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Heat Meter Tv 7. To Complete The Heating Unit, Heat Meter Tv7 (Manufactured By Termotronik Llc, St. Petersburg). The Device Is Designed To Measure, Calculate, Accumulate And Archive Data: Amount Of Thermal Energy (Heat); Coolant Parameters (Flow, Temperature, Pressure) In Closed And/Or Open Water Heating Systems; Can Be Used In Heating Systems, Hot/Cold Water Supply. Main Technical Characteristics. Weight: About 0.9 Kg. Dimensions: 250X160x75 Mm (Approx.). Degree Of Protection: Ip54. Intervalidation Interval (Mpi): 4 Years. Certified: Registration Number In The State Register Of Measuring Instruments. Working Life/Average Service Life: 12 Years Average Service Life, Time Between Failures - About 75,000 Hours. Metrological Characteristics: Thermal Energy Measurement Error: No More Than ±(0.5 + Δtmin/Δt)% Or ±(0.1 + 10/Δθ)%. Error In Measuring Coolant Mass: No More Than 0.1%. Measurement Error Of Average Volume Flow: ±(0.01 + 1/T)% (Where T Is The Measurement Period). Interfaces/Communications: Basic: Usb (Device) Interface. Optional: Rs232, Rs485, Ethernet, Remote Gsm/Gprs Modem. Data Archive: Hourly, Daily, Monthly Archives; Sd Cards Are Often Supported. Other Features: Parameter Settings Via The Keyboard On The Front Panel Or From A Computer. Protection Against Unauthorized Intervention. Supports Multiple Heating Schemes. Power: From External Source + Built-In Battery (On Some Models). Connected Channels: From 1 To 3 Thermal Inputs (Depending On Modification). Connected Flow Meters: Up To ~7 (For The Tv7-03M Model). Temperature Channels: Up To ~8 Sensors. Pressure: Up To ~6 Sensors (For More Complex Modifications) (For Retrofitting)