ANKA Sci-Tech Co.,Limited is one of the leading China heat detector aj-521 manufacturers and suppliers,Website: , and also a professional company equipped with productive factory, we are always able to offer you cheap or low price heat detector aj-521 with reliable quality.why choose us1).2000 square meters factory, have capability to supply wide range of products2).Good quality control ,with competitive prices.3).Prompt delivery.4).Good after-sales service.5).No Minimum order quantity limited.OEM and ODM are also accepted.6).We locate in Shenzhen of China, easy for export.Product DescriptionSpecificationsCombination rate-of-rise and fixed temperature alarmMCU processing, eliminate false alarmLow standby currentAnti-RFI & Anti-EMI9-35VDC wide operating voltage rangeLED flashing visible in 360 degrees directionPower supply non-polar inputRemote LED indicator output (2 wire)Dustproof, mothproof, anti-light interference designExecute criterion: GB4716, EN54-5Model NO.2wireHeat detector,2-wire,network by Current4wireHeat  detector,4-wire,network by RelayOperating voltage:DC9-35VStatic current:≤50uA12mA(NC);2mA(NO)Alarm current:35mA(12V);83mA(24V)5mA(NC);15mA(NO)Alarm output:Remote LED IndicatorRelay outputAlarm temperature:57℃/137F or 8~15℃/Min(Rate-of-Rise)Installation:Ceiling mountedWorking environment:-10℃~+50℃,Humidity≤95%RHClear Picture：              Our Services:1.We guarantee that all our items are "as stated" in their descriptions. We strive for 100% customer satisfaction on every sale we complete.2.We are manufacture, there is no middle man, no high markup, so we can provide quality items yet very competitive price.3.If you have any questions please contact us first, most are responded with in 12 business hoursPaymnet:1.T/T2.West Union3.Trade Assurance4.PaypalShipmet1,all package can sent by FedEx/DHL/UPS/EMS, based on customer requires.2,Freight By Sea to Any nearnest port of customer country.3,Freight by Air to airport of import country.Company InformationANKA is a high-tech enterprise specializing in the whole process of Research, Development, Manufacture and Marketing security alarm products. With the company policy of "Innovative technology, Makes safe life" and the responsibility of "Progress for protecting people's safety", FQA1.Quality of our company.We are the manufacturer of alarm system for more than 10 years, we are full of experience and technology.2.Quality of our products.Our engineers who ever worked in a very famous company of alarm system, all the products must be strictly inspected before selling.3.Quality of our services.All of our products have a full two-year warrantyand low repair rate.4.Quality of our shippment.We arrange the shippment as soon as we get the payment, fastly and professionally.5.Quality of our sales representatives.Truly, Warmly, Patiently, Professionally.