Electrical installation
Safety First: Do not perform wiring while the unit is powered on. Before any wiring work, turn off the power and disconnect the power supply.
CRITICAL WARNING: Do not apply overvoltage to communication lines The Modbus RS-485 communication lines (A/B) have a maximum rated voltage of typically 5 V. They must never be connected to or share continuity with the flowmeter's DC 24 V power lines. Incorrect wiring will instantly destroy the internal core components of the flowmeter. Damage caused by wiring errors is not covered under warranty. Always verify all wiring with a multimeter before powering on the device.
6-Pin Quick Connector Pin Definition
Connect the supplied cable to the power supply and the required communication interfaces. Unused wires must be insulated with protective material to prevent electric leakage or short circuits.
Before opening the unit or performing any wiring, turn off the power and disconnect the power supply.
Due to space limitations, the label on the side of the unit and the following diagrams show wire pin definitions only.
The 6-pin quick connector wire color assignments are defined as follows:
1
Brown
24 VDC (+)
2
Black
RS485 (B-)
3
Green
RS485 (A+)
4
Orange
NPN output (+)
5
Purple
4~20mA (+)
6
Blue
0 VDC (-)
24V DC Power Wiring Diagram
Brown wire: 24 VDC (+)
Blue wire: 0 VDC (–)
4–20 mA Analog Output Wiring Diagram
Brown wire: 24 VDC (+)
Blue wire: 0 VDC (–)
Purple wire: 4–20 mA (+)
NPN Output Wiring Diagram
Brown wire: 24 VDC (+)
Blue wire: 0 VDC (–)
Orange wire: NPN Output (+)
RS-485 Two-Wire Wiring Diagram
Black wire: RS-485 B (–)
Green wire: RS-485 A (+)
RS-485 Wiring Recommendations
It is recommended to use shielded 24 AWG twisted-pair cable and connect devices in a daisy-chain configuration. Do not use star or ring wiring.
For long cable runs, install termination resistors at both the master and the farthest device. A typical value is 120 Ω, but the actual value should be calculated based on the cable specifications.
If signal instability occurs, consider adding bias resistors at a point along the line.
For the supplied 6-core cable, when used for RS-485 communication, trim excess length to minimize noise interference. Route the shield braid along with the main communication wires and ground it.
In areas with heavy signal interference, the software may need to poll multiple times to receive a response. Implement a repeated polling mechanism in the communication program to distinguish between signal interference and actual device offline conditions.
Last updated