![](https://www.almontazar.com/wp-content/uploads/2020/03/Model-641B-Air-Velocity-Transmitter.jpg)
Model 641B Air Velocity Transmitter
March 25, 2020![](https://www.almontazar.com/wp-content/uploads/2020/03/Series-DPW-Digital-Paddlewheel.jpg)
Series DPW Digital Paddlewheel
March 25, 2020The Series SFI-100T Sight Flow Indicators & Transmitters is a low cost and durable flow transmitter that combines our popular 100 Series Sight Flow Indicator with our A-711T output sensor for visual and remote monitoring of flow. The A-711T output sensor has two pulsed voltage signals with one providing a 5 VDC pulse, the other a pulse of the input supply voltage used, ranging from 8 to 28 VDC and a pulsed output with a frequency change proportional to the flow rate.