INDIANA DEPARTMENT OF TRANSPORTATION OFFICE OF MATERIALS MANAGEMENT. VERIFYING THERMOMETERS ITM No T
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1 1.0 SCOPE. INDIANA DEPARTMENT OF TRANSPORTATION OFFICE OF MATERIALS MANAGEMENT VERIFYING THERMOMETERS ITM No T 1.1 This test method covers the procedure for a verification of scale accuracy of liquid-in-glass total and partial immersion thermometers, dial type thermometers, handheld digital thermometers, infrared digital thermometers. 1.2 The values stated in either acceptable English or SI metric units are to be regarded separately as standard, as appropriate for a specification with which this ITM is used. Within the text, SI metric units are shown in parenthesis. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other, without combining values in any way. 1.3 This ITM may involve hazardous materials, operations, and equipment and may not address all of the safety problems associated with the use of the test method. The user of the ITM is responsible for establishing appropriate safety and health practices and determining the applicability of regulatory limitations prior to use. 2.0 REFERENCES. 2.1 ASTM Standards. E 1 Specification for ASTM Thermometers 3.0 TERMINOLOGY. Definitions for terms and abbreviations shall be in accordance with the Department's Standard Specifications, Section APPARATUS. 4.1 Certified thermometer, National Institute of Standards and Technology (NIST) traceable, and of equal or better precision than the thermometer being verified. 4.2 Water/oil bath, capable of maintaining a constant temperature for the time sufficient for verification. 5.0 SIGNIFICANCE AND USE. This ITM is used by laboratory personnel to verify the scale accuracy of liquid-in-glass total and partial immersion thermometers, dial type thermometers, and handheld digital thermometers. 1 of 7
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3 6.0 PROCEDURE. 6.1 Liquid-in-Glass Total and Partial Immersion Thermometers Record the manufacturer, serial number, type, model number, graduation, and date of calibration for the certified thermometer Record the manufacturer, serial number, type, model number, and graduation of the thermometer being verified Visually inspect the shaft of the thermometer being verified for air bubbles, separation of the liquid, foreign matter, glass faults, or any other apparent defects Immerse the thermometer being verified into a water/oil bath to the indicated immersion line for partial immersion thermometers or to the point being verified for total immersion thermometers. A water bath is used for verifications less than 200 F (95 C), and an oil bath is used for verifications equal to or greater than 200 F (95 C) Immerse the certified thermometer into the bath as specified in Allow the readings on both thermometers to stabilize, and record the temperatures of the thermometers 6.2 Dial Type Thermometers Record the manufacturer, serial number, type, model number, graduation, and date of calibration for the certified thermometer Record the manufacturer, serial number, type, model number, and graduation of the thermometer being verified Immerse the dial thermometer into a container of boiling water to a depth of approximately one-half of the depth of the container Immerse the certified thermometer into the container as specified in Allow the readings on both thermometers to stabilize and record the temperatures of the thermometers 2 of 7
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5 6.3 Handheld Digital Thermometer Record the manufacturer, serial number, type, model number, graduation, and date of calibration for the certified thermometer Record the manufacturer, serial number, type, model number, and graduation of the thermometer being verified Immerse the thermocouple assembly into a container of boiling water to a depth of approximately one-half of the depth of the container Immerse the certified thermometer into the container as specified in Allow the readings on both thermometers to stabilize and record the temperature of the thermometers 6.4 Infrared Digital Thermometer Record the manufacturer, serial number, type, model number, graduation, and date of calibration for the certified thermometer Record the manufacturer, serial number, type, model number, and graduation of the thermometer being verified Immerse the certified thermometer into a 1000 ml glass beaker of boiling water to a depth of approximately one-half of the depth of the container and allow the thermometer to stabilize. Record the temperature of the thermometer Hold the infrared digital thermometer approximately 3 in. (75 mm) from the top of the boiling water and point the thermometer to the center of the beaker. Record the temperature of the thermometer Repeat to obtain nine additional temperature readings. After each reading, allow the infrared digital thermometer to recycle to an off setting before obtaining the next reading Calculate the average of the 10 temperature readings and record the average. 3 of 7
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7 7.0 TOLERANCES. 7.1 Thermometers not indicating the same reading as the certified thermometer may be used if the difference in the readings is within the tolerances of 7.2, 7.3, 7.4, and 7.5 for the type of thermometer verified. The difference in readings shall be visibly noted on the thermometer and the difference applied during use is visibly noted and the offset is applied during use. Thermometers not within the tolerances of 7.2, 7.3, 7.4, and 7.5 shall not be used. 7.2 Liquid-in-glass thermometers shall agree with the certified thermometer to within the scale error of Table Dial type thermometers shall be within 5.0 F (2.5 C). 7.4 Handheld digital thermometers shall be within 2 F (1 C). 7.5 Infrared digital thermometers shall be within 4 F (2 C). 8.0 REPORT. The verification of scale accuracy is reported on the form in Appendix A. 4 of 7
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9 Celsius Range Error Fahrenheit Range Error Celsius Range Error Fahrenheit Range Error Graduated in C Graduated in C Graduated in F 18.9 to to to to to Graduated in C Graduated in F 20 to to to to to to to to Graduated in C Graduated in F 38 to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to To to to to Graduated in C Graduated in F 48.6 to to to to to to to to to to to to to to to to to to to to to to to to to to to Graduated in C Graduated in F 20 to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to TABLE 1 5 of 7
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11 Celsius Range Fahrenheit Fahrenheit Error Error Celsius Range Error Error Range Range Graduated in C Graduated in F Graduated in 1 0 C Graduated in 2 0 F 245 to to +20 B -112 to +70 C 123 to to to to to to to to to to to to to to to 400 D 20 to 760 E 148 to to +300 F 30 to 580 G 320 to to +400 H 30 to 760 I 170 to 250 A 10 to to to to to to to to to to to to to to to to to to Graduated in 2 0 C Graduated in 5 0 F Graduated in C Graduated in 1 0 F -6 to +400 J 20 to 760 K -80 to to 370 L 200 to 700 M -37 to to A C to C; C above C -34 to to B 1 0 C to C; 2 0 C below C -20 to to C 2 0 F to F; 4 0 F below F -18 to to D 1 0 C to C; C to C -18 to to E 2 0 F to F; 3 0 F above F -7 to to F C to C; 1 0 C above C -5 to to G 1 0 F to F; 2 0 F above F -1 to to H 1 0 C to C; C above C 60 to I 2 0 F to F; 3 0 F above F 16 to to J 2 0 C to C; 4 0 C above C 75 to K 5 0 F to F; 7 0 F above F 30 to to L 1 0 C to C; 2 0 C above C 95 to M F to F; F above F 147 to to to to to to to to TABLE 1 (cont.) 6 of 7
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13 Appendix A THERMOMETER VERIFICATION ITM 909 CERTIFIED THERMOMETER IDENTIFICATION Manufacturer: Model No.: Type: Date of Calibration: Serial No.: Graduations: VERIFICATION OF THERMOMETER Manufacturer: Model No.: Type: Serial No.: Graduations: Is thermometer free of any apparent defects? (Yes or No) Certified Thermometer Reading Thermometer Being Verified Reading Correction Applied Remarks: Verified by: Date: Next Due Date: A1 of 7
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