BRKM-P Datasheet | Advanced XTAL Products

DIFFERENTIAL PRESSURE SENSING QUARTZ CRYSTAL RESONATOR BLOCK BRKM-P APPLICATIONS BRKM-P is a quartz crystal resonator assembly, which consists of a measuring and a reference quartz crystal, both packaged in a rectangular enclosure. The resonance frequency varies with pressure-induced stress. BRKM-P is designed as a ponent for precision electronic differential pressure transducers, manometers and controllers with a frequency output for conversion of absolute pressure or differential pressure to frequency. High resolution and accuracy Long term quartz crystal stability Wide temperature range (-55…+80 °C) Low power consumption Suitable for precision pressure equipment .. Features In gauges of differential pressure BRKM-P is used to convert a pressure difference to a differential frequency output signal fout =fMEASURING - fREFERENCE. An absolute pressure ( or differential pressure) P1 is applied to diaphragm (1), while the absolute atmospheric pressure (basic pressure) Р2 acts on diaphragm (3) (see drawing below), which stresses the reference resonator through the metal pipe (6). One end of the connecting pipe is attached to an outlet of the quartz block, and the second one to an internal cavity of the case of the gauge (5) where BRKM-P is subjected to the pressure Р1. The internal cavity of the gauge is usually filled up by oil. ELECTRICAL CHARACTERISTICS (at normal climatic conditions) / OPERATING CONDITIONS PARAMETERS Frequency Range, fO Resonance Resistance typ./max., Rr Drive Level max., DL Insulation Resistance min. SPECIFICATIONS AND REMARKS Electrical characteristics 32.000…48.000 200 / 250 3.0 400 Motional characteristics UNITS kHz kΩ µW MΩ f(P)=fO +A1- P +A2- P2+ A3- P3 where: f(P) - crystal frequency at pressure P (Hz), fO - crystal’s...