½ capacitor.
Uses internal probes or external electrodes.
Active high or active low outputs.
Slosh filter averages response of moving fluids.
LED drive capable on both outputs.
2.5 to 5V 20mA single supply operation.
HeartBeat health indicator on both outputs.
Available in DIP, SOIC, die.
Applications: Process controls; Vending machines; Automotive fluids; Consumer appliances; Medical fluid sensing; Soil moisture sensing; Limit sensing of almost any fluid or powder.
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