The LU-55YM series heat totalizer can perform both cooling energy measurement of liquid coolants and heat measurement of heat carriers at the same time. Its core features are as follows:
Supports input from a wide range of flow sensor signals, covering vortex, turbine, electromagnetic, Roots, oval gear, dual-rotor, orifice plate, V-cone, Annubar and thermal types;
The flow input channel accepts frequency signals and various analog current signals, the pressure input channel accepts various analog current signals, and the temperature input channel accepts signals from various RTDs and thermocouples;
Provides 24V power to transmitters, simplifying the system and saving investment;
Fault-tolerant: when the temperature or pressure/density compensation measurement signal is abnormal, the corresponding manually set value is used for the compensation calculation;
Extensive self-check and self-diagnosis functions facilitate use and maintenance;
There are no potentiometers, coding switches or other adjustable components inside the instrument, improving shock resistance, stability and reliability;
Supports multiple communication modes for data communication with a host computer, allowing an energy metering network system to be built;
Performs high-accuracy compensation calculation for hot water, general gases, superheated steam, saturated steam, natural gas and other liquids.
Main technical specifications
Measurement accuracy: class 0.2 (±0.2% FS±1 digit)
Input signal
Flow signal: pulse greater than 2V (>4V is high level, <1V is low level), frequency 1-9.5kHz, 0-10mA, 4-20mA current;
Pressure signal: 0-10mA, 4-20mA current;
Temperature signal: RTD, thermocouple.
Output signal: up to 2 transmitter outputs of 0-10mA or 4-20mA, freely settable; the transmitter parameter (flow, pressure, temperature) and range are freely settable.
Alarm output: up to 4 relay outputs (resistive 250VAC/0.8A)
Output power supply: DC24V/50mA transmitter supply
Communication interface: RS-232, RS-485, optoelectronic isolation
Display: 240*160 dot-matrix LCD
Data protection: data retained for ten years after power failure
Power supply: AC (85V-265V); DC24V supply optional (please note when ordering); power consumption < 8W
Panel size: 96mm×96mm, 80mm×160mm
Operating environment: temperature -10~+60°C, humidity 0~80RH%
Dimensions and mounting dimensions
Type A: dimensions (W×H×D) 969677mm, cutout 92mm×92mm;
Type D: dimensions (W×H×D) 1608077mm, cutout 153mm×76mm (the document notes a cutout dimension related to 80mm).
