Historical
ANSI/ASHRAE Standard 125-1992 (RA 2006)
Method of Testing Thermal Energy Meters for Liquid Streams in HVAC Systems
The test methods, procedures, and facility descriptions in this standard are intended for use in determining measurement accuracy, pressure losses, service flow rate limits, temperature difference limits, and reliability effects of mounting attitude.This standard is limited to applications in which the fluid remains in a completely liquid state while traversing the thermal energy meter. The applications of this standard include, but are not limited to, thermal energy meters used for billing or revenue metering for hydronic applications.This standard does not apply to meters using principles of change-of-state of the fluid, simple elapsed time, or measured in door or outdoor temperature difference to allocate consumption among various end-use customers.
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]
.jpg)