The SITRANS WM300 MFA detects changes in the motion and speed of rotating, reciprocating or conveying equipment. It warns of equipment malfunction and signals through contacts to shut down machinery in case of a slowdown or failure. Its reliability makes it a cost-effective way to protect valuable process equipment. The dual setpoint system suits most industrial applications. This versatile unit can be used on tail pulley shafts, driven pulleys, motor shaft sensing, belt or drag conveyors, screw conveyor flights, bucket elevators, fans and pumps. Multiple machines can be monitored with twin, independent probe inputs as well as an additional 2 inputs for differential speed detection (DSD) within a machine monitoring solution such as a belt conveyor comparing the head to tail pulley speeds. An optional analog output module can convert the WM300 into a non-contacting tachometer (NCT) with 2 mA outputs. A special feature is the adjustable 0 to 60 second time delay, allowing the monitored device to accelerate to normal running speed before monitoring begins. A wide range of probes are available to suit specific needs, including high temperatures and corrosive installations. SITRANS WM300 MFA consistently meets the needs of mining aggregate, cement and other primary and secondary industries. Key Applications: tail pulleys, motor shaft sensing, screw conveyor flights, bucket elevators

Industry Mall

Select and order


  • Up to 100 mm (4 inch) gap between target and probe

  • Over and under speed setpoint detection

  • Setpoint adjustment range 2 to 5 000 Hz (120 to 300 000 ppm).

  • Adjustable start-up time delay

  • Visual indication of probe operation and relay status

  • General purpose, suitable for majority of industrial applications;
    rugged probe designs provide unmatched reliability.


Measurement Types
Non-contact motion monitoring, differential speed detection and tachometer
Measurement Range
Up to 100mm (4“)
4 relays
2, 4 ... 20 mA outputs (NCT)
Process Connections
2“ NPSL motion probes
Process Connections
Remote display, high temp probes, mA output card, MSP- 12 converter

Download, Support, Services

Find downloads, support and services for Siemens process protection

The fastest way to the experts

Proposed solutions for your queries and direct access to our experts in Technical Support.

Service offers

To remain competitive, companies in industry must ensure – and ideally increase – the availability and productivity of machines and plants. As your partner, we offer a unique range of services and support based on our extensive technology and industry expertise.

Service catalog

As your partner, we offer a unique range of services and support based on our extensive technology and industry expertise. With our offerings, you can expect a high degree of reliability and a successful digital future for your company.

Well trained for excellent handling

Receive standardized or individual expertise directly from the manufacturer – with training centers in more than 60 countries.

Safety integrated

Safety is key in the process industries. A failure in instruments relevant for safety may have serious implications for humans, the process and the environment. Therefore, a wide range of our process instruments come with on-board safety features for maximum risk reduction.


How can we help you?

Whether you need to measure pressure, temperature, flow, level or weighing, Siemens has best-in-class instruments to suit the unique needs of your plant or application - along with a global network of technical support available 24 hours a day, 7 days a week. Our high-performance and cost-efficient range of industrial solutions also includes devices for valve positioning, process protection, recording, controlling, communication and more.

Your direct line to Siemens

Contact your regional partner