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CrystalTwo Switch
Function
The INFICON® CrystalTwo Switch will allow a single Crystal Interface Unit (XIU) to
sequentially communicate to one of two crystal transducers. It may be used with any two
single type sensors or with a single dual sensor. The internal switching mechanism is
designed to minimize any loss of electrical signal through the device to very low levels
and will generally not have any effect on the measurement system’s performance or
crystal (Xtal) life.
Specifications
Part Number
779-220-G1 . . . . . . . . . . . . . . .CrystalTwo Switch with two 6” (152.4 mm)
INSTRUCTION SHEET
BNC cables
IPN 074-380-P1C
779-220-G2 . . . . . . . . . . . . . . .CrystalTwo Switch with two 20” (508 mm)
BNC cables
Input . . . . . . . . . . . . . . . . . . . . . . . . . quantity 1, female BNC
Output . . . . . . . . . . . . . . . . . . . . . . . quantity 2, female BNC
Operating frequency. . . . . . . . . . . . . 6.0 to 4.5 MHz
Insertion loss . . . . . . . . . . . . . . . . . . less than 1 dB at specified operating frequencies
Basic size . . . . . . . . . . . . . . . . . . . . . 1.5” (38.1 mm) hexagonal x 1.139” (28.931 mm)
Thick
Clearance for connectors . . . . . . . . . 2.5” (63.5 mm) radius from hexagon’s center
Mounting . . . . . . . . . . . . . . . . . . . . . 4 ea. #6-32 and 2 ea. #10-32 tapped holes for
mounting in various orientations
Switching voltage . . . . . . . . . . . . . . . 24 V AC or DC nominal, polarity independent
Switching power . . . . . . . . . . . . . . . . 200 mW, nominal
Control wires . . . . . . . . . . . . . . . . . . insulated hookup wire approximately 16”
(406.4 mm) long, inline rectifier module allows use
of AC or reverse polarity hookup
Temperature range. . . . . . . . . . . . . . 0 – 50°C
Humidity . . . . . . . . . . . . . . . . . . . . . . 5 – 85%
Switching time . . . . . . . . . . . . . . . . . less than 0.1 second; exclusive of measurement
instrument’s acquisition, optimization and
stabilization requirements
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CrystalTwo Switch
Accessories . . . . . . . . . . . . . . . . . . . two 6” (152.4 mm) male-male BNC cables for
Weight . . . . . . . . . . . . . . . . . . . . . . . 3.5 oz. (100 g)
Compatibility
The CrystalTwo Switch is compatible with all ModeLock Deposition Controllers. Refer to
your instrument operating manual for crystal switching details.
Installation
See Figure 1 and Figure 2. The CrystalTwo Switch requires 24 volt power to switch the
XIU to XTAL 2. In the un-powered condition the electrical connection is between the XIU
and XTAL 1. The 24 volt power may be either polarity of DC or AC; the inline rectifier
package insures that the switch is properly powered.
INSTRUCTION SHEET
attachment between CrystalTwo and
feedthroughs. Alternatively, a CrystalTwo Switch
with two 20” (508 mm) male-male BNC cables can
be purchased.
IPN 074-380-P1C
There are two 6” or two 20” BNC cables shipped with each CrystalTwo Switch. These
are to be used to connect the two outputs (XTAL 1 & XTAL 2) to the feedthrough of the
appropriate transducer. It is suggested that the cable supplied with the XIU be used to
connect the XIU to the terminal marked XIU on the CrystalTwo switch.
Rigidly mounting the switch is suggested, especially if there is a possibility of frequent
movement of the cables. There are 6 threaded mounting holes available for permanently
mounting the CrystalTwo Switch. Four #6-32 holes are available on the hexagonal base
and two #10-32 holes are available on one side face.
Integration With Controller
Coordination of the CrystalTwo Switch with the deposition process is very
straightforward. Use the Crystal Switch relay function with normally open contacts and
parallel the CrystalTwo Switch’s control wires with those of the Shutter Actuator control
valve. This will transfer electrical contact to the backup transducer as the shutter
exposes it.
It is normal for the controller to not use the information from the new crystal immediately
as it takes about one second for the measurement system to acquire and optimize the
resonance. There is also a built-in delay to allow the freshly exposed crystal to thermally
stabilize. This switching sequence normally lasts 5-6 seconds.
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INSTRUCTION SHEET
Xtal 1 Xtal 2
Xtal 1
Xtal 1
Xtal 2
Air
Supply
Parallel Electrical
Connection
Pneumatic Shutter
Activator Control
Valve
CrystalTwo
Switch
Rectifier
Package
XIU
CrystalTwo Switch
Figure 1 Typical Installation; CrystalTwo Switch and Dual Sensor
IPN 074-380-P1C
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Due to our continuing program of product improvements, specifications are subject to change without notice.
®
CrystalTwo Switch
INSTRUCTION SHEET
IPN 074-380-P1C
©2011 INFICON
Figure 2 Outline Drawing of CrystalTwo with Rectifier Package
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