CCM501 FAQ

What is the principle of operation?
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The double inverted magnetron cold cathode sensor is made up of a cylindrical cathode (the envelope) surrounding a cylindrical wire or rod called the anode. Two opposing cylindrical magnets are used to create an axial magnetic field relative to the anode and cathode. When the gauge is operating, a high voltage potential of about 4KV is generated between the cathode and anode. At sufficiently low pressures, an electron plasma is started when an electron is removed from the cathode. The plasma is a charged electron cloud which is trapped inside the magnetic field between the anode and the cathode. Electrons inside the cloud will impact a gas molecule removing an electron which creates an ion. As ions are created they will be attracted and collected at the cathode generating a current. As ions are flowing to the cathode, a proportionate number of electrons are flowing to the anode. This current is measured and is used as an indication of the gas density and pressure inside the gauge.
What is the measurement range of the CCM501?
1.00E-09 to 1.00E-02 Torr
1.30E-09 to 1.30E-02 mbar
1.30E-07 to 1.30 Pa
What is the power requirement of the CCM501?
20 to 28 Vdc, 7.2 W. Users can provide their own power supply or use InstruTech’s optional power supply PS501-A.
What are the available output signals from the CCM501?
1 analog output, 1 setpoint relay and RS485 serial communications
At what pressure can I activate the cold cathode sensor?
When the pressure has dropped below 1.00E-02 Torr.
Can I turn on the cold cathode sensor manually?
Yes you can turn on the sensor manually using the front panel push buttons of the CCM501.
Can I activate the cold cathode sensor automatically?
Yes. The cold cathode sensor can be automatically turned on using signals from convection gauges or other sources of digital inputs.
Can the cold cathode sensor be cleaned?
Yes. The cold cathode sensor can be easily disassembled for field cleaning.
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