请注意:此版本的所有临时修订版将在您购买时提供。这些要求包括用于消防信号系统的叶片式水流指示器，该系统将在以下情况下用于普通室内位置: 符合国家火灾报警规范NFPA 72。 1.1 2000年7月26日修订的这些要求涵盖的水流指示器包括3/4英寸及以上的尺寸。指示器尺寸指的是主喷头的标称内径 安装它们的管道。叶片式水流指示器是一种具有电触点的机构总成，当叶片， 位于自动喷水灭火系统的供水管（立管）中，通过管道中的水流移动。这种流动通常是由一个或多个阀门的开启引起的 火灾导致的洒水喷头。信号触点拟连接至专用消防信号系统的电路。这些要求不包括压力操作水流指示器。包含新特性、特性、组件、材料或系统的产品，或与本标准要求涵盖的产品不同的产品，以及 涉及火灾、触电或人身伤害风险的，应使用适当的附加组件和最终产品要求进行评估，以 保持本标准意图最初预期的安全水平。特性、特性、组件、材料或系统发生冲突的产品 本标准的具体要求或规定不符合本标准。要求的修订应以一致的方式提出和采用 制定、修订和实施本标准所采用的方法。

Please note: All interim revisions for this edition available at time of your purchase will be included.These requirements cover vane type waterflow indicators intended for use in fire protective signaling systems to be employed in ordinary indoor locations, in accordance with the National Fire Alarm Code, NFPA 72. 1.1 revised July 26, 2000Waterflow indicators covered by these requirements include sizes 3/4 inch and larger. The indicator sizes refer to the nominal inside diameter of the main sprinkler pipe or tubing on which they are installed.A vane type waterflow indicator is an assembly of a mechanism having electrical contacts arranged to transmit a coded or noncoded signal when the vane, located in the supply pipe (riser) of a sprinkler system, is moved by the flow of water in the pipe. This flow is normally caused by the opening of one or more sprinkler heads resulting from a fire condition. The signaling contacts are intended to be connected to circuits of private fire protective signaling systems.These requirements do not cover pressure-operated waterflow indicators.A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.