This is an inquiry message about differential pressure switch in the 108th China Canton Fair. (这是一条买家关于"differential pressure switch"的询盘信息，来自第108届中国广交会。)Inquiry Message (询盘信息) differential pressure switch Our rooftop units use a Columbus Electric model RH-3 differential pressue switch to monitor the state/condition of the filters. We have reason to believe that several are no longer functioning. (They've been installed approximately 15 years.) Is this a product produced by your company? Is it or an equivalent still available? Contact Info (联系信息) Davis Griffith 14059 Company: Servotronics, Inc. E-mail: davis.griffith@servotronics.com davis.griffith@servotronics.com
