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Safety apparatus for an Atomic Absorption Spectrophotometer Burner
Spectrochimica Acta, Vol. 42A, Pergamon Journals Ltd. Printed
NO. 8, p. 945, 1966 in Great Britain.
NEW
PATENTS
This Section contains abstracts (without graphics) of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH@ can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4568267
4570054
SAFETY APPARATUS FOR AN ATOMIC ABSORPTION SPECTROPHOTOMETER BURNER
OPEN LOOP CONTROL FOR SPECTROPHOTOMETER ATOMIZER FURNACE
Michael W Kendall-Tobias Perkin-Elmer Corporation
assigned
John Chidzey, John Huberts, Cheltenham, Australia assigned to Varian Associates Inc
to The
Heating apparatus particularly for flameless atomization in spectrophotometers includes a variable electrical power source and a resistive heating element. A desired final temperature and the rate of change of the element temperature (ramp rate) is input to a control circuit. A storage means is provided for storing data relating the heating element temperature to the energy input (voltage) to the heating element required to maintain the heating element at a constant temperature. Processing means calculates from the various data the voltage required to be supplied to the element by the power source to change the temperature thereof at the selected ramp rate until it reaches the final temperature. In spectrophotometers the apparatus accurately controls the carbon rod temperature through drying, ashing and atomizing stages.
An automatic gas flow safety device or system is provided for use with an atomic absorption spectrophotometer burner. Generally speaking, a dual function pneumatic and electrical safety device is described which provides for a cut-off of the (acetylene) gas to the burner, upon monitoring an unacceptable air flow or electrical condition, to avert possible flash-backs at the burner. The invention basically comprises a pneumatic and electrical actuated means to control the on/off flow of gas to the burner determinative on the status of the air pressure and electrical power to the system.
For information about PATSEARCH@
Pergamon InfoLine Inc. 1340 Old Chain Bridge Road McLean, Virginia 22101 USA Telephone (703) 442-0900 Telex: 90-1811
Pergamon InfoLine Limited 12 Vandy Street London ECZA 2DE England Telephone (01) 377-4650 Telex: 8814614
945
Pergamon Press Canada Ltd 150 Consumers Road, Suite 104 Willowdale, Ontario Canada M2J lP9 Telephone (416) 497-8337
NO. 8, p. 945, 1966 in Great Britain.
NEW
PATENTS
This Section contains abstracts (without graphics) of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH@ can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4568267
4570054
SAFETY APPARATUS FOR AN ATOMIC ABSORPTION SPECTROPHOTOMETER BURNER
OPEN LOOP CONTROL FOR SPECTROPHOTOMETER ATOMIZER FURNACE
Michael W Kendall-Tobias Perkin-Elmer Corporation
assigned
John Chidzey, John Huberts, Cheltenham, Australia assigned to Varian Associates Inc
to The
Heating apparatus particularly for flameless atomization in spectrophotometers includes a variable electrical power source and a resistive heating element. A desired final temperature and the rate of change of the element temperature (ramp rate) is input to a control circuit. A storage means is provided for storing data relating the heating element temperature to the energy input (voltage) to the heating element required to maintain the heating element at a constant temperature. Processing means calculates from the various data the voltage required to be supplied to the element by the power source to change the temperature thereof at the selected ramp rate until it reaches the final temperature. In spectrophotometers the apparatus accurately controls the carbon rod temperature through drying, ashing and atomizing stages.
An automatic gas flow safety device or system is provided for use with an atomic absorption spectrophotometer burner. Generally speaking, a dual function pneumatic and electrical safety device is described which provides for a cut-off of the (acetylene) gas to the burner, upon monitoring an unacceptable air flow or electrical condition, to avert possible flash-backs at the burner. The invention basically comprises a pneumatic and electrical actuated means to control the on/off flow of gas to the burner determinative on the status of the air pressure and electrical power to the system.
For information about PATSEARCH@
Pergamon InfoLine Inc. 1340 Old Chain Bridge Road McLean, Virginia 22101 USA Telephone (703) 442-0900 Telex: 90-1811
Pergamon InfoLine Limited 12 Vandy Street London ECZA 2DE England Telephone (01) 377-4650 Telex: 8814614
945
Pergamon Press Canada Ltd 150 Consumers Road, Suite 104 Willowdale, Ontario Canada M2J lP9 Telephone (416) 497-8337