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New from Chell Instruments
Vacuum News with their predecessors, and offer large improvements in both o,Jtgassing rate and run time, so that continuous running at uhv can be achieved, even with the smallest motors. The windings have been optimized to improve efficiency and are more closely coupled to the stator. The metal surfaces are coated with a diamond-like carbon film which has increased the emissivity. The coating reduces the surface temperature and also inhibits outgassing at all temperatures. Refinements to insulating materials have resulted in only hydrogen and c;~rbon monoxide being identifiable in the outgassing spectra. Changes to other materials and components have also been made, ircluding the use of hybrid ceramic ball bearings; this has made them u,;able at low temperatures and adaptable for use in high-radiation environments. The motors may be baked at up to 200°C and they ircorporate a K thermocouple in the stator for control of baking and
for thermal management while running. Motors, accessories and purpose-designed drives are available from stock. A range of standard and custom mechanisms are manufactured to order. Further information from: Arun Microelectronics Ltd Fitzalan Road Arundel West Sussex BN18 9JP, UK Tel (44) 903 884141 Fax (44) 903 884411 9
New from
Chell Instruments
N e w r a n g e of a b s o l u t e pressure t r a n s d u c e r s . MKS Instruments has introduced its new 600 range of general purpose and temperature controlled Baratron absolute pressure transducers. With several advanced sensor, electronics and robust packaging features they have full scale ranges as low as 0.1 mmHg, with error down to 0.12% of reading. Long term calibration stability has been substantially improved and overpressure capability increased to 45 psia. Reliability has been designed-in, using surface mount components and ASICs and verified with extensive MTBF analysis and STRIFE (stressed life) testing. There is a two year warranty on all the new 600 series Baratrons. Further information from: non Mitchell Chell Instruments Ltd Tudor House Grammar School Road North Walsham Norfolk NR28 9JH, UK Tel 0692 402488 Fax 0692 406177
Commercial news News from
Edwards
Vacuum gauge c o n t r o l l e r w i t h t r i p l e d i s p l a y . The Active TM gauge controller (AGC), introduced recently by Edwards High Vacuum International, is now available in a version with a triple line display showing the pressure at three gauge heads simultaneously. The controllers will drive three or six gauge heads of any type, including Pirani, thermocouple, inverted magnetron and ionisation, in any combination. There is also a model for use with capacitance manometers. A~ each Edwards Active gauge head has a unique type identification, reconfiguration of the controllers is as simple as unplugging one head and plugging in another. This automatically identifies which type of gauge is in use and rescales accordingly. The unit's six built-in solid st,ate switches, rated at 40 V dc 100 mA, can be set using a simple menu system. The switches are then under the control of any of the gauge heads, using high and low pressure setpoints. There is also a choice of an internal card with six changeover relays rated at 240 V ac 3 A or an external DIN rail mounted module with six 240 V ac 5 A relays.
M a g n e t i c l e v i t a t i o n f o r v i b r a t i o n - f r e e v a c u u m . With the very high magnifications encountered in scanning electron microscropy comes the requirement for vibration-free operation. The National University of Singapore has installed a magnetically levitated Seiko Seiki STP300 turbomolecular pump, supplied by Edwards, for vacuum duty on a high resolution nuclear microscope. Having developed a nuclear microscope for Oxford University, Dr Frank Watt and his team of experts were asked to set up a similar facility in collaboration with Professor Tang of the National University of Singapore (N US) Physics Department. Nuclear microscopes use a technique called Particle Induced X-ray Emission (PIXE) to identify chemical elements in extremely small specimens. The technique entails accelerating a focused beam of very fast protons at the specimen under examination. As the protons bombard the 637
for thermal management while running. Motors, accessories and purpose-designed drives are available from stock. A range of standard and custom mechanisms are manufactured to order. Further information from: Arun Microelectronics Ltd Fitzalan Road Arundel West Sussex BN18 9JP, UK Tel (44) 903 884141 Fax (44) 903 884411 9
New from
Chell Instruments
N e w r a n g e of a b s o l u t e pressure t r a n s d u c e r s . MKS Instruments has introduced its new 600 range of general purpose and temperature controlled Baratron absolute pressure transducers. With several advanced sensor, electronics and robust packaging features they have full scale ranges as low as 0.1 mmHg, with error down to 0.12% of reading. Long term calibration stability has been substantially improved and overpressure capability increased to 45 psia. Reliability has been designed-in, using surface mount components and ASICs and verified with extensive MTBF analysis and STRIFE (stressed life) testing. There is a two year warranty on all the new 600 series Baratrons. Further information from: non Mitchell Chell Instruments Ltd Tudor House Grammar School Road North Walsham Norfolk NR28 9JH, UK Tel 0692 402488 Fax 0692 406177
Commercial news News from
Edwards
Vacuum gauge c o n t r o l l e r w i t h t r i p l e d i s p l a y . The Active TM gauge controller (AGC), introduced recently by Edwards High Vacuum International, is now available in a version with a triple line display showing the pressure at three gauge heads simultaneously. The controllers will drive three or six gauge heads of any type, including Pirani, thermocouple, inverted magnetron and ionisation, in any combination. There is also a model for use with capacitance manometers. A~ each Edwards Active gauge head has a unique type identification, reconfiguration of the controllers is as simple as unplugging one head and plugging in another. This automatically identifies which type of gauge is in use and rescales accordingly. The unit's six built-in solid st,ate switches, rated at 40 V dc 100 mA, can be set using a simple menu system. The switches are then under the control of any of the gauge heads, using high and low pressure setpoints. There is also a choice of an internal card with six changeover relays rated at 240 V ac 3 A or an external DIN rail mounted module with six 240 V ac 5 A relays.
M a g n e t i c l e v i t a t i o n f o r v i b r a t i o n - f r e e v a c u u m . With the very high magnifications encountered in scanning electron microscropy comes the requirement for vibration-free operation. The National University of Singapore has installed a magnetically levitated Seiko Seiki STP300 turbomolecular pump, supplied by Edwards, for vacuum duty on a high resolution nuclear microscope. Having developed a nuclear microscope for Oxford University, Dr Frank Watt and his team of experts were asked to set up a similar facility in collaboration with Professor Tang of the National University of Singapore (N US) Physics Department. Nuclear microscopes use a technique called Particle Induced X-ray Emission (PIXE) to identify chemical elements in extremely small specimens. The technique entails accelerating a focused beam of very fast protons at the specimen under examination. As the protons bombard the 637