Two models of the GLI flow monitor/totaliser, available from PREI Instrumentation, can simultaneously accept inputs from up to four flow sensors, and provide the flow rate and totalised flow for each sensor. They have two 0/4 to 20 mA outputs, RS232 output and optional HART communication capability. There are also four SPDT relays that can be user-configured independently for alarm or control functions.
Six-bladed impeller flow sensors are also available to monitor the flow in pipes with diameters ranging from 12 to 100 mm. These sensors use a non-magnetic sensing technique that does not attract metal particles. The design of the impeller ensures accuracies within 1% for velocities from 9 down to 0,3 m/s. The pulsed output from the impeller has high noise immunity, and can be transmitted up to 600 m without amplification.
These flow sensors are suitable for water treatment systems, and especially for applications in reverse osmosis filtration systems.
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