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Quartz Crystals
Intellemetrics
makes Quartz Crystal Controllers and Quartz Crystal Monitors
and therefore Quartz Crystal quality is paramount to us.
Intellemetrics
has therefore introduced a range of competitively priced, yet
high quality crystals to satisfy the diverse needs of our customers.
The range now includes those listed below. For the most demanding
of applications, we recommend the high precision SN66HG crystals.
If you require
help in choosing the optimum crystals for your application
or wish to make a repeat order, please email enquiries-crystals@intellemetrics.com
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Our
Crystals are 100% Compatible with Intellemetrics,
Balzers and Inficon sensor heads!
You can now order online and
make secure payment via PayPal
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All crystals are 14mm
diameter and provided in rotary dispensers in quantities of ten.
All crystals are AT-cut and low thermal coefficient.
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Part
Number
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Electrode
Pattern
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Nominal
Centre Frequency (MHz)
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Centre
Frequency Precision (± kHz)
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Coating
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Pack
of 10 Price
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Despatch
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SN66HG
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Intellemetrics
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6
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3.0
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Gold
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£61
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Next
day
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SN66BG
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Intellemetrics
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6
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6.0
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Gold
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£54
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Next
day
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SN66BA
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Intellemetrics
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6
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6.0
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Alloy
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£54
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14
days
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SN66BS
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Intellemetrics
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6
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6.0
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Silver
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£54
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14
days
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SN65NG
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Balzers
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5
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7.5
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Gold
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£58
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14
days
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SN65NA
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Balzers
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5
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7.5
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Alloy
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£58
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14
days
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SN65NS
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Balzers
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5
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7.5
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Silver
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£58
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14
days
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SN66NG
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Inficon
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6
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10.0
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Gold
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£58
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Next
Day
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SN66NA
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Inficon
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6
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10.0
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Alloy
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£58
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14
days  |
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SN66NS
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Inficon
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6
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10.0
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Silver
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£58
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14
days
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Postage & Handling
The prices shown below
are fixed for 1 to 10 packets (See Minimum Order Quantity below),
i.e. they are independent of the number of packets ordered.
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UK
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£12
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Postage
within the UK is via Royal Mail Special Delivery™ Next
Day.
Postage
outside the UK is via Royal Mail Airsure®
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Europe
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£15
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World-Wide
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£20
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Ordering
Instructions
All prices given
above are excluding VAT or other duties that may be applicable.
Therefore total price
= ( Pack of 10 Price x Number of Packs ) + Postage & Handling +
VAT if applicable.
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Order Quantities |
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Customers
within the UK: 2 Packs of 10 |
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Customers outwith
the UK: 5 Packs of 10 |
Parties
wishing to purchase crystals should email a valid Purchase Order to enquiries-crystals@intellemetrics.com or
fax it to +44 (0)141 882 9223.
Parties who already
have trading accounts with Intellemetrics will have goods despatched
as soon as available and will receive an invoice within 30 days.
Parties who do not
have a trading account with Intellemetrics will be required to make
full payment before goods are despatched.
Notes
on Extending Crystal Life
A
very general and approximate guide figure for the thickness at which
a quartz crystal will fail is 30um.
The
crystal fails when the accumulation of deposited layers peel off under
stress. The stress becomes higher as the layers build up and is further
increased if several different materials are deposited on one crystal.
Interlayer
stress is increased if multiple materials are deposited on the crystal.
Interlayer
stress is much higher for some materials such as magnesium fluoride
(MgF) which leads to short crystal life. Intellemetrics can provide
alloy coated crystals which reduce the stress between the crystal and
the first deposited layer of MgF. Customers have observed an increase
in crystal life by a factor of 2.5 when changing from gold or silver
coated crystals to alloy coated crystals.
Crystal
life can be extended by placing the crystal further away from the source
but this also reduces sensitivity as less evaporant falls on it. The
Intellemetrics IL820 has a feature called sample and hold described
in the manual. A single crystal shuttered head is required. Sample
and hold is suitable for a process with stable evaporation rates and
saves the crystal by only looking at the source for long enough to
bring the rate under control and then closing the shutter for a while.
When the shutter is closed, the IL820 extrapolates the thickness and
holds the source power constant until the next sampling period when
the rate can again be adjusted.
Double
crystal sensor heads are also available. The second crystal is left
covered and therefore provides a standby should the first crystal fail,
thus avoiding losses due to failure during a run.
For
the most accurate thickness readings or the finest rate control, a
fresh crystal should be used for each deposition run. This is required
when one is approaching the limit of the resolution of the IL820 instrument
which is 0.001nm and 0.001nm/second.
 Contact
us today for a quote...
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