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New vacuum gauge calibration unit
VACUUM Important For further
notice information
Manufacturers Manufacturers The Vacuum
New New
to readers on any
and and News
News
others Editor
matter
mentioned
News,
gauge
to submit information for inclusion Pergamon Press Ltd Headington
and calibration
Edwards High Vacuum (part unit for the routine calibration processes.
unit
of BOC Ltd) have introduced a new of vacuum gauges used in industrial
The bench-mounted unit conforms with the draft British Standard Specification reference document BS 74/77468DC, for a calibration system using direct comparison with a master reference gauge. It consists of a vacuum chamber with up to four master reference gauges which have calibrations traceable to the National Physical Laboratory at Teddington. These gauges cover between them the pressure range from atmospheric to 10 -6 torr. Virtually all industrial processes take place within this range and any type or make of gauge operating within these limits can be calibrated on the Edwards unit. The Unit is supplied complete, and only requires connection to outside services. The calibration chamber is connected to a very quiet and efficient pumping group consisting of an Edwards Diffstak integrated diffusion pump, and a direct-drive rotary pump for roughing and backing. Master reference gauges are supplied to customers’ individual requirements. A console houses the master controls and the monitoring itself.
reference and control
gauges and equipment
their electronic for the vacuum
Full system protection is provided by Edwards Monitorr auto control units which work from feedback signals from the vacuum system. Edwards High Vacuum Circle number 30 on Reader Enquiry Service Card
development
in vacuum
furnace
engineering
Torvac Ltd, announce a new development in their furnaces. After research to meet a specific, unusual problem in vacuum furnace work, they have designed and are now producing a vacuum furnace which can be opened to atmosphere at up to 13OOC. The provision of a new type of heating element ensures that the load, which is protected by the vacuum environment all the way up to temperature, can be removed at high temperature for quenching in oil or water. A fast quench is obtained without the complexities of a vacuum/liquid quench furnace. The new technique does result in some surface oxidation but this is minimized because the operations of load extraction and quench can be very quick. Previous designs of molybdenum,
out
and
post
one
of the
reader
in this feature addressed Hill Hall Oxford OX3
to OBW
enquiry
cards
developments
The Edwards Gauge Calibration Unit is designed to enable suppliers to comply with the new standards of quality control, which are increasingly required by commercial, military and government customers.
New
tear
others are invited Vacuum
products
vacuum
in Vacuum
of vacuum furnace graphite, or stainless
normally use heating steel. These cannot
elements be
exposed oxidation 13OOC,
to atmosphere : if elements the oxidation
at high temperatures without severe of these materials were exposed to air at would be catastrophic.
Though designed to meet that their new development furnace processing. Circle
New
digital
a specific problem will solve other
number
Torvac problems
31 on Reader
Enquiry
are confident in vacuum Torvac Service
Ltd card
thermometer
A new series of self-contained instruments which will give a direct digital read-out of temperature-comprensated for non-linearity of any thermocouple-and at the same time will monitor and record on a chart any deviation of temperature about a pre-set point, is being marketed by Ancom Ltd, Cheltenham. Applications are expected to be both as an in-process control instrument, as well as in research or for operational servicing/test work. Obvious fields are in process plant control, metallurgical heat-treatment and foundry ovens and allied processes, refrigeration equipment calibration and servicing, heating and ventilating systems, fuel efficiency research-whenever it is necessary to record or determine the profile of temperature control over a discrete time. In essence the new instrument is the company’s standard digital thermometer with a deviation monitoring circuit added, which in turn feeds signals to a built-in chart recorder. This means that the basic measurement aspect can be calibrated to operate with virtually any known thermocouple and the output *linearized’ to give a direct display of the measured temperature on a digital panel meter, in accordance with Ancom’s normal practice. However, on the monitoring side of the instrument, the company has built in a number of interesting refinements. First, the temperature point about which it is desired to monitor any deviation can be dialled-up very accurately on a vernier type scale, and locked in position. Secondly, the degree of gain (i.e. the ‘enlargement’ of the deviation band) as displayed on the recorder chart, can be pre-selected to one of five ranges, with the chart full scale representing from 10 degrees up to 1 OOOC. In normal use the digital panel meter reads the working temperature, whilst the recorder chart shows any deviation from a chosen set point. However, the chart can be switched out of circuit when required, so that the instrument functions just as an ordinary digital thermometer. Alternatively, with the deviation set point at zero and the gain select-switch at the maximum temperature for the instrument, the recorder follows the process temperature directly and provides a permanent record of readings over a given time span. 73
notice information
Manufacturers Manufacturers The Vacuum
New New
to readers on any
and and News
News
others Editor
matter
mentioned
News,
gauge
to submit information for inclusion Pergamon Press Ltd Headington
and calibration
Edwards High Vacuum (part unit for the routine calibration processes.
unit
of BOC Ltd) have introduced a new of vacuum gauges used in industrial
The bench-mounted unit conforms with the draft British Standard Specification reference document BS 74/77468DC, for a calibration system using direct comparison with a master reference gauge. It consists of a vacuum chamber with up to four master reference gauges which have calibrations traceable to the National Physical Laboratory at Teddington. These gauges cover between them the pressure range from atmospheric to 10 -6 torr. Virtually all industrial processes take place within this range and any type or make of gauge operating within these limits can be calibrated on the Edwards unit. The Unit is supplied complete, and only requires connection to outside services. The calibration chamber is connected to a very quiet and efficient pumping group consisting of an Edwards Diffstak integrated diffusion pump, and a direct-drive rotary pump for roughing and backing. Master reference gauges are supplied to customers’ individual requirements. A console houses the master controls and the monitoring itself.
reference and control
gauges and equipment
their electronic for the vacuum
Full system protection is provided by Edwards Monitorr auto control units which work from feedback signals from the vacuum system. Edwards High Vacuum Circle number 30 on Reader Enquiry Service Card
development
in vacuum
furnace
engineering
Torvac Ltd, announce a new development in their furnaces. After research to meet a specific, unusual problem in vacuum furnace work, they have designed and are now producing a vacuum furnace which can be opened to atmosphere at up to 13OOC. The provision of a new type of heating element ensures that the load, which is protected by the vacuum environment all the way up to temperature, can be removed at high temperature for quenching in oil or water. A fast quench is obtained without the complexities of a vacuum/liquid quench furnace. The new technique does result in some surface oxidation but this is minimized because the operations of load extraction and quench can be very quick. Previous designs of molybdenum,
out
and
post
one
of the
reader
in this feature addressed Hill Hall Oxford OX3
to OBW
enquiry
cards
developments
The Edwards Gauge Calibration Unit is designed to enable suppliers to comply with the new standards of quality control, which are increasingly required by commercial, military and government customers.
New
tear
others are invited Vacuum
products
vacuum
in Vacuum
of vacuum furnace graphite, or stainless
normally use heating steel. These cannot
elements be
exposed oxidation 13OOC,
to atmosphere : if elements the oxidation
at high temperatures without severe of these materials were exposed to air at would be catastrophic.
Though designed to meet that their new development furnace processing. Circle
New
digital
a specific problem will solve other
number
Torvac problems
31 on Reader
Enquiry
are confident in vacuum Torvac Service
Ltd card
thermometer
A new series of self-contained instruments which will give a direct digital read-out of temperature-comprensated for non-linearity of any thermocouple-and at the same time will monitor and record on a chart any deviation of temperature about a pre-set point, is being marketed by Ancom Ltd, Cheltenham. Applications are expected to be both as an in-process control instrument, as well as in research or for operational servicing/test work. Obvious fields are in process plant control, metallurgical heat-treatment and foundry ovens and allied processes, refrigeration equipment calibration and servicing, heating and ventilating systems, fuel efficiency research-whenever it is necessary to record or determine the profile of temperature control over a discrete time. In essence the new instrument is the company’s standard digital thermometer with a deviation monitoring circuit added, which in turn feeds signals to a built-in chart recorder. This means that the basic measurement aspect can be calibrated to operate with virtually any known thermocouple and the output *linearized’ to give a direct display of the measured temperature on a digital panel meter, in accordance with Ancom’s normal practice. However, on the monitoring side of the instrument, the company has built in a number of interesting refinements. First, the temperature point about which it is desired to monitor any deviation can be dialled-up very accurately on a vernier type scale, and locked in position. Secondly, the degree of gain (i.e. the ‘enlargement’ of the deviation band) as displayed on the recorder chart, can be pre-selected to one of five ranges, with the chart full scale representing from 10 degrees up to 1 OOOC. In normal use the digital panel meter reads the working temperature, whilst the recorder chart shows any deviation from a chosen set point. However, the chart can be switched out of circuit when required, so that the instrument functions just as an ordinary digital thermometer. Alternatively, with the deviation set point at zero and the gain select-switch at the maximum temperature for the instrument, the recorder follows the process temperature directly and provides a permanent record of readings over a given time span. 73