BTU metering BTU metering Features Ultrasonic Inline type BTU meterMeters are manufactured in EuropeIP65 ProtectionMID Approved metersSize from 20mm to 400mmDN 50-100mm Brass HousingDN 100-400mm Steel Hosuing Calculator Features 3.6 VDC battery D-Cell Lithium (lifetime Not less than 11 years)230 VAC power supply8 Digit LCD DisplayTemperature sensor Pt 500IP65 RatingTemperature range 0 °C up to 180 °CM-Bus output & option for RS232/RS485/Modbus/Wireless 868 MHzReal Data or Open Metering StandardOther optional modules (Plug & Play)EEPROM memoryUp to 36 month data logger capacity for daily & monthly records Ultrasonic Clamp- On type BTU Meter