MAINTENANCE and INSTALLATION MANUAL
CHC-15 Crystal Holder
GC-15 Glass Cell
IPN 623800 Rev. D
MAINTENANCE and INSTALLATION MANUAL
CHC-15 Crystal Holder
GC-15 Glass Cell
IPN 623800 Rev. D
®
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Due to our continuing program of product improvements, specifications are subject to change without notice.
©2007 INFICON
Trademarks
The trademarks of the products mentioned in this manual are held by the companies that
produce them.
INFICON® is a trademark of INFICON Inc.
All other brand and product names are trademarks or registered trademarks of their respective companies.
Disclaimer
The information contained in this manual is believed to be accurate and reliable. However, INFICON assumes
no responsibility for its use and shall not be liable for any special, incidental, or consequential damages related
to the use of this product.
Disclosure
The disclosure of this information is to assist owners of INFICON equipment to properly operate and maintain
their equipment, and does not constitute the release of rights thereof. Reproduction of this information and
equipment described herein is prohibited without prior written consent from INFICON, Two Technology Place,
East Syracuse, NY 13057-9714. Phone 315.434.1100. See www.inficon.com.
Copyright
©2006 All rights reserved.
Reproduction or adaptation of any part of this document without permission is unlawful.
First Edition, March 2006. Revision B
Rev. C - October 2007
Rev. D - November 2007
WARNING
All standard safety procedures associated with the safe
handling of electrical equipment must be observed. Always
disconnect power when working inside the controller. Only
properly trained personnel should attempt to service the
instrument.
Warranty
INFICON warrants the product to be free of functional defects in material and
workmanship and that it will perform in accordance with its published specification
for a period of (twelve) 12 months.
The foregoing warranty is subject to the condition that the product be properly
operated in accordance with instructions provided by INFICON or has not been
subjected to improper installation or abuse, misuse, negligence, accident,
corrosion, or damage during shipment.
Purchaser's sole and exclusive remedy under the above warranty is limited to, at
INFICON's option, repair or replacement of defective equipment or return to
purchaser of the original purchase price. Transportation charges must be prepaid
and upon examination by INFICON the equipment must be found not to comply
with the above warranty. In the event that INFICON elects to refund the purchase
price, the equipment shall be the property of INFICON.
This warranty is in lieu of all other warranties, expressed or implied and
constitutes fulfillment of all of INFICON's liabilities to the purchaser. INFICON
does not warrant that the product can be used for any particular purpose other
than that covered by the applicable specifications. INFICON assumes no liability in
any event, for consequential damages, for anticipated or lost profits, incidental
damage of loss of time or other losses incurred by the purchaser or third party in
connection with products covered by this warranty or otherwise.
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TABLE OF CONTENTS
1 SPECIFICATIONS........................................................................................................1
1.1.1 CH-15 CRYSTAL HOLDER ......................................................1
1.1.2 GC-15 GLASS CELL..................................................................1
1.2 ORDERING INFORMATION...........................................................................1
2 CRYSTAL HOLDER DESCRIPTION .......................................................................2
2.1.1 HOW TO INSTALL A CRYSTAL IN A INFICON
CRYSTAL HOLDER..............................................................................2
2.1.2 HOLDER CARE AND HANDLING..........................................6
2.2 1 INCH DIAMETER CRYSTALS......................................................................7
2.2.1 ELECTRODE CONFIGURATION ............................................7
2.2.2 CRYSTAL PARAMETERS........................................................8
2.2.3 CRYSTAL SURFACE FINISH ..................................................8
2.2.4 CRYSTAL ELECTRODE MATERIALS...................................8
2.2.5 CRYSTAL THICKNESS ............................................................9
TABLE OF FIGURES
Figure 1 CHC-15 Crystal Holder...................................................................................................2
Figure 2 CHC-15 & GC Installation & Part Identification............................................................4
Figure 3 CHC-15 Parts Identifications ..........................................................................................5
Figure 4 Crystal Installation ..........................................................................................................5
Figure 5 INFICON 1-Inch Diameter Crystals – Electrode Configuration.........................................7
Figure 6 INFICON 1" Crystal - as Seen From The Front Side .........................................................8
1 SPECIFICATIONS
1.1.1 CH-15 CRYSTAL HOLDER
Material: CPVC
O-Ring: Viton® Size: 2-019
Temperature Range: -25°C to 95°C
Connector: SMB
1.1.2 GC-15 GLASS CELL
Material: Pyrex Glass
O-Ring: Viton® Size: 2-116
Approx. Volume of Water: 45 mL
Temperature Range: 20°C to 300°C
1.2 ORDERING INFORMATION
Part Number Description
623204 CHC-15 with GC-15 Kit
623201 CHC-15 Crystal Holder (CPVC)
623202 GC-15 Glass Cell
803339 Stopper
803252 Glass Cell O-Ring
889095 Pogo Contacts
803251 Crystal Holder O-Ring
603216-2 Cable 2’ SMB – SMB Plug
803338 Clamp – Pinch, Stainless #28
Page 1
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
2 CRYSTAL HOLDER DESCRIPTION
The CHC-15 Crystal Holder is designed to mate with a ChemGlass O-ring Joint P/N CG-124-04 or
equivalent. This allows the user to create his own experimental cell around the O-ring Joint.
Figure 1 shows a INFICON CHC-15 Crystal Holder. It has a cavity for a 1-inch diameter crystal. Inside
the cavity there are two Pogo® pins providing connections to the crystal’s front and rear electrodes.
Note the locations of the Pogo® pins. These pins are internally connected to the SMB connector. Also
note the location of the index hole that identifies the crystal orientation.
SMB
Connector
Index Hole
Figure 1 CHC-15 Crystal Holder
2.1.1 HOW TO INSTALL A CRYSTAL IN A INFICON CRYSTAL HOLDER
Since the crystals have to be changed periodically, this is an important step with which to become
thoroughly familiar:
1. Identify the Front and Rear Sides of the crystal. See Section 2.2.1.
2. Clean & Dry the Crystal Holder cavity.
3. Place the CHC-15 between your index finger and your middle finger with the Index pin
of the CHC-15 at the 3 O’clock line (Refer to Picture 1).
4. Then insert the Crystal with the Front Side (Sensing Electrode) exposed. The “Wrap-
around Extended Electrode” MUST be in the 60º region as in Figure 4 below.
3. Place the O-Ring (provided with the glass joint) over the Crystal.
4. Fit the glass joint on top of the o-ring. Make sure it is centered on the CHC-15.
5. Secure the assembly with a clamp (ChemGlass P/N CG-150-05) as shown in Picture 4.
6. Tilt the cell when filling with liquid, so air isn’t trapped at the crystal surface. Fill with
enough liquid to cover the crystal completely.
Page 2
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
Assembly Illustration Shown with GC-15 Glass Cell
Picture 1 Picture 2
Picture 3 Picture 4
Page 3
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
CHC-15 CRYSTAL HOLDER (CPVC)
(P/N 623201)
STOPPER
(P/N 803339)
CRYSTAL
GLASS CELL O-RING
(P/N 803252)
Figure 2 CHC-15 & GC Installation & Part Identification
Page 4
GC-15 GLASS CELL
(P/N 623203)
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
Figure 3 CHC-15 Parts Identifications
Figure 4 Crystal Installation
Page 5
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
2.1.2 HOLDER CARE AND HANDLING
With a robust design, INFICON crystal holder requires little care. However, the crystal holder is in direct
contact with the sensor crystal and your experiment environment. Thus, care must be taken to ensure its
cleanliness eliminating any contaminants that may react with the crystal or the experiment media. The
following guidelines are recommended for general handling of the holders.
♦ Always keep the holder clean and dry when not in use.
♦ Always use clean room grade gloves while handling the holder and its components.
♦ Never handle the holder with bare hands as human skin oils may deposit on it and react with your
experiment.
♦ Always rinse the holder generously with deionized water and thoroughly blow dry using filtered
air after each experiment. This is especially important if the holder has been exposed to oxidizing
acids.
♦ Always act fast in the event that liquids or chemicals have entered the crystal cavity in the holder.
Immediately clean the holder using the following procedure.
o Remove the crystal to expose the crystal cavity.
o Remove both Pogo® contact pins from their sockets. Use a pair of tweezers (or gloved
fingernail), grab the Pogo® head firmly and pull it straight out of its socket.
o Rinse the holder, the crystal cavity and the Pogo® sockets generously with deionized
water to remove all traces of chemicals and thoroughly blow-dry the whole holder using
filtered air. Ensure all liquids that may have been trapped inside the sockets are
removed.
o Generously rinse the Pogo® contact pins with deionized water, occasionally squeeze the
pins to push out any liquids that may have been trapped inside the pins. Thoroughly
blow-dry the pins using filtered air.
o Install the Pogo® pins back into their sockets. Use the tip of a pair of tweezers and push
down on each Pogo® pins to verify their deflection.
♦ It is always a good idea to inspect the O-ring and test the travel of the Pogo contacts whenever the
crystal is being replaced.
♦ Check the general appearance of the O-ring. It should be free of any deposits or defects when
viewed with the naked eye. Inspect it from the side for low spots or insufficient height above the
center ring.
♦ Gently depress the pogo pins. Make sure that they move freely and that travel is not restricted.
They should depress to a level well below the surface of the O-ring, at least by an amount equal to
the thickness of the crystal. When extended they should extend well above the surface of the O-ring.
Again, at least by an amount equal to the crystal thickness.
Page 6
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
2.2 1 INCH DIAMETER CRYSTALS
INFICON pioneered the standard AT-cut, 5 MHz, 1-inch diameter crystals for use in liquid applications.
The
AT-cut quartz is chosen for its superior mechanical and piezoelectric properties, and the angle of cut
adjusted to obtain a zero temperature coefficient at a desired operating temperature. The 1 inch
can be
dia
meter was chosen to allow enough distance between the active area of the crystal and the mounting o-
This improves the overall stability of the crystal by reducing the frequency changes due to
ring.
mounting stress.
2.2.1 ELECTRODE CONFIGURATION
Figure 5 below shows INFICON’s 1” crystal electrode patterns. The left figure shows the ½ inch diameter
front electrode (al
ystal and extends into a semicircle shown in the top half of the right figure. The lower half of the
the cr
right figure shows the ¼ inch diameter rear electrode (also called contact electrode).
so called sensing electrode) with an extended electrode that wraps around the edge of
This configuration enables both electrical contacts to be
made on the backside of the crystal allowing
measurement in conductive liquids.
The oversized front electrode (½ inch in dia
cho
sen to ensure a more consistence deposition across the active area of the crystal. The exposed area of
the front electrode is 0.212 i
2
(137 mm2), but the active oscillation region (displacement area) is limited
n
to the overlapping area of the front and rear electrodes (0.053 i
meter as oppose to the ¼ inch diameter rear electrode) was
2
or 34.19 mm2).
n
Figure 5NNN 1-Inch Diameter Crystals – Electrode Configuration
Page 7
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
The figure below shows a INFICON 1” diameter as seen from the front side.
Figure 6. 1" Crystal - as Seen From The Front Side
2.2.2 CRYSTAL PARAMETERS
Polished one-inch diameter crystals that are commonly available for liquid work have the typical values
as listed below.
pe Frequency
Ty
(MHz)
Range
5 MHz 4.976 – 5.020 Gold ~10 120,000
9 MHz 8.976 – 9.036 Gold ~7 55,000
2.2.3 CRYSTAL SURFACE FINISH
Studies have shown that electrode surface roughness can cause large apparent mass loadings due to the
liquid that is trapped within pores at the c
Å average surface roughness to
ment between theory and measurement during liquid immersion experiments. Polished crystals are
e
agre
also required to obtain
Non-polished c
require the accura
2.2.4 CRYSTAL ELECTRODE MATERIALS
INFICON’s crystals are available in a variety of electrode materials including Gold, Platinum, Aluminum,
Silver, Titani
create a
h
r
m, etc. INFICON also offers Gold electrode crystals with an additional SiO2 outer layer to
u
ydrophilic surface needed for some biological applications.
measurements reproducibility from crystal to crystal2.
ystals (Ra=1.8 microns) are also available at reduced costs for applications that do not
c
y and reproducibility of the polished crystals.
Electrode
Material
minimize this effect. Polished crystals are required to obtain good
Resistance
(ohms)
ystal surface 1. INFICON’s crystals are optically polished to 50
r
Q Factor
Pag
8
e
CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
2.2.5 CRYSTAL THICKNESS
INFICON AT cut, 1-inch diameter crystals are plano-plano. Their physical thickness is determined by a
frequency constant and their final frequency. The frequency constant for an AT cut crystal is 1.668E5
Hz × cm or 65.5 kHz × in. Therefore, the crystal thicknesses for various frequencies are as follows.
5 MHz AT cut thickness = 333 microns (0.013 inch)
6 MHz AT cut thickness = 227 microns (0.0109 inch)
9 MHz AT cut thickness = 185 microns (0.007 inch)
Footnotes
1
Martin, Stephen, et. al., “Effect of Surface Roughness on the Response of Thickness-Shear Mode
Resonators in Liquids”, Anal. Chem., 65 (1993) 2910.
2
Sullivan, C. K. and Guilbault, G.G. “Commercial Quartz Crystal Microbalances- theory and
applications”, Biosensors and Bioelectronics 14 (1999) 663-670.
Page 9
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