How Open Channel Flowmeters Work

Open channel flowmeters perform flow measurement of liquids that are open to the atmosphere at some point in the 

flow measurement path. The liquid may be entirely open to the atmosphere, or may be contained within a closed pipe 

that is not full of liquid and only open to the atmosphere at the installation point of the flowmeter itself.

Regardless of which type of open channel flow measurement techniques are used, level measurement must be used 

in combination with velocity measurement, and a flow computer using the manning equation of open channel flow to 

calculate the true flow rate of any wetted channel (pipes, streams, etc).

Applications

The MTMQ-F open channel flowmeters may be used in rectangular, circular, trapezoidal or other shaped channels. 

Since the transducers create almost no restriction, virtually no head loss is created.

Features

1. The MTMQ-F Open Channel Flowmeter can show level, distance or flow on the display. The relays can be programmed to activate alarms, pump starters or other control equipment.

2. 4-20mA output that can be connected to a chart recorder or PLC, to monitor level space or distance, independently from that shown on the display.

3. There is an RS485 port, so that the MTMQ-F Open Channel Flowmeter can be operated remotely by a PC or other equipment.

4. All the parameters are stored in non-volatile memory, so the information is rtained in the event of power interruption.