Taking Control of your pH! You can save time and money
with a complete pH control system Controller Options System Enhancements Recommendations Proper control of pH requires more than just a controller. The most basic pH neutralizing system is comprised of a controller, a pH electrode, and two metering pumps—one to dispense acid, the other to dispense base, depending upon which is needed to neutralize the effluent. However, there are several other devices and controller options available that ensure pH is measured correctly, that a long-term record is maintained, and that chemical is properly added and mixed.  | | OAKTON pH 100 controller | Reagent dispensing is managed by relays within the controller. The most basic relay provides on/off control at a desired set point. The economical on/off relay is the least precise control method as it has a tendency to take longer to reach the desired set point. A second, more precise relay control option, is proportional control, which switches the relay on or off for a set period depending upon how close the reading is to the set point, and offers an improved feedback. The third, most precise option is proportional integral (PI) control, which compensates for previous relay adjustment and other variations that may affect reaching the set point. Though an additional up-front expense, PI control offers cost savings in the long run due to more accurate dispensing of reagents. Mixers, recorders, dataloggers, level sensors, and alarms are system enhancements which can save additional time and money by maximizing your use of reagents and increasing your monitoring capabilities. For example, mixers blend chemicals as they are being added, creating homogeneity and ensuring that the pH reading taken is a proper representation of your solution. Thus, mixers minimize the potential overuse of reagents. Recorders and dataloggers can increase the accuracy of your readings, and free you from the bonds of physically having to monitor every reading—plus, you'll have all previously measured data at your fingertips. Level sensors ensure that your system maintains adequate levels of reagents, which can easily become depleted if not checked periodically. Depending on your controller selection, you may also want to opt for the use of strobe lights or audible alarms to indicate when a desired set point has been reached. The 1/8-DIN, OAKTON pH 100 Controller is an excellent, general-purpose unit. It offers on/off control with dual set points, and has advanced functions generally found only on more expensive models—including password protection to prevent tampering, and user-friendly prompts for setup and calibration. A 4-20 mA output version is available to further assist in your control application. | |