1.1 This guide is intended for use with dry-block temperature calibrators without the use of fluids or thermal, contact-enhancing, media over a range of -45 to 1200C. 1.2 In this guide, the essential features of dry-block calibrators used for the purpose of thermometer calibration in either the direct or indirect comparison modes are described. The direct mode is defined as using the dry-block calibrator as a standalone instrument with the control sensor and the calibrator display serving as the reference while the indirect mode uses an external sensor and ancillary measurement system as the reference. 1.3 Measurement practices to optimize the accuracy of a dry block calibrator to obtain optimum results are proposed in this guide. 1.4 Tests that can be performed to define uncertainty limits and how they may be used in creating an uncertainty budgets are proposed in this guide. 1.7 Dry-block calibrator accessories such as built-in reference thermometers, switch testing circuitry, computer communications, or current loops will not be discussed. 1.8 Units-The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.
Dry-well calibrators are increasingly used in traceable temperature measurement. Euramet has produced a good document pertaining to calibration of dry-well calibrators; however, the guide does not directly address use of dry-well calibrators. As a result, direct application of the Euramet guide in evaluating the uncertainties associated with use will result in an overestimate of uncertainties. Additionally, no formal guidance pertaining to usage is available.
Keywordsdry-block temperature calibrator; thermometer calibration
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development