Instruments & Measurements
ASHRAE Technical Committee 1.2

Scope of TC 1.2

ASHRAE TC 1.2 Instruments and Measurements is concerned with the principles of instrumentation and the concepts and techniques of basic measurements, especially for processes and properties associated with air conditioning, heating, refrigeration, and related areas of environmental engineering.


The ASHRAE Handbook is published in a series of four volumes, one of which is revised each year, ensuring that no volume is older than four years.

Fundamentals: Measurement and Instruments
HVAC engineers and technicians require instruments for both laboratory work and fieldwork. Precision is more essential in the laboratory, where research and development are undertaken, than in the field, where acceptance and adjustment tests are conducted. This chapter describes the characteristics and uses of some of these instruments.

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Technical committees develop and sponsor technical sessions at the winter and annual conferences. Information about their future technical program is discussed at each TC meeting and at the TC's Program Subcommittee meeting

ASHRAE publishes papers and transactions from presentations at its conference events. In addition, ASHRAE records most of the seminar sessions from its conferences on DVD. These DVDs are ideal for use at chapter meetings, in university courses, or company lunch and learns. Products available from the most recent conference may be found here.

Our programs subcommittee chair is Steve Idem.


Technical Committees are responsible for identifying research topics, proposing research projects, selecting bidders, and monitoring research projects funded by ASHRAE. Information about their specific research program is discussed at each TC meeting and at the TC's Research Subcommittee meeting.

Research projects that go through TC 1.2 are related to more fundamental forms of research.

Presently, we have one research project RP 1245, "Determine the Effect of Duct Fittings on Air Flow Traverses." This project is co-sponsored by TC 7.7 Testing & Balancing. This project has been completed and final reports are being delivered to ASHRAE. The project is being conducted by Kansas State University.


ASHRAE writes standards for the purpose of establishing consensus for: 1) methods of test for use in commerce and 2) performance criteria for use as facilitators with which to guide the industry. ASHRAE publishes the following three types of voluntary consensus standards: Method of Measurement or Test (MOT), Standard Design and Standard Practice. ASHRAE does not write rating standards unless a suitable rating standard will not otherwise be available. ASHRAE is accredited by the American National Standards Institute (ANSI) and follows ANSI's requirements for due process and standards development. Standards may be purchased at the ASHRAE Bookstore.

TC 1.2 Instruments and Measurements is very active in Fundamental Standards such as those found in the 41 series of ASHRAE Standards. The 41 series of Standards are governed by SSPC 41. There are a number of sub-committees with SSPC 41 which oversee the development and revision of all of the 41.X Standards.  TC 1.2 is cognizant for the following standards (TC 1.1 and TC8.1 are co-cognizant) and guideline:

STD 41.1: Standard Methods for Temperature Measurement
STD 41.2: Standard Methods for Air Velocity and Airflow Measurement
STD 41.3: Standard Methods for Pressure Measurement
STD 41.4: Standard Methods for the Proportion of Lubricant on Liquid Refrigerant Measurement
STD 41.6: Standard Method for Measurement of Moist Air Properties
STD 41.7: Method of Test for Measurement of Flow of Gas
STD 41.8: Standard Methods of Measurement of Flow of Liquids in Pipes Using Orifice Flowmeters
STD 41.9: Standard Methods for Volatile-Refrigerant Massflow Measurements Using Calorimeters
STD 41.10: Standard Methods for Volatile Refrigerant Massflow Measurement Using Flowmeters
STD 41.11: Standard Methods for Power Measurement
GDL 2: Engineering Analysis of Experimental Data


ASHRAE Technical FAQs are provided as a service to ASHRAE members, users of ASHRAE publications, and the general public. While every effort has been made to ensure their accuracy and reliability, they are advisory and provided for informational purposes only, and in many cases represent only one person’s view. They are not intended and should not e relied on as an official statement of ASHRAE. Technical questions not addressed may be submitted to the ASHRAE Technical Services department at

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