Measure Resonant Frequency and Resistance Simultaneously!

A Quartz Crystal Microbalance (QCM) is a mass-sensitive detector which measures frequency changes of an oscillating quartz wafer. An oscillating electrical signal is passed between electrodes (usually Pt or Au) on either side of the thin slice of quartz crystal, resulting in an oscillation of that crystal at a frequency proportional to the mass of the crystal, as well as solution properties near the surface. As the mass of the crystal increases, frequency decreases. With proper experimental design and the QCM934, one can measure mass changes in the range of micrograms to fractions of nanograms. The greater the resonant frequency of the crystal, the greater the resolution and sensitivity to mass changes.

The QCM934 has improved the resonant frequency of the current QCM922 from 9MHz to 27MHz. Not only are the resolution and sensitivity improved, but the QCM934 now offers the options of temperature control and recording temperature changes. The frequency response of 25-27MHz provides excellent resolution of 0.01Hz and, because it uses the third overtone of a 9MHz crystal, the user avoids the extra expense of thinner, more delicate crystals that operate in that frequency range. The QCM934 offers expanded options to include up to four measurement channels in one unit, each capable of simultaneous measurements. Another new option is the dedicated measurement chamber for temperature control and the shielding of the most sensitive applications. We also offer four different cell options with different electrode materials.

• Latest evolution of the industry standard 384B Polarographic Analyzer Technology
• Experiment control from your PC under Microsoft^® Windows
• Upgrade 384B with 394 software
• Real-time plotting
• Overlay up to 9 files
• Auto-peak ID and zooming
• User-drawn baselines/tangents
• Calibration plots - Standard Addition and Standard Curve
• Autoexecute

• Sensitive enough to measure weight changes in a monolayer
• Quantify elastic and viscous changes in your system
• Front panel display of frequency and resistance
• Analog outputs for frequency and resistance
• Frequency range of 1 MHz to 10 MHz
• Designed for EQCM with a potentiostat or stand alone operation

• Renewable mercury electrode surface provides higher sensitivity
• Greater operating convenience than the traditional dropping mercury electrode (DEM)
• Reduces baseline distortions in DPP and enhances sensitivity
• Easily converts into an extremely stable HMDE for stripping or squarewave voltammetry
• Manual or automatic control of purge time, drop size, drop dispensing, and drop dislodgement
• Analytical calibration plots exhibit excellent day-to-day reproducibility

• Front-panel speed controls
• Remote analog speed control (input is summed with front-panel settings)
• Front-panel and remote (TTL) on/off switching (using PAR stir-control signals)
• Remote analog output for speed verification
• Integral ring-stand for convenient cell mounting
• A variety of electrode assemblies for a wide range of experiments, including: High-precision corrosion measurements, Ultra-trace analytical determinations, Automated Levich Plots, Hydrodynamically-modulated voltammetry, Cyclic stripping voltammetry

• Disk or Ring-Disk configuration
• Rotational speed to 10,000 RPM
• A variety of disk and ring-disk electrodes to choose from
• Quick-Change Electrodes for Corrosion Studies
• Cylindrical or Disk Electrodes for Corrosion Studies
• On/Off and Rotational Rate Control

• Continuous full-scale sensitivity control
• Sinewave of squarewave demodulation
• Powerful fourth-order signal channel Bandpass, Low Pass or Notch filter
• Two independent line frequency rejection filters
• Up to 130 dB Dynamic Reserve
• Synchronous 15-bit ADC for lower output jitter
• GPIB and RS232 interfaces included

• 0.001 Hz to 120 kHz operation
• Direct digital demodulation without downconversion
• 10 µs to 10 ks output time constant
• Quartz crystal stabilized internal oscillator
• Synchronous oscillator output for input offset reduction

• 10A and 20A options
• Interface available for 273 or 273A Potentiostat
• Operates in boosted or normal mode
• Separate interface connects to separate power booster
• Simple cable connection converts potentiostat from normal to boosted operation

• 8 A, 10A and 20A options
• Operates in boosted or normal mode
• Simple cable connection converts potentiostat from normal to boosted operation
• Stand-alone or computer-controlled operation
• Internal interface connects potentiostat to separate power booster
• Supplied as a complete system or to add-on to an existing 263A
• Compatible with Electrochemistry PowerSUITE^® software