Summary: The article expresses the research experience of flow transducer to quantity of heat according to the author, detailed the main problem that when analysing watch of small-bore mechanical hot water to express flow transducer as quantity of heat, exists, be like: Span problem, problem of difference of capacity coefficient of cold hot water, reduce only then move discharge and raise question of the precision below little flow condition, magnetism passes the magnetism that means exists to disturb a problem, miss pace issue, and the adaptability problem to water quality of our country heating room system. Article basis studies and the analysis puts forward delibrate of the person of the same trade inside a few preliminary solutions and course of study to afore-mentioned problems as a result, with period the development level that raises list of our country quantity of heat.

Keyword: Quantity of heat expresses discharge limits capacity coefficient to amend the interference that fight magnetism to get used to water quality.

Summarize: Be in domestic and international numerous door in expressing a product with quantity of heat, wait for a lot of element because of the price and power comsumption, use small-bore mechanical hot water generally to express the flow transducer that expresses as quantity of heat, the to flowmeter part requirement in building ministry quantity of heat to express occupation standard CJ128-2000 basically also adopted as identical as function of product of active hot water meter requirement.
Use and study practice to make clear: Use small-bore mechanical hot water to express the flow transducer that expresses as quantity of heat directly, put in the problem that a series of need solve. The basis expresses the research experience of flow transducer to quantity of heat, the main problem that when we discover small-bore mechanical heats up water meter to express flow transducer as quantity of heat, exists has: Span problem, problem of difference of capacity coefficient of cold hot water, reduce only then move discharge and raise question of the precision below little flow condition, magnetism passes the magnetism that means exists to disturb a problem, high temperature misses pace issue, and the adaptability problem to water quality of our country heating room system. According to consider and analysing a result we made preliminary analysis to afore-mentioned problems, put forward delibrate of the person of the same trade inside a few solutions and course of study, with period the flow transducer that development went watch of quantity of heat to suit, raise the development level that our country quantity of heat expresses jointly.

1 quantity of heat expresses the span issue of flow transducer

The measurement of flow transducer of watch of 1.1 quantity of heat limits

Construction ministry quantity of heat expresses the 4.3.3rd regulation in occupation standard CJ128-2000: "The commonly used discharge that quantity of heat expresses should accord with the requirement of water meter of GB/778.3 cold water, of commonly used discharge and the least flow it is than answering 10, 25, 50 or 100. The quantity of heat of 40mm of nominal diameter ≤ is expressed, its are commonly used of discharge and the least flow than must be being used 50 or 100. Its are commonly used of discharge and the least flow than must be being used 50 or 100..
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