Quartz Crystal Microbalance Digital Controller

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6 Getting Started Chapter 1Crystal InstallationThis section describes the procedure required to replace or install the QCM crystal in theCrystal Holder.Figure 5 shows the basic components of the Crystal Holder, including a standard 1 inchsensor crystal.side arm andBNC connectorCrystal holderheadcrystal cavityhead oringcontact springsretainer coverretainer ringsensor crystalliquid side upFigure 5. Crystal Holder components.The standard 1 inch diameter sensor crystal has two sides that must be clearly identifiedbefore this procedure is started:Contact SurfaceThe contact surface has two separate circuits and the smaller electrode pad.Figure 6. Contact Surface of QCM crystalQCM200 Quartz Crystal Microbalance
Chapter 1 Getting Started 7Liquid SurfaceThe liquid surface has the larger electrode pad, which connects through a wrap aroundpad to one of the circuits on the Contact Surface. This is the outside (i.e. modified)surface, in direct contact with the gas or liquid during QCM experiments.Figure 7. Liquid surface of QCM crystalIn order to insert a new crystal into the holder, the following steps must be followed:1. Place the Crystal Holder’s head on a flat surface, with its crystal cavity pointing up.The crystal cavity contains two spring-loaded contacts (POGO ® pins), which connectthe two Contact Surface circuits of the crystal to the BNC connector on the oppositeend of the probe.2. Inspect the head o-ring to make sure it is free of defects, clean and properly seated inits dovetail groove. The o-ring should be free of low spots and show sufficient heightabove the center ring when viewed from the side with the naked eye.3. Make sure the crystal cavity is clean and dry. Dry if necessary.4. Test the travel of the POGO ® contacts. Gently depress the POGO ® pins (a thinwooden applicator does a good job). Make sure that they travel freely (i.e. theirmotion is not restricted.) They should drop to a level well below the surface of theprobe o-ring (by an amount at least equal to the thickness of the crystal). When fullyextended, they should protrude above the surface of the o-ring, by an amount equal orlarger than the thickness of the sensor crystal.5. Inspect the sensor crystal at this time and clean it if necessary.QCM200 Quartz Crystal Microbalance
Page 1 and 2: Operation and Service ManualQCM200Q
Page 3 and 4: Safety and Preparation For UseiSafe
Page 5 and 6: ContentsiiiContentsSafety and Prepa
Page 7 and 8: OverviewvFront Panel OverviewFigure
Page 9 and 10: OverviewviiBack Panel OverviewFigur
Page 11 and 12: OverviewixQCM25 Crystal Oscillator
Page 13 and 14: SpecificationsxiSpecificationsQCM20
Page 15 and 16: Getting Started 1Chapter 1Getting S
Page 17 and 18: Chapter 1 Getting Started 3Quick St
Page 19: Chapter 1 Getting Started 5Paramete
Page 23 and 24: Chapter 1 Getting Started 98. Place
Page 25 and 26: Chapter 1 Getting Started 11Flow Ce
Page 27 and 28: Chapter 1 Getting Started 13Operati
Page 29 and 30: Theory, Operation and Calibration 1
Page 31 and 32: Chapter 2 Theory, Operation and Cal
Page 63 and 64: Sensor Crystals and Holders 49Chapt
Page 65 and 66: Chapter 3 Sensor Crystals and Holde
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Chapter 3 Sensor Crystals and Holde
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QCM Circuit Description 75Chapter 4
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Chapter 4 QCM Circuit Description 7
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Frequency Counter Selection Criteri
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QCM200 Remote Progamming 101Appendi
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Appendix B QCM200 Remote Programmin
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Appendix B QCM200 Remote Programmin
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Quartz Crystal Microbalance Digital Controller

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