4.2 Wiring Instructions
1: Cable requirements: use shielded cables, the wire diameter is about 0.75mm, and the copper wires at
the wiring must be tightened without burrs;
2: Different instruments, the wiring methods are different:
A. For instruments with lead wires, the following are the meanings of each connection wire (for
reference only):
Red wire: Power positive input (12 to 24V)
Black wire: power ground wire
Yellow wire: 4~20mA output or RS485A
Green wire: RS485B
B. For instruments without lead wires, the user needs to open the instrument shell and connect wires to
the inside terminals. The following figure is the description of each terminal:
Warning: The wiring work must be performed by professionals, otherwise it may cause electric
shock or damage to the instrument.
J1
24V
GND
4-20mA
GND
RS485A
RS485B
Power
Signal output
Low
Alarm
Relay
High
Alarm
Relay
J2
Motherboard connector JP1
J3
Alarm
Digital probe portDigital probe port
S1
Note: Do not connect wires with power on at any time.
NO:Normally open
COM:Common
24V:24+,positive
GND:24-,negative
4~20mA:4~20mA analog
signal
Wiring diagram
(Optional)
COM
NO
COM
NO
* High alarm relay (Optional) .
9
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