QT114-S

QT114-S DESCRIPTION -

The QT114 QuickLevel(cid:153) charge-transfer ((cid:147)QT(cid:148)) sensor IC is specifically designed to detect point level in fluidsand powders. It will project a sense field through almost any dielectric, like glass, plastic, or ceramic, to senselevel on the inside of a vessel, from its exterior. It has the unique capability of independently sensing two trippoints when used with structured electrodes having two tiers.The QT114 does not have sensing timeouts, drift compensation, or other functions which would interfere withlevel sensing. Its threshold levels are fixed, and the amount of signal required to exceed a threshold is dependenton circuit gain and electrode size and loading, all of which are under the control of the designer.The QT114 requires only a single inexpensive capacitor in order to function. One or two LEDs can also be addedto provide a visual sensing indication.Power consumption is under 20mA in most applications, allowing operation from Lithium cells for many years. Inmost cases the power supply needs only minimal regulation.The QT114 employs numerous signal acquisition and processing techniques pioneered by Quantum. No externalswitches, opamps, or other analog components aside from CS are required.A unique feature is the ’slosh filter’, a detection integrator which averages detections over a rolling 15 secondinterval before activating or deactivating the OUT pins. This filter allows use of the QT114 with violently movingfluids, for example in a moving vehicle, that would otherwise cause the outputs to flicker between two states.The device also includes selectable output polarity, allowing both output lines to be made either active-high oractive-low. It also includes the Quantum-pioneered HeartBeat(cid:153) signal, allowing a host controller to monitor thehealth of the QT114 continuously if desired. By using the charge transfer principle, the IC delivers a level ofperformance clearly superior to older technologies. It is specifically designed to replace electromechanicaldevices like float switches, thermistors, and conductance probes.TA00C to +700C-400C to +850CAVAILABLE OPTIONSSOICQT114-SQT114-IS8-PIN DIPQT114-D-

QT114-S APPLICATIONS -

! Process controls! Vending machines! Automotive fluids! Consumer appliances! Medical fluid sensing! Soil moisture sensingVccOut1Out2Filt1234