Bio tech flow consumption monitoring system bio tech ars 261 the ars 261 is a microprocessor controlled universal display and analysis unit for reading two separate pulse meters the compact and rugged unit is specifically designed for industrial use the device can detect any pulse shape from 5 to 24 v dc with the ars 261 the difference flow and total flow can be measured indicated and summed the scaling can be freely selected and adjusted to the sensor constant connectable with 2 co