Voltage Supply Units.
Voltage Supply Units.
As part of our mass spectrometry systems, we build and design our power supply units and controllers in house. These power supply units that are available as part of our mass spectrometry systems are also available separately for clients looking to design their own systems and buy components for integration by the client.
The Kore TOF-MS Voltage Controller contains modules to address four tasks:
These are the high performance, high stability voltage supplies that are required to perform TOF-MS. The stability of the mass peaks in a TOF-MS is dependent upon the stability of the voltages from the basic supplies to the control unit and out to the instrument, and so we specify high-end supplies, with different current capabilities depending upon the usage.
Where a customer does not require a programmable, general-purpose (transportable) high voltage supply, or where the budget makes constraints, Kore can supply dedicated rack-mounted high performance supply modules. The voltage supply performance is equivalent, but there is no front panel control or external computer control capability. The supplies are dedicated and are therefore less expensive.
If there is only one high voltage supply required, we can fit this into the TOF-MS Voltage Controller, meaning that an instrument can be controlled from a single 3U supply. This would be the case, for instance, in an electron ionisation TOF, where positive ion detection is the only mode, and thus only one polarity (negative voltage) is required throughout the spectrometer.
Where two or more high voltage supplies are required, these are located into a separate, 19″ rack-mounted Kore box.
Although Kore designs and manufactures high voltage power supply unit, there are occasions where a client would prefer to use a third party power supply units. We have previously integrated third party power supplies such as those by Stanford Research Systems (SRS) into our instrumentation, fitting an SRS-approved modification to allow them to be shut off by a signal from a suitable vacuum gauge controller. They can be rack-mounted along with other Kore 19″ units, or can be free-standing. We are happy to accommodate your preferred power supply unit to create your ideal custom instrument.
The TOF-MS Logic Controller is particularly useful when building systems where both simple manual control and computer control is required. There are two modules:
There are a total of eight 9 pin miniature ‘D’ type plugs provided to output polarity and high voltage enable control to other units in the system. Although they each have specific labels and are wired as described below, it is important to realise that the intent of the design is that these can be used for general purposes. Each of the two logical signals, high voltage enable/disable and negative/positive polarity, has been assigned three double pole changeover relays on the internal PCB.
The normally open and normally closed contacts can be easily patched to ground or +5 Volts, or indeed anything else that seems appropriate. External supplies might have a range of conventions for switching polarity or for high voltage enable. For example TTL signal levels, the shorting of a connection to ground or the making of a link. The idea is that any of these conventions can be accommodated by a suitable wiring of one of the sets of relay contacts.
Kore designed this 19″ rack unit as very useful addition to an instrument rack when the instrument is required to have a single emergency off button that will shut power instantly to all the various other instrument modules. The unit also has a mains power failsafe, meaning that on power failure, the unit remains off until switched on manually. The mains distribution unit can also be fitted with a bakeout timer and supply, and this is seen below in the front panel graphic of the unit.
We have also customised this unit, for instance to close the backing line valves of a diffusion pump system in the event of power failure, to prevent unintentional venting. This unit has front panel, manual ‘on’ switches for re- opening these valves. This is an example of the customisation that Kore is willing and able to do to provide the correct functionality for an instrument.
Kore Technology is a centre of excellence in time-of-flight mass spectrometer technology and has a very strong R&D capability in terms of its personnel, all of whom have been heavily involved in a variety of analytical instrumentation development programmes.