LST400 | ULTRASONIC LEVEL TRANSMITTER | OI/LST400-EN REV. E
29
4-20mA (including HART Communication)
Active Mode
Passive Mode
NOTICE
If SW2 is set as Passive Mode, the polarity is opposite as
shown in figure above.
Relays (Relay Output)
• Max. 5 relays can be set for LST400 (Relay 1 – 5)
• Type: 1 Form C (Changeover)
• Rating: 12A@250VAC
• Functions: pump control output, alarms, etc.
Transducer (Transducer)
• Connect ‘BLACK’ with the black wire, which is for
temperature signal.
• Connect ‘SHIELD’ with shield, which is for common ground
of both signal wires.
• Connect ‘BLUE’ with blue wire, which is for measurement
signal.
Fuses (F1 & F2)
Fuses can only be replaced by a trained electrical technician if
broken.
Fuse specifications:
• F1: 250VAC 50mA time lag
• F2: 250VAC 80mA time lag
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