Greystone Energy Systems Quality Standards, ISO Quality Management

Product Standards


The European Union (EU) has implemented a system to protect the health and welfare of consumers and users of manufactured products and these products are identified by the use of “CE Marking”. EU Directives and harmonized standards were created to ensure conformity to safely and quality standards throughout all member states of the EC. These directives are voted into laws by the respective countries and compliance is required by all manufacturers and importers. Greystone Energy Systems has successfully demonstrated compliance of several temperature and humidity products to the appropriate EU directives. As of December 31, 2000 Greystone products lines have been in compliance with the CE standard. All products shipped to European companies bare the CE mark and include the Declaration of Conformity.

Declaration of Conformity documents are located on each product page.

BACnet® is a data communication protocol for building automation and control networks. The detector communicates on a standard 2-wire RS-485 MS/TP (master-slave/token-passing) network designed to run at speeds from 9600 to 76800 baud over twisted pair wiring. BACnet is a registered trademark of ASHRAE.  ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards.  Compliance of listed products to the requirements of ASHRAE Standard 135 is the responsibility of BACnet International (BI). BTL is a registered trademark of BI. Greystone currently manufactures several products which utilizes BACnet® Communication.


Underwriters Laboratories Inc. (UL) is an independent, not-for-profit product safety testing and certification organization. UL has tested products for public safety for more than a century. Each year, more than 17 billion UL Marks are applied to products worldwide. Since the founding of UL in 1894, they have held the undisputed reputation as the leader in U.S. product safety and certification. Building on UL’s household name in the United States, they are becoming one of the most recognized, reputable conformity assessment providers in the world. Today, UL’s services extend to helping companies achieve global acceptance for their products, whether it is an electrical device, a programmable system or a company’s quality process. The Greystone Current Switch and Sensor lines have been tested under UL’s strict standards and have been certified to bear the UL mark. Visit to learn more about Underwriters Laboratories Inc.