Dkd r 5 1 e Resistance Thermometers | Thermometer | Calibration

Please download to get full document.

View again

of 24
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Information Report
Category:

Documents

Published:

Views: 274 | Pages: 24

Extension: PDF | Download: 7

Share
Related documents
Description
DKD Guidelines are application documents to the requirements of DIN EN ISO/IEC 17025:2005. DKD Guidelines describe technical and organizational processes serving the calibration laboratories as examples when laying down internal procedures and regulations. DKD Guidelines can become integral parts of the quality management documentation of calibration laboratories. By application of the Guidelines equal treatment of the devices to be calibrated at the various calibration laboratories is supported and the continuity and verifiability of the work of the calibration laboratories is enhanced.
Tags
Transcript
  Edition 10/2003 ♦  English translation 02/2009 Page 1 of 24 DEUTSCHER KALIBRIERDIENST Guideline DKD-R 5-1   Calibration of Resistance Thermometers   http://www.dkd.eu/dokumente/Richtlinien/dkd_r_5_1_e.pdf  DKD-R 5-1 ♦  Calibration of Resistance Thermometers Edition 10/2003 ♦  English translation 02/2009 Page 2 of 24 Published by the Accreditation Body of the Deutscher Kalibrierdienst (DKD) in cooperation with its Technical Committee “Temperature and Humidity”. Copyright © 2003 by DKD English translation 02/2009 The document and all its parts are protected by copyright. Any unauthorized use outside the narrow limits set by the Copyright Act is inadmissible and liable to prosecution. This applies in particular to copies, translations, microfilming and storage and processing in electronic systems. Deutscher Kalibrierdienst (DKD)  The DKD consists of the Accreditation Body and independent calibration laboratories of in-dustrial enterprises, research institutes, technical authorities, inspection and testing institutes. The laboratories are accredited and supervised by the Accreditation Body. They calibrate measuring instruments and material measures within the scope of accreditation. The DKD calibration certificates issued by them prove traceability to national standards as required in the ISO 9000 family and ISO/IEC 17025. Calibrations carried out by DKD laboratories ensure that the user can rely on measurement results, increase the customers' confidence and competitiveness on the national and interna-tional markets and serve as a metrological basis for the inspection of measuring and test equipment within the framework of quality assurance measures. Publications : see Internet Address: Deutscher Kalibrierdienst Akkreditierungsstelle Bundesallee 100, 38116 Braunschweig POB 33 45, 38023 Braunschweig Germany Telephone (office): + 49 05 31 5 92-19 01 Fax: + 49 05 31 5 92-19 05 Email: info@dkd.eu Internet: www.dkd.eu  DKD-R 5-1 ♦  Calibration of Resistance Thermometers Edition 10/2003 ♦  English translation 02/2009 Page 3 of 24 Contents Contents......................................................................................................................................3 Preface .......................................................................................................................................4 1 Scope..............................................................................................................................4 2 Introduction....................................................................................................................5 3 Resistance thermometers................................................................................................5 3.1 Metal resistance thermometers.......................................................................................5 3.1.1 Standard platinum resistance thermometers (SPRT)......................................................5 3.1.2 Industrial platinum resistance thermometers (IPRT)......................................................6 3.2 Semiconductor resistance thermometers........................................................................6 4 Fundamentals of the calibration of resistance thermometers.........................................6 5 Transport and initial inspection......................................................................................7 6 Aging test........................................................................................................................7 7 Thermostat......................................................................................................................8 8 Influencing factors..........................................................................................................8 8.1 Thermal load...................................................................................................................8 8.2 Thermal coupling............................................................................................................9 8.3 Electrical measurement procedures................................................................................9 8.4 Connection systems........................................................................................................9 8.4.1 Two-wire connection system..........................................................................................9 8.4.2 Three-wire connection system......................................................................................10 8.4.3 Four-wire connection system........................................................................................10 8.4.4 Parasitic thermovoltage................................................................................................11 8.4.5 Self-heating...................................................................................................................11 8.4.6 Insulation resistance.....................................................................................................11 8.4.7 Asymmetry deviation...................................................................................................11 8.4.8 Hysteresis......................................................................................................................12 9 Recalibration.................................................................................................................12 10 Results..........................................................................................................................13 Annex A: Measurement uncertainty in the calibration of thermometers by the comparison method.......................................................................................................14 Annex B: Uncertainty in measurements using a resistance thermometer................................24  DKD-R 5-1 ♦  Calibration of Resistance Thermometers Edition 10/2003 ♦  English translation 02/2009 Page 4 of 24 Preface DKD Guidelines are application documents to the requirements of DIN EN ISO/IEC 17025:2005. DKD Guidelines describe technical and organizational processes serving the calibration laboratories as examples when laying down internal procedures and regulations. DKD Guidelines can become integral parts of the quality management documentation of cali- bration laboratories. By application of the Guidelines equal treatment of the devices to be cali- brated at the various calibration laboratories is supported and the continuity and verifiability of the work of the calibration laboratories is enhanced. The DKD Guidelines should not impede the further development of calibration procedures and sequences. Deviations from the Guidelines and new procedures are admissible in agree-ment with the Accreditation Body should this be advisable for technical reasons. The Guideline was prepared by the Technical Committee Temperature and Humidity in cooperation with the PTB and adopted by the Advisory Board of the DKD. With its publica-tion it will become binding for all DKD calibration laboratories unless these have compiled separate procedural instructions which have been approved by the Accreditation Body. This DKD Calibration Guideline replaces the previous DKD Calibration Guidelines DKD-R 5-1 (1992) and DKD-R 5-2 (1992). This document is a translation of the German Guideline DKD-R 5-1, Ausgabe 10/2003. In case of any disputes the respective German version will be binding. 1   Scope This Guideline was prepared to fulfil the need for a guide in the form of a general document dealing with the calibration of resistance thermometers. It applies above all to platinum resis-tance thermometers complying with the requirements of the standard DIN EN 60751 and cov-ering the temperature range from  ─  200 °C to 850 °C. It is also valid for all categories of resistance thermometers among which the following are of  particular importance: ã   resistance thermometers from spectrally pure platinum meeting the requirements of the ITS-90 (temperature range  ─  259 °C to 962 °C) ã   nickel resistance thermometers ã   copper resistance thermometers ã   semiconductor resistance thermometers (thermistors, NTCs, PTCs) Furthermore, the Guideline is applicable to: ã   direct-indicating electrical thermometers with resistance sensor ã   resistance thermometers with measuring transducer, the output signal of the latter be-ing either analog or digital standardized signals ã   data loggers with an electrical resistance thermometer as sensor
Recommended
R 5 0160 E-EN

R 5 0160 E-EN

28 pages

View more...
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks