This is a typical layout that might be used in an application such as a cooling tower or pond. This layout can be used when the dosing is in to an open system or tank and there is no need to have the disinfectant injected into the system under pressure.
The ORP sensor measures the REDOX potential in the system and the PLC switches the machine on or off when the ORP reading is outside the parameters set by the end user. The advantage of this layout is that there is no need for a buffer tank or dosing pump. It is important that the dosing point is |
|
positioned after the sensor in the systems water flow to ensure that it is taking a true reading.
ORP sensors need to be calibrated on a regular basis following the manufacturer’s instructions. Ideally the stop start settings on the PLC should be set at least 50mv apart to avoid the generator starting and stopping for very short periods.
It is also possible to set the PLC so that if the ORP continuously stays outside the required band an alert can be sent via Ethernet or GPRS to your PC or cell phone. |
|
 |
