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WO2006004559A1 - Bain d'etalonnage pour l'etalonnage simultane de thermometres medicaux a contact et sans contact - Google Patents

Bain d'etalonnage pour l'etalonnage simultane de thermometres medicaux a contact et sans contact Download PDF

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Publication number
WO2006004559A1
WO2006004559A1 PCT/SI2005/000011 SI2005000011W WO2006004559A1 WO 2006004559 A1 WO2006004559 A1 WO 2006004559A1 SI 2005000011 W SI2005000011 W SI 2005000011W WO 2006004559 A1 WO2006004559 A1 WO 2006004559A1
Authority
WO
WIPO (PCT)
Prior art keywords
thermometers
contact
blackbody
equalising
calibration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SI2005/000011
Other languages
English (en)
Inventor
Igor Pusnik
Jovan Bojkovski
Janko Drnovsek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Univerza V Ljubljani Fakulteta Za Elektrotehniko Laboratorij Za Metrologijo In Kakovost
Univerza Ljubljana v Fakulteta za Farmazijo
Original Assignee
Univerza V Ljubljani Fakulteta Za Elektrotehniko Laboratorij Za Metrologijo In Kakovost
Univerza Ljubljana v Fakulteta za Farmazijo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Univerza V Ljubljani Fakulteta Za Elektrotehniko Laboratorij Za Metrologijo In Kakovost, Univerza Ljubljana v Fakulteta za Farmazijo filed Critical Univerza V Ljubljani Fakulteta Za Elektrotehniko Laboratorij Za Metrologijo In Kakovost
Publication of WO2006004559A1 publication Critical patent/WO2006004559A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/005—Calibration

Definitions

  • the subject of the invention is an ultra-stable and homogeneous bath for simultaneous calibration of non-contact and contact thermometers for the use in medicine and healthcare in general.
  • Field of technology, in which the bath is used, is metrology, since it is basically intended for the calibration of non-contact (radiation, infrared, pyrometers) thermometers and calibration of contact thermometers (liquid-in-glass thermometers, thermometers with digital display of temperature, thermistors, platinum resistance thermometers, thermocouples) by comparison to a reference thermometer, which is traceable to a national or an international temperature standard.
  • thermometers which have to be calibrated and their accuracy needs to be verified, are used in medicine. Calibration assures metrological traceability to the basic units of the international system of units SI. The requirement is set in the European directive concerning medical devices (Council directive 93/42/EEC of 14 June 1993 concerning medical devices, Medical Device Directive) and requires conformity of the actual characteristics of medical devices with specifications set by manufacturers. The invented bath follows the European technical directive and thus enables the testing of conformity of medical non-contact and contact thermometers with specifications set by manufacturers. Non-contact and contact thermometers can also be used in veterinary medicine and for other healthcare purposes. An appropriate system is required for the calibration or verification of both types of thermometers.
  • the invented bath has a special design for liquid flow with spilling over, that is from the auxiliary tube 1, in which heaters 3, cooling spiral 4 and stirring shaft with propeller 5 are placed, into one or two main tubes 2.
  • a blackbody 6 and an equalising block 7 - if necessary and if possible according to the available space there can be more than one - can be placed together in the main tube 2 ( Figure 1, Figure 2), but there is also a possibility of placing a blackbody 6 in one main tube 2, while an equalising block 7 is placed in the other main tube 2 ( Figure 3, Figure 4).
  • An equalising block 7 may be replaced with the holder for the contact thermometers 9 ( Figure 9).
  • Longitudinal axes of the main tubes 2 can form an angle from 180° (Figure 3) to 60° ( Figure 4), with regard to the longitudinal axis of the auxiliary tube 1.
  • the traceability of the calibration is assured with one or more built-in reference thermometers 8 or with external reference thermometers, which are traceable to a national or an international temperature standard.
  • the blackbody 6 is used for the calibration of non-contact thermometers.
  • the shapes of blackbodies are recommended in the standards:
  • the blackbody 6 is made of metal with good thermal conductivity, usually of copper.
  • the interior of the blackbody is painted with special paint, which is temperature resistant and has high emissivity (typically around 0,9). Prior to painting, the surface of the interior of the blackbody has to be cleaned from grease and sandblasted to increase the dispersion of light when reflecting and consequently increasing its emissivity.
  • the paint is applied in three layers which are together approximately 0,1 mm thick. The drying process of the last layer has to be performed at an increased temperature (e.g. 100 0 C) in the time scope of at least 24 hours.
  • the blackbody is placed in the auxiliary tube either horizontally ( Figure 1) or vertically ( Figure 2) with regard to the axis of the body.
  • An equalising block 7 ( Figure 8) is used for the calibration of the contact thermometers and increases temperature stability and homogeneity of the bath essentially. It is made of metal with good thermal conductivity (copper, aluminium) and is galvanised to prevent its oxidation.
  • thermometers 9 which enables placing of several thermometers in the calibration bath, can be used instead of an equalising block 7. It is made of stainless steel.
  • variant 1 - Figure 1, variant 2 - Figure 3, variant 3 - Figure 4
  • Example for variant 1 is presented on Figure 1 and Figure 2.
  • Different shapes of blackbody for its building-in to the calibration bath in variants 1, 2, or 3 are presented on Figures 5, 6 and 7.
  • the bath in variant IA contains an auxiliary tube 1, in which heaters 3, the cooling spiral 4 and the stirring shaft with propeller 5 are placed, and one main tube 2, in which a blackbody 6 and equalising blocks 7 are placed. True temperature is determined with a reference thermometer 8. The placement of the blackbody is horizontal with regard to the axis of the body.
  • the only difference in comparison to the variant IA is the placement of the blackbody, which is vertical with regard to the axis of the body.
  • the bath in variant 2 contains an auxiliary tube 1 with heaters 3, the cooling spiral 4 and the stirring shaft with propeller 5 and two main tubes 2.
  • One main tube contains a blackbody 6 and the other main tube 2 contains an equalising block 7.
  • the true temperature is determined with a reference thermometer 8. Longitudinal axes of the main tubes form an angle of 180° with regard to the longitudinal axis of the auxiliary tube.
  • the bath variant 3 contains an auxiliary tube 1, with heaters 3, the cooling spiral 4 and the stirring shaft with propeller 5 and two main tubes 2.
  • One main tube 2 contains a blackbody 6 and the other main tube contains an equalising block 7.
  • the true temperature is determined with a reference thermometer 8.
  • Longitudinal axes of the main tubes form an angle of 60° with regard to the longitudinal axis of the auxiliary tube.
  • Blackbody which is in compliance with the standard EN 12470-5:2003
  • Blackbody 6 which is in compliance with the European standard EN 12470-5:2003, is a cylinder with bottom truncated under 30° angle.
  • the walls of the cylinder should be as thin as possible to enable faster heat transfer from liquid to the surface in the interior of the blackbody.
  • the flange of the blackbody is well isolated from its metal part and is made of material with low coefficient of heat conduction.
  • FIG. 6 blackbody, which is in compliance with the standard ASTM, Designation E 1965 -
  • - 98 is a cone under an angle of approximately 36°.
  • the walls of the cone should be as thin as possible to enable faster heat transfer from liquid to the surface in the interior of the blackbody.
  • the flange of the blackbody is well isolated from its metal part and is made of material with low coefficient of heat conduction.
  • FIG. 7 blackbody, which is in compliance with the draft standard Japanese Industrial Standard JIS
  • Blackbody 6 which is in compliance with the draft Japanese standard JIS, is a cylinder with narrowing at the aperture.
  • the angle between the cylinder's body axis and its wall is approximately 50° at the aperture, and approximately 120° at the bottom.
  • the walls of the cylinder should be as thin as possible to enable faster heat transfer from liquid to the surface in the interior of the blackbody.
  • the flange of the blackbody is well isolated from its metal part and is made of material with low coefficient of heat conduction.
  • Equalising block 7 can have different number of borings with different diameters. The number depends on the diameter of an equalising block and the desired diameters of borings for contact thermometers. The latter have to correspond with the diameters of thermometers, which are placed in the borings when calibrating. It is used for increasing the temperature stability and homogeneity of the bath and hence achieving lower uncertainties in calibration.
  • Holder for contact thermometers 9 has large number of borings with different diameters and is used to place larger number of contact thermometers 8 into the bath.
  • the number of borings depends on the desired diameters of borings for contact thermometers. It is used instead of an equalising block 7, when the uncertainty of calibration bath in calibration is sufficient.
  • the bath will be used to assure the traceability of medical non-contact and contact thermometers in the temperature range from 20 0 C to 90 °C.
  • the traceability will be assured with the calibration with the help of a built-in or an external reference thermometer 8, which is traceable to a national or an international temperature standard.
  • True temperature is determined by reference thermometer 8, based on which the accuracy of calibrated thermometers is determined.
  • the metrological parameters of the bath which are determined with regular periodic bath calibration, also need to be considered.
  • the bath is intended for the use in hospitals, larger healthcare centres, other healthcare institutions and temperature calibration laboratories. All other types of non-contact and contact thermometers can be calibrated in the defined temperature range beside the medical thermometers. Dimensions of the individual elements of the invention can be adjusted based to the specific requirements or needs.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radiation Pyrometers (AREA)

Abstract

L'invention concerne un bain d'étalonnage ultra-stable et homogène destiné à l'étalonnage simultané de thermomètres à contact et sans contact destinés à être utilisés en métrologie, médecine, médecine vétérinaire et à d'autres usages médicaux. Ledit bain offre une réalisation spéciale d'écoulement de liquide ou de circulation de liquide du tube auxiliaire (1) contenant des éléments chauffants (3), la spirale de refroidissement (4) et l'axe d'agitateur présentant une hélice (5) vers un ou deux tubes principaux (2), du liquide refluant dans le tube auxiliaire (1). Le tube principal (2) contient ensemble ou séparément, un corps noir (6) et un bloc d'égalisation (7) dont le nombre peut être supérieur à un, les axes longitudinaux formant relativement à l'axe longitudinal du tube auxiliaire un angle compris entre 180° et 60°. Un dispositif de retenue de thermomètres (9) peut être utilisé à la place du bloc d'égalisation (7) lorsque l'incertitude au niveau de l'étalonnage est satisfaisante. Le corps noir (6) est utilisé pour l'étalonnage de thermomètres à contact et est peint à l'aide d'une peinture, laquelle présente une émissivité élevée et il est placé dans le tube principal horizontalement ou verticalement. Les formes de corps noirs sont recommandées dans des normes. Un bloc d'égalisation (7) est utilisé pour l'étalonnage des thermomètre à contact et augmente la stabilité de la température et l'homogénéité du bain essentiellement. La température réelle est définie par un thermomètre de référence extérieur ou intégré, qui est traçable sur une norme de température internationale ou nationale. Le corps noir (6) et un bloc d'égalisation (7) sont constitués de métal présentant une bonne conductivité thermique. Les dimensions des éléments individuels et par conséquent le bain lui-même peuvent être adaptés aux exigences ou besoins spécifiques.
PCT/SI2005/000011 2004-07-01 2005-04-29 Bain d'etalonnage pour l'etalonnage simultane de thermometres medicaux a contact et sans contact Ceased WO2006004559A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI200400198A SI21628A (sl) 2004-07-01 2004-07-01 Kopel za sočasno umerjanje medicinskih brezkontaktnih in kontaktnih termometrov
SIP-200400198 2004-07-01

Publications (1)

Publication Number Publication Date
WO2006004559A1 true WO2006004559A1 (fr) 2006-01-12

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Application Number Title Priority Date Filing Date
PCT/SI2005/000011 Ceased WO2006004559A1 (fr) 2004-07-01 2005-04-29 Bain d'etalonnage pour l'etalonnage simultane de thermometres medicaux a contact et sans contact

Country Status (2)

Country Link
SI (1) SI21628A (fr)
WO (1) WO2006004559A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2435691A (en) * 2006-03-02 2007-09-05 Nat Inst Of Advanced Ind Scien Low-temperature comparison calibrator for thermometers
WO2017164723A1 (fr) * 2016-03-22 2017-09-28 Kaplun Mucharrafille Margarita Appareil d'étalonnage de thermomètres optiques infrarouges
RU2668351C1 (ru) * 2017-12-29 2018-09-28 Владислав Андреевич Старостин Установка для поверки и/или калибровки погружного многоточечного датчика температуры, размещенного внутри резервуара
CN108716956A (zh) * 2018-06-04 2018-10-30 江琴兰 一种用于水温传感器检测设备的托架
EP4053527A1 (fr) * 2021-02-25 2022-09-07 Rosemount Aerospace Inc. Méthodologie de test pour déterminer la puissance de sortie du thermistor sous une charge thermique définie

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5183337A (en) * 1991-07-08 1993-02-02 Exergen Corporation Thermometer calibration
WO2000040939A1 (fr) * 1999-01-05 2000-07-13 Isothermal Technology Limited Appareil d'etalonnage thermique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5183337A (en) * 1991-07-08 1993-02-02 Exergen Corporation Thermometer calibration
WO2000040939A1 (fr) * 1999-01-05 2000-07-13 Isothermal Technology Limited Appareil d'etalonnage thermique
GB2361536A (en) * 1999-01-05 2001-10-24 Isothermal Technology Ltd Temperature calibration apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DRNOVSEK J ET AL: "AN OPTIMIZED TEMPERATURE CALIBRATION SYSTEM", 1995 IEEE INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONFERENCE. IMTC/95. WALTHAM, MA., APR. 23 - 26, 1995, PROCEEDINGS OF THE INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONFERENCE. (IMTC), NEW YORK, IEEE, US, 23 April 1995 (1995-04-23), pages 402 - 405, XP000534884, ISBN: 0-7803-2616-4 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2435691A (en) * 2006-03-02 2007-09-05 Nat Inst Of Advanced Ind Scien Low-temperature comparison calibrator for thermometers
GB2435691B (en) * 2006-03-02 2011-03-30 Nat Inst Of Advanced Ind Scien Low temperature comparison calibrator for thermometers
WO2017164723A1 (fr) * 2016-03-22 2017-09-28 Kaplun Mucharrafille Margarita Appareil d'étalonnage de thermomètres optiques infrarouges
RU2668351C1 (ru) * 2017-12-29 2018-09-28 Владислав Андреевич Старостин Установка для поверки и/или калибровки погружного многоточечного датчика температуры, размещенного внутри резервуара
CN108716956A (zh) * 2018-06-04 2018-10-30 江琴兰 一种用于水温传感器检测设备的托架
EP4053527A1 (fr) * 2021-02-25 2022-09-07 Rosemount Aerospace Inc. Méthodologie de test pour déterminer la puissance de sortie du thermistor sous une charge thermique définie
US12326372B2 (en) 2021-02-25 2025-06-10 Rosemount Aerospace Inc. Test methodology to determine power ouput of a thermistor under a defined thermal load

Also Published As

Publication number Publication date
SI21628A (sl) 2005-04-30

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