Specifications

23G-Series RO System
3024270 Rev G 80 14Oct13
6.2 pH Controller/Sensor (ECM-100-pH)
A factory installed pH sensor can be connected to your ECM-100. A
high/low pH alarm is included with the pH sensor and should be set at pH
7 and 4, respectively (unless special instructions or conditions indicate
otherwise) to protect against excess or loss of buffer feed. If the high pH
alarm deactivates the machine, the buffer tank and buffer pump must be
checked to ensure that buffer is being fed properly, and that the pump is
primed. The system is restarted by pressing OFF and then ON on the
ECM-100. This will energize the chemical pump so it can be properly
adjusted. The system will stop again according to the alarm timer if the pH
remains in the high or low alarm range. When wired for acid pump control,
the ECM-100 will turn on the acid pump at 0.8 pH units less than the high
pH alarm limit and will turn off the acid pump at 1.8 pH units less than the
high pH alarm limit whenever the RO pump is running (except during CIP
mode).
Initial calibration of pH sensors is done at the factory. Accuracy should be
rechecked at startup and at least monthly when in service, with a test kit or
laboratory pH meter. Permeate pH must not be used for calibration of the
ECM-100 pH reading or adjustment of the chemical pump. To calibrate the
pH reading, refer to the calibration procedure included in Section 8.0.
The pH probe may have to be cleaned or replaced some time after 6 to 24
months of operation, depending on the type of use. Refer to the Spare
Parts List (Section 11.0) for specific Mar Cor Purification part numbers.
Clean by soaking the glass electrode for 10 minutes in a 2 pH acid (the
type used for buffer).
NOTE:
23G machines built after September 1997 contain Version 2 (V2) circuit
board. This new circuit board includes the extra electronic components
built into the circuit board. When ordering replacement pH kits identify
whether you have Version 1 (machines built prior to September 1997) or
Version 2 (machines built after September 1997).