DS-100RF is a fixed mounted ultrasonic calorimeter. Their electronic enclosures are rated as IP65 (NEMA 4X), thus, can be installed for both indoor and outdoor. Better than 0.1accuracy. 0.2% of repeatability. Positive/negative/net flow or heat totaliser. 2 line LCD display. MODBUS/MBUS/HIPEAK protocol. 4~20mA/PT100 platinum resistance input. Relay/OCT/RS-485/4~20mA/ 0~20mA output. Power supply by 24VDC or 85~264VAC.