eQCM-I Mini Quartz Crystal Microbalance

with Impedance Measurement and Dissipation

The eQCM-I Quartz Crystal Microbalance is a high-sensitivity mass sensor which measures the change in frequency and dissipation of a quartz crystal resonator and any adsorbed film.  eQCMs are useful in any number of applications because you combine electrochemical measurements with mass measurments to gain further insight into what drives mass changes (and elasticity changes) within films.  

The QCM-I, QCM-I Mini, and eQCM-I Mini are manufactured by MicroVacuum Ltd. (http://www.owls-sensors.com/) of Budapest, Hungary. MicroVacuum has integrated control of our USB-based potentiostats into their BioSense software (V3 or higher). Gamry has partnered with MicroVacuum for distribution of these instruments in the United States and China. Inquiries outside of the US and China can go directly to MicroVacuum (http://www.owls-sensors.com/contactus). 

eQCM-I Mini Product Details

The resonant frequency and the bandwidth of the resonant conductance curve are determined. The bandwidth or full width at half maximum, (FWHM) is direct correlation with the quality factor (Q) which is by definition the inverse of the well known dissipation (D).

eQCM-I Mini Features:

  • Both the frequency and the quality of resonance (FWHM or bandwidth or dissipation) are measured
  • Different harmonics (up to the 13th overtone at 5MHz crystals) can be quickly and sequentially measured
  • Temperature control from 4°C to 80°C (± 0,02 °C) is included
  • EC measurement module is optionally available with ITO-QCM sensors
  • Modular sensor holder up to 4 measuring channels
  • External PC with Windows® 10; communication with QCM-I via USB

qcm i software control measurement

 The software performs full control of the eQCM-I Mini Instrument.  Two measurement modes are available:

  1. Resonance:  Measurement of resonance curve and calculation of the resonance frequency & FWHM up to 70 MHz
  2. QCM-t:  Continuous measurement of the resonance parameters and the temperature of the flow-cell.

Calculation:  Various eQCM and ad-layer parameters can be calculated using standard or custom made models.  All these parameters can be displayed on the screen, printed, saved or can be exported for further evaluation.

What's Included:

  • eQCM unit with two channels (one channel is temperature controlled)
  • Microsoft® Surface Pro Tablet with Windows® 10 Pro
  • QSH-104 QCM Sensor Holder (flow through type)
  • QSHE-104 QCM Sensor Holder (flow through type) with "leak free" Ag/AgCl reference electrode
  • BioSense EC 3.xx Software (one user license)

*Potentiostat Not Included

*Gamry is the exclusive distributor of MicroVacuum for the United States and China.  For information on other MicroVacuum Products or inquiries outside of the US & China, please visit their web site

eQCM-I Mini Specifications

TECHNICAL INFORMATION

Measuring Principle

The EQCM-I Mini unit is a high sensitivity mass sensor which measures
the change in frequency of a quartz crystal resonator and
as a label free biosensor it measures the “wet mass” of the
adsorbed layer in processes occurring at or near the sensor
surface. The measuring principle is based on impedance analysis
of the quartz crystal. The resonant frequency (fres) and the
bandwidth of the resonant conductance curve are determined.
The bandwidth or full width at half maximum (FWHM) is in direct
correlation with the quality factor (Q) which is by definition
the inverse of the well known dissipation (D).

Measurement Channels 1-4
Frequency Range 1-80 MHz,up to the 13th overtone for a 5 MHz Crystal
Working Temperature

4° C to 80° C, controlled manually or via software,
stability ± 0.02° C

Sample Loading

Sample injection with external syringe or peristaltic pump unit
controlled manually or by BioSense software, and Rheodyne
Model 9725 manual injector valve, or Rheodyne MX series
semiautomatic switching valve.
Optional external Auto sampler unit is available

Flow Cell Volume

~ 40 µl (typical with Ø14 mm crystals)
Typical Flow Rates 0.01µl/min - 35ml/min with external syringe pump,
Syringe size 1-60 ml
Sample Volume  1 to 2000 µl (depends on installed loop volume)
Wetted parts  PTFE, PEEK, SS, VITON or Kalrez

MEASUREMENT SENSITIVITY

Standard Resonance Frequency sensitivity ~2 x 10-1 Hz
Standard Dissipation Sensitivity in Liquid ~ 1 x 10-7
Mass Sensitivity in Liquid ≤ 1 ng/ cm2

SENSORS

Sensor Crystal 5 MHz, AT-cut, modular sensor holder accommodates
either 14 mm or 1” inch diameter crystals
See more details inQCM sensor datasheets.

SOFTWARE

BioSense  Universal software platform for OWLS, QCM & EC measurements
See more details in BioSense datasheet.
Import/Export of the measured data Between separate BioSense software and export to third party software
Excel, JPG, BPM, WMF etc.
PC Requirement USB 2.0, works with MS Windows® 7 or 8 or 10

ELECTRICAL

Supply Voltage DC power supply with universal input voltage from
100V to 240V AC & 50 to 60 Hz.

eQCM-I Mini Manuals

eQCM-I Mini Accessories

Accessories:

  • QSH-014 - QCM sensor holder with flow cell for 14 mm crystals (Part #974-00001)
  • QSHE-014 - eQCM holder for electrochemical QCM measurements for 14 mm crystals (Part #974-00002)
  • O-ring kit for QSH-014 -- 1 pc 12x2mm Silicone with Au wires, 3 pcs 12x2mm Viton (Part #974-00016)
  • O-ring kit for QSHE-014 (1 pc 12x2mm Silicone with Au wires, 3 pcs 12x2mm Viton, 2 pcs 4x1mm Silicone) (Part #974-00017)
  • Pt counter electrode kit for QSHE-014 (Ø 6mm with M2 nut) (Part #974-00018)
  • Leak-free reference electrode (Ag/AgCl) for QSHE-014 with sealing kit (Part #974-00019)
  • PCB-kit for QSH-014 with M2.5 screws (Part #974-00020)
  • Nut and ferrule set (5 sets of P259 flangeless ferrules and P252 nuts 1/4-28 flat bottom) (Part #974-00022)
  • Nut and ferrule set (5 sets of M650 flangeless ferrules and M644-03 nuts 6-40 flat bottom) (Part #974-00023)
  • Luer (female) connector with 1/4-28 union  (Part #974-00024)
  • Perifit to connect Teflon tube to Tygon pump tube, PEEK, fits nut MV-SP-007 (Part #974-00025)
  • FEP tubing (OD 1/16”, ID 0.03”, 10ft long) (Part #974-00026)
  • RF cable-kit (200 mm long) to connect remote QCM sensor holder to main unit (Part #974-00027)
  • Cleaning holder to hold six (6) crystals, PEEK (Part #974-00028)
  • RF calibration-kit for service purposes (Part #974-00029)
  • Calibration-kit for training purposes (Part #974-00030)
  • Test electrical cable with 1mm banana socket and 2mm banana socket, Silicone, 500mm long (Part #974-00031)
  • Test electrical cable with 1mm banana socket and 4mm banana socket, Silicone, 500mm long (Part #974-00032)
  • Test electrical cable with 2mm banana plug and 2mm banana socket, Silicone, 500mm long (Part #974-00033)
  • Test electrical cable with 2mm banana plug and 4mm banana socket, Silicone, 500mm long (Part #974-00034)
  • QSH-dip - QCM sensor holder for dip-in applications (Part #974-00003)
  • QSH-vac - QCM sensor holder for vacuum applications (Part #974-00004)
  • QSH-HT-HP - QCM sensor holder for high temperature and high pressure applications (Part #974-00005)
  • QSH-ext - extension RF cable assembly for remote QCM sensor holder (Part #974-00006)
  • QMH - QCM measuring head with temperature control (Part #974-00007)
  • UVO - mini UV Ozone cleaner (Part #974-00008)
  • PSC-10 - plasma surface cleaner (Part #974-00009)
  • SYR-2 - two-channel syringe pump (Part #974-00010)
  • SASV - semi-automatic switching valve with BioSense 3.xx software module (Part #974-00011)
  • BioSense - BioSense 3.xx software, second user license (Part #974-00012)
  • BioSense upgrade - BioSense 2.xx software upgrade to BioSense 3.xx (Part #974-00013)
  • BioSense EC upgrade - BioSense 3.xx software upgrade to BioSense EC 3.xx (Part #974-00014)
  • Customer training - customer training via internet (max. 4 hours) to use the QCM and Biosense (Part #974-00015)


Quartz Crystals
Available at the Gamry On-Line Store

Application Notes