“Flow transmitter” and “flow meter” get used almost interchangeably in day-to-day conversation, but they describe two different jobs in a measurement system. Understanding the difference makes it much easier to specify the right equipment — and to work out whether your project needs a standalone transmitter at all.

The image below shows the Sitrans FMT020 transmitter that can be mounted remote from or directly to the Sitrans FM Series Meter Sensor. This combination is a complete Flow Meter. Click on image bel;ow to check out the transmitter details

What a Flow Meter Does

A flow meter is the device that physically senses flow — whether that’s a turbine spinning in the fluid stream, an electromagnetic field detecting conductive flow, or an ultrasonic signal timing sound pulses through the fluid. Its job is to generate a raw measurement of flow rate or total volume.

What a Flow Transmitter Does

A flow transmitter takes that raw measurement and converts it into a standardised signal that other equipment can actually use — typically a 4-20mA analogue signal, or a digital protocol such as HART or Modbus. Without a transmitter, a flow meter’s reading generally can’t be sent to a PLC, SCADA system, or remote display; the transmitter is what bridges the gap between the sensing element and the rest of the control system.

In many modern flow meters — particularly electromagnetic and ultrasonic designs — the transmitter is built into the same housing as the sensor, sold as a single integral unit. In other setups, especially where the meter is mounted somewhere difficult to access, a remote transmitter is connected by cable and mounted somewhere more convenient to read and wire into the control system.

Why the Distinction matters When your Specifying

Knowing which one you’re actually shopping for avoids a common and costly mistake: ordering a flow sensor without checking whether it includes the transmitter functionality your control system needs, or vice versa. If your project already has compatible signal-processing equipment in place, you may only need the sensing element. If you’re starting from scratch, an integral meter-plus-transmitter unit is usually the simpler, lower-maintenance choice.

BES Flowmeters Range

BES Flowmeters supplies both integral and remote-transmitter configurations across our flow meter range, including electromagnetic and turbine options with built-in transmitters as standard. If you’re not sure which configuration your project needs, our team can walk you through it before you order.

Frequently Asked Questions

Is a flow transmitter the same as a flow meter?

No. A flow meter is the sensing device that measures the physical flow of liquid or gas. A flow transmitter takes that raw measurement and converts it into a standard electrical or digital signal — such as 4-20mA or a digital protocol — that can be read by a PLC, SCADA system, or display.

Do I need a separate flow transmitter for every flow meter?

Not always. Many modern flow meters, particularly electromagnetic and ultrasonic models, come with the transmitter built into the same housing as an integral unit. Others use a remote transmitter connected by cable, which is useful where the meter itself sits somewhere hard to access for readouts.

What output signal does a flow transmitter provide?

Most industrial flow transmitters provide a standard 4-20mA analogue signal, though many also support digital protocols such as HART, Modbus, or pulse output, depending on the model and what your control system needs to receive.