In this example, the RealTech Controls model ETX water hardness controller sends a mA signal signal representing the water hardness in CaCO3 (Calcium Carbonate) to a PR-4114 transmitter which converts the signal into grains per gallon, as required by the customer.
The reading now in GPG (grains per gallon) is sent to a PR-5714 panel meter display to display the reading on the front of the control panel. The ETX Controller has a standard 3 x Relay set-point / alarm outputs, a mA output representing the water hardness, and MODBUS RTU as standard.
An alternate display panel shows the same ETX water hardness controller on the front of a panel with 3 x red alarm lights connected to the set-point alarm relays inside the controller. All 3 x alarms have been activated for the purpose of presentation.
This plug-and-play design requires the customer to simply install the sensor in the water flow, and plug the power cord into a standard power outlet. The system has been pre-calibrated and set up to achieve the measurement of water hardness in grains per gallon on the front panel meter display, while the water hardness Calcium Carbonate value is displayed inside the panel on the ETX controller.