The Badger Meter Series 250 Flow Sensors feature a closed, six-bladed impeller design with a non-magnetic sensing mechanism. The mechanism is mounted in a cast bronze housing with female NPT threads. The unique impeller design is less prone to be fouled by waterborne debris. The forward-curved shape coupled with the absence of magnetic drag provides improved operation and repeatability even at lower flow rates. This is especially true where the impeller is exposed to metallic or rust particles found in steel or iron pipes.

As the liquid flow turns the impeller, a low-impedance square wave signal is transmitted with a frequency proportional to the flow rate. The signal can travel up to 2000 feet (610 meters) between the flow sensor and the receiving unit without the need for amplification. All sensors except irrigation versions are supplied with 20 feet of 2-conductor 20 AWG shielded UL type PTLC cable, and meet CE standards for noise immunity and susceptibility. Recommended design flow range is 0.3 to 15 ft/sec with accuracy ±1.0% of rate. Maximum pressure 400 psi at 100°F. Temperature ratings: standard 221°F continuous, irrigation 150°F, high temp 285°F continuous (305°F peak).