PRINCIPLE OF OPERATION
Detection method
The sodium concentration is detected by a sodium selective glass electrode pair. The sodium sensor develops a potential proportional to the log of the
sodium concentration.
Chemistry
The pH of the sample is raised to 11.2 with a reagent to eliminate pH and ammonium interference. The water soluble, volatile amine reagent is completely consumed.
Calibration
Calibration based on the double known addition technique, with a user-selectable standard solution. The response characteristics of the electrode are monitored during calibration. The response data are used to diagnose the electrode performance and to reduce the calibration time.
MEASUREMENT
Measuring Range: 0.001–1000 ppb
Cation application: 0.01–100 ppm
Resolution: 0.001 ppb / 0.01ppm
Accuracy: 10% of measured value
or +/- 0.002 ppb Na+
Precision: 5% of measured value
or +/- 0.001 ppb Na+
Method: on-line potentiometry
Measuring volume: 20 ml
Calibration volume: 340 ml
Reagent: 1 Reagent
1 liter/3 months
Cation application: Acidity dependent
SAMPLE CONDITIONS
|
Temperature: |
5 … 45 ° C |
|
Pressure: |
0.1 … 6 bar (90 psi) |
|
Flow rate: |
min. 20 ml / min. |
|
Particles: |
less than 10 ppm, |
|
pH- value: |
between 2 and 12 |
ELECTRONICS
Display: LCD Display
|
Alarms: |
2 potential free relay outputs |
|
Outputs: |
4 - 20 mA |
|
Options: |
TTL or RS422/485 |
ELECTROMAGNETIC COMPATIBILITY
Complies with EN 50081-1 and EN 50082-2 for unrestricted use in rural and industrial areas.
