TDS-100Z ultrasonic flow/caloric transmitter work alone without a LCD and Keypad, you can modify the parameters from the remote unit.
Feature:
0.2% of repeatability
Better than 1% of accuracy
Positive/negative/net flow and heat totalizer
2 line LCD display
4-20mA/PT100 input
OCT/RS485/4-20mA output
MODBUS protocol
24VDC power supply, 85-264VAC for remote unit