This provides unlimited potential for the development of novel gas and biological sensors. Quartz crystals can be pre-coated with any thin film material including organic polymers, hydrogels, composites, ceramics, biomolecules, bacteria and living cells. The QCM200 is a valuable research tools for applications ranging from pure surface science to biochemistry.
The versatile QCM200 can be easily integrated into any custom 5 MHz crystal based EQCM setup.
#Quartzcrystal cost software
The potentiostat digitizes the voltage, and it's software displays relative frequency changes synchronous with the electrochemical data. The frequency analog output of the QCM controller is connected to the potentiostat A/D input. The figure below illustrates a typical EQCM experiment. This electrode is also transformer isolated, as required for EQCM operation. Only the front-surface electrode of the crystal is exposed to the solution. This provides an easy way of interfacing the QCM to a flow injection analysis system.įor EQCM applications, an analog output proportional to frequency shift may be directly connected to a potentiostat or galvanostat.
The holder and all crystals may be used in liquid or gas environments.Īn optional axial flow cell adapter attaches to the standard crystal holder. The crystal holder is a rugged, compact, easy to use fixture. Crystals are available in a variety of materials. The QCM200 uses a 5 MHz, 1" diameter, AT-cut quartz crystal wafer with circular electrodes on both sides. In the QCM200, the digital controller also contains a frequency counter with 0.01 Hz resolution for accurate frequency measurements, and a resistance meter with 5 digits of resolution covering a range of 0 to 5000 Ω.
#Quartzcrystal cost series
Proper capacitance cancellation is required to assure true series resonance operation of the crystal oscillator, and to eliminate frequency and resistance errors. The controller provides power to the crystal oscillator electronics, and includes a potentiometer for canceling shunt capacitance. It also monitors the energy dissipated by the sensor, which is used to determine the series resistance of the crystal. For special applications requiring optimum long-term frequency stability, a precision timebase, such as the FS725 Rubidium Frequency Standard, can be connected to the external 10 MHz input.Ī unique automatic gain control circuit provides the quartz crystal with the required signal amplitude to overcome viscoelastic losses and achieve series resonance. The stability and accuracy of the QCM200 are ideal for most experiments. User-tags are provided to time-stamp important events. Both frequency and resistance trends can be viewed. Windows software is provided for real-time data acquisition, display, analysis and storage.
#Quartzcrystal cost Pc
The QCM200 can be operated from the front panel or a PC using the RS-232 interface. Series resonance frequency and resistance are measured and displayed, and there is an analog output proportional to frequency which can be used to interface with a potentiostat. The QCM200 is a stand-alone instrument with a built-in frequency counter and resistance meter. Specifically designed to handle heavy loads (up to 5 kΩ), the instruments will lossy films and highly viscous liquids.
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