Jim ‘Slim’ Mimlitz, SCADAmetrics
Within water plants and pumping stations, it is often desirable to turn chemical pumps ON based upon the presence of positive flow. Sometimes, this is done using a mechanical “Flow Switch”, which completes an electric circuit upon the detection of flow in a pipe. Flow switches are often temperamental devices, and require regular tuning and maintenance.
Alternatively, a SCADAmetrics model EMP Signalizer can be combined with an inline flow meter and a simple time-delay relay to accomplish the same function — except with greater reliability.
The time-delay relay in our example is a Klemsan model Z1T-M2. This relay is rated for 10A and 250VAC; and it is available from Automation Direct (Atlanta, GA).
The drawing below illustrates how this can be accomplished.
Want to Learn More?…
Are you interested in learning more about how SCADAmetrics flow instrumentation, when paired with flow meters, can provide ON/OFF switching and 4-20 milliamp pacing of your chemical pumps? Give us a call!… We’ll be glad to discuss the details!