Thermometry and Hygrometry Standards Section

Overview

Capabilities

The Thermometry and Hygrometry Standards Section (THSS) maintains Standard Platinum Resistance Thermometers and Type R Thermocouples for temperature measurements and Two-Pressure Humidity Generator for humidity measurements as reference standards. The THSS calibrates liquid-in-glass thermometers, digital thermometers, industrial platinum resistance thermometers, psychrometers, wall thermometers, refrigerator thermometers and bi-metal thermometers from -30°C to 250°C. In October 2010, the Thermometry (LIGT, DT and IPRT) Standards Section of NML was granted accreditation by the Deutsche Akkreditierungsstelle GmbH (German Accreditation Body, DAkkS) to perform calibrations in accordance with the standard DIN EN ISO/IEC 17025 for the scope liquid-in-glass thermometers, digital thermometers and industrial platinum resistance thermometers from -30 °C to 250 °C. DAkkS accreditation is applied for the measurands/calibration items listed below:

Measurand/ Calibration Item	Measurement Range	Calibration and Measurement Capabilities (CMC)
By Comparison Method in a Liquid Bath
Liquid-in-Glass Thermometer (LIGT)	- 30°C to 0°C 0°C to 90°C 90°C to 250°C	45 mK 45 mK 45 mK
Digital Thermometer (DT)	- 30°C to 0°C 0°C to 90°C 90°C to 250°C	30 mK 30 mK 30 mK
Industrial Platinum Resistance Thermometer (IPRT)	- 30°C to 0°C 0°C to 90°C 90°C to 250°C 0°C (Ice Point)	25 mK 25 mK 30 mK 10 mK

Measurand/

Calibration Item

Measurement

Range

Calibration and Measurement Capabilities (CMC)

By Comparison Method

in a Liquid Bath

Liquid-in-Glass

Thermometer

(LIGT)

- 30°C to 0°C

0°C to 90°C

90°C to 250°C

45 mK

Digital

Thermometer

(DT)

- 30°C to 0°C

0°C to 90°C

90°C to 250°C

30 mK

Industrial Platinum

Resistance Thermometer (IPRT)

- 30°C to 0°C

0°C to 90°C

90°C to 250°C

0°C (Ice Point)

25 mK

30 mK

10 mK

Standards and Equipment The Thermometry (LIGT, DT, and IPRT) Standards Section of NML maintains two reference standard SPRTs (Standard Platinum Resistance Thermometer) that are traceable to SI through KRISS, Korea. These SPRTs are used to calibrate two working standard IPRTs (Industrial Platinum Resistance Thermometer) to provide traceability to SI to measurements done in the country. SPRTs may also be used as reference standard for the calibration of thermometers from customers depending on the uncertainty requirement.

Reference Standard: Standard Platinum Resistance Thermometer (SPRT)

Working Standard: Industrial Platinum Resistance Thermometer (IPRT)

Temperature Equipments

INTERNATIONAL INTERCOMPARISON:

Participant: APMP T-S6 Intercomparison of Industrial Platinum Resistance Thermometer (IPRT) Calibration Intercomparison from -30 °C to 300 °C. Awaiting Final Report from Pilot Laboratory, SIRIM-MALAYSIA. Pilot Laboratory: APMP TCT/DEC APMP.T-S8 Liquid-in-Glass Thermometer Calibration Intercomparison. Ongoing. Organizer and Host: APMP TCT/DEC APMP TCT/DEC APMP.T-S8 Preparatory Workshop for Liquid-in-Glass Thermometer (LIGT) Calibration Intercomparison held at the National Metrology Laboratory-Philippines held last February 2011.

LOCAL INTERCOMPARISON

Organizer and Pilot Laboratory: Proficiency Testing Program: No. 07-2010-PTILC-0128 Digital Thermometer Calibration Intercomparison from 0°C to 250°C with Pt100 x 0.1°C resolution

Staff

MONALISA G. RAGAY-ENOT - Section Head
JES ANDRE G. TRILLANA
FREDERICK BUENO
JOHN MARK T. TOLENTINO

Traceability

Traceability

Services

Services Offered

Equipment Calibrated at the Thermometry (LIGT, DT and IPRT) Standards Section of NML: Liquid-in-Glass Thermometers, Digital Thermometers, Industrial Platinum Resistance Thermometers, Wall Thermometer, Refrigerator Thermometer, Bi-Metal Thermometer and Psychrometer.

CALIBRATION BY COMPARISON METHOD of Liquid-in-Glass Thermometer, Digital Thermometer, Industrial Platinum Resistance Thermometer, Wall Thermometer, Refrigerator Thermometer, Bi-Metal Thermometer and Psychrometer.

CALIBRATION METHOD: Comparison of the temperature indicated by the Liquid-in-Glass Thermometer, Digital Thermometer, Industrial Platinum Resistance Thermometer, Wall Thermometer, Refrigerator Thermometer, Bi-Metal Thermometer and Psychrometer with the temperature indicated by the working standard Industrial Platinum Resistance Thermometer in a stirred liquid bath. Ice Point temperature is also measured before and after calibration. CAPABILITY: -30°C to 250°C

Equipment Calibrated at the Thermometry (LIGT, DT and IPRT) Standards Section of NML: Industrial Platinum Resistance Thermometer (IPRT) and Standard Platinum Resistance Thermometer (SPRT)

CALIBRATION BY COMPARISON METHOD of Industrial Platinum Resistance Thermometer (IPRT) and Standard Platinum Resistance Thermometer (SPRT)

CALIBRATION METHOD: The Industrial Platinum Resistance Thermometer (IPRT) is calibrated by comparison with a Standard Platinum Resistance Thermometer (SPRT) in a stirred liquid bath . The IPRT is annealed before calibration; the resistance of the IPRT is measured at ice point before and after annealing, and before and after calibration. CAPABILITY: -30°C to 250°C

CALIBRATION BY COMPARISON METHOD of Industrial Platinum Resistance Thermometer (IPRT) and Standard Platinum Resistance Thermometer (SPRT)

CALIBRATION METHOD: The Industrial Platinum Resistance Thermometer (IPRT) is calibrated by comparison with a Standard Platinum Resistance Thermometer (SPRT) in a stirred liquid bath . The IPRT is annealed before calibration; the resistance of the IPRT is measured at ice point before and after annealing, and before and after calibration. CAPABILITY: -30°C to 250°C

Accreditation

The Temperature Standards Section of the National Metrology Laboratory of the Philippines is competent under the terms of ISO/IEC 17O25:2OO5 to carry out calibration of temperature standards.

Scope of Accreditation

Download Accreditation Certificate and Annexes

CMCs

Calibration and Measurement Capabilities (CMCs)