Good Laboratory Practices
Demand Great Laboratory Products! Meet GLP with OAKTON pH benchtop meters  | | Printed data from the OAKTON pH 1000 benchtop meter | All pH meters are not created equalan important consideration when purchasing instrumentation used to meet Good Laboratory Practices. GLP requires that time and date be recorded with the parameter reading (see Figures 1 and 2), so that in addition to the specific ranges and accuracies of the instrument, data storage and transfer capabilities are critical. There are many data storage options available, depending upon brand, model, and price range. Some pH meters store data when prompted. Others store it automatically within specified intervals. Still others store it continuously. The same holds true for data transfer. Some pH meters will transfer data to a secondary device as readings are taken. Others with internal memory will collect it over time and store it for later processing.  | | Computer data from the OAKTON pH 1000 benchtop meter | Which options should you choose? The most economical alternative is to purchase a pH meter with recorder outputs. These meters generate a continuous signal which can be fed to a chart recorder. However, to meet GLP they require a separate, concurrent time and date recorder, increasing the cost to the system. For optimal functionality, choose a unit with an RS-232 interface. This interface allows raw data to be transferred to your computer for analysis or for use in spreadsheet applications. Meters with this interface can easily transfer the date and time, fulfilling the GLP requirements. Our OAKTON pH meters offer a wide variety of options at prices that will meet any budget. The economical pH 700 benchtop meter with recorder output will handle basic applications requiring accuracy without automatic GLP data acquisition. To meet the GLP requirements with increased accuracy, our Oakton pH meters and electrodes will serve you well. In addition, if you are measuring ion concentrations via ISE electrodes, take a look at our new replaceable membrane ISEs. You don't need to replace the whole electrode, just the fill solution and membrane. These ISEs work perfectly with the ion concentration features of the pH 2500. |
