Orion Dual Star pH/ise dual Channel Benchtop Meter User Manual
Yüklə 0,73 Mb. Pdf görüntüsü
|
- Bu səhifədəki naviqasiya:
- Section 5
Section 5 |
Methods Editing or Printing an Existing Method 1. In the measurement mode, press the method key. 2. Dual channel display only: Press the ▲ / ▼ keys to select the channel that the method will be saved on and press the f2 (accept) key. 3. The meter will display Current Settings and a list of the saved methods. The list will show the sequential number of the methods (M101) and if any methods were previously saved, the list will show the date that the method was last saved (10/05/2008) and the electrode ID used in the method (pH). 4. Press the ▲ / ▼ keys to highlight the method that will be edited press the f3 (options) key. 5. Enter the current password (default password is 111111111) and press the f2 (accept) key. 6. Press the ▲ / ▼ keys to highlight Edit and press the f2 (accept) key. 7. To print the method, press the f3 (print) key. 8. To edit the method, press the ▲ / ▼ keys to highlight Measure Mode, Electrode ID, Electrode Serial Number, Resolution, Temperature Calibration, Calibration Setup, Temperature Input, Read Type, Alarm or Sample ID and press the f2 (select) key. 9. Review and change any of the method settings listed above. To select a setting from a list of options, press the ▲ / ▼ keys to highlight the desired option and press the f2 (accept) key. To enter a numeric value, use the numeric keypad, decimal key and +/- key as required and press the f2 (accept) key. See the Setup Menu section for details on each method setting. 10. Press the f1 (back) key to return to the list of methods. Press the f1 (back) key to return to the measurement mode.
Coping an Existing Method 1. In the measurement mode, press the method key. 2. Dual channel display only: Press the ▲ / ▼ keys to select the channel that the method will be saved on and press the f2 (accept) key. 3. The meter will display Current Settings and a list of the saved methods. The list will show the sequential number of the methods (M101) and if any methods were previously saved, the list will show the date that the method was last saved (10/05/2008) and the electrode ID used in the method (pH). 4. Press the ▲ / ▼ keys to highlight the method that will be copied press the f3 (options) key. 5. Enter the current password (default password is 111111111) and press the f2 (accept) key. 6. Press the ▲ / ▼ keys to highlight Copy and press the f2 (accept) key. 48 |
Orion Dual Star pH/ISE Benchtop Meter User Manual Thermo Scientific Methods |
Section 5 7. Press the ▲ / ▼ keys to highlight the method number that the existing method will be copied to and press the f2 (accept) key. 8. The meter will automatically proceed to the measurement mode.
Deleting an Existing Method 1. In the measurement mode, press the method key. 2. Dual channel display only: Press the ▲ / ▼ keys to select the channel that the method will be saved on and press the f2 (accept) key. 3. The meter will display Current Settings and a list of the saved methods. The list will show the sequential number of the methods (M101) and if any methods were previously saved, the list will show the date that the method was last saved (10/05/2008) and the electrode ID used in the method (pH). 4. Press the ▲ / ▼ keys to highlight the method that will be deleted press the f3 (options) key. 5. Enter the current password (default password is 111111111) and press the f2 (accept) key. 6. Press the ▲ / ▼ keys to highlight Delete and press the f2 (accept) key. 7. Press the f2 (yes) key to delete the method or press the f3 (no) key to retain the previous settings. 8. The meter will automatically proceed to the measurement mode.
Thermo Scientific Orion Dual Star pH/ISE Benchtop Meter User Manual |
6 Incremental Techniques The Orion Dual Star meter has preset methods for single known addition, single known subtraction, double known addition and double known subtraction. • When performing incremental techniques, the sample concentration must be known within an order of magnitude so the increment may be correctly chosen and the sample and standard must be volumetrically determined. • It is very important that any complexing agent is present in excess (at least 50 to 100 times) or not at all. The ratio of free to complexed ions must remain constant over the addition. An indication that a complexing agent is present, but not in great enough quantity to maintain a constant free ion to complexed ion ratio, is an abnormally high or low slope. If this is a suspected problem, add an excess amount of complexing or decomplexing agent to the original solution in the beaker. • Electrode interferences should be at a minimum, since the effect of the interference might change as the concentration of the ion of interest changes. This situation may also result in high or low electrode slopes. Consult the electrode user guide for information on reducing or eliminating some electrode interferences. • Known addition is a useful method for measuring dilute samples, occasional samples or samples that contain an excess of complexing agent. It can also be used to verify the results of a direct measurement. • Known subtraction is useful when measuring ions for which stable standards do not exist. It can also be used as a quick version of a titration. When performing a known subtraction, it is necessary to know the stoichiometric ratio between the standard and sample. • Double incremental techniques calculate the electrode slope and sample concentration simultaneously. The electrode slope is determined directly in the sample, which results in greater accuracy for samples with complex matrices and greater analysis speed. S E C T I O N 6
|
Orion Dual Star pH/ISE Benchtop Meter User Manual Thermo Scientific Yüklə 0,73 Mb. Dostları ilə paylaş:
|