Holykell offers ultrasonic open channel flow meter for different shapes of flumes, channels, and weirs. And regarding the FAQs of transmission distance and solution for different signal outputs, here is the most complete and professional answer.

FAQ 1-How far can ultrasonic open channel flow meter 4-20mA transmit without any electromagnetic interference?

Electromagnetic interference requirements: 1. The power supply has no electromagnetic interference. 2. There is no electromagnetic interference on the wiring of the output signal. 3. There is no electromagnetic interference radiated from the air.

Solution:

For transmission distance within 100 meters, use 2×0.5mm2 shielded wire.

For transmission distance within 250 meters, use 2×1.0mm2 shielded wire.

For transmission distance within 400 meters, use 2×1.5mm2 shielded wire.

For transmission distance within 600 meters, use 2×2.5mm2 shielded wire.

What should we do if the four-wire system ultrasonic open channel flow meter 4-20mA transmits more than 600 meters?

We can add a 4-20mA repeater between the instrument and the PLC.

And here is the requirements for repeaters: 1. 24V DC power supply, 100mA current. 2. One channel 4-20mA in, one channel 4-20mA out.

FAQ 2-How far can ultrasonic open channel flow meters RS485 transmit without any electromagnetic interference?

Electromagnetic interference requirements: 1. The power supply has no electromagnetic interference. 2. There is no electromagnetic interference on the wiring of the output signal. 3. There is no electromagnetic interference radiated from the air.

Solution:

For transmission distance within 200 meters, use 2×0.5mm2 shielded wire.

For transmission distance within 400 meters, use 2×1.0mm2 shielded wire.

For transmission distance within 600 meters, use 2×1.5mm2 shielded wire.

What should we do if the four-wire system ultrasonic open channel flow meter 4-20mA transmits more than 600 meters? We can add a RS485 repeater between the instrument and the PLC. And here is the requirements for repeaters: 1. 24V DC power supply, 100mA current. 2. One channel RS485 in, one channel RS485 out.

FAQ 3-How far can ultrasonic open channel flow meters relay transmit without any electromagnetic interference?

Electromagnetic interference requirements: 1. The power supply has no electromagnetic interference. 2. There is no electromagnetic interference on the wiring of the output signal. 3. There is no electromagnetic interference radiated from the air.

Solution:

For 220V AC and transmission distance within 500 meters, use 2×0.5mm2 shielded wire.

For 24V DC and transmission distance within 500 meters, use 2×1.0mm2 shielded wire.

What should we do if the four-wire system ultrasonic open channel flow meter relay transmits more than 500 meters? We can make the wire thicker, for example: use 2×1.5mm2 two-core shielded wire.

We have professional engineers for more technical solutions, welcome to contact us for them.