อุปกรณ์วัด pH (ISE Potassium Meter)
ISE Potassium Meter
The HI 84181 is a low cost, easy to use, potassium ISE meter that performs automatic analysis using an ISE electrode.
The instrument comes with a powerful built-in algorithm to analyze the shape of the ISE electrode response and to determine the reaction completion. The method used is the double standard addition which is a simple and rapid method of analysis.
By simply pressing the start key, the instrument guides the user and performs an automatic analysis with all the necessary calculations and verifications. The result is immediately displayed in g/L K+ (ppt), after which the HI 84181 is ready for another measurement.
Significance of Use
Potassium ions (K+) are absorbed by the vine from soil. Unlike other essential nutrients potassium remains in ionic form and passes to the grapes. Potassium ions are by far the most important ions that can be found in wine with concentrations between 0.7-2 g/L (ppt) and is mostly deriving from grapes. Potassium ions greatly influence the taste of wine. With its absence wine will have a sour taste.
The alcohol content and low temperatures can cause potassium to precipitate as potassium bitartrate. Red wines have an increased content of potassium compared to white wines because the phenols found in red wine inhibit the precipitation of potassium bitartrate.
Range 0.0 to 5.0 g/L (ppt) K+
Resolution 0.1 g/L (ppt) K+
Accuracy ±5% of reading (Above 2.5 g/L the instrument provides information about the approximate potassium content.)
Sample volume 50 mL
Temperature Compensation Automatic from 0 to 80 °C
HI 61014 potassium half cell with BNC connector and 1 m (3.3’) cable
HI 5315 reference half cell with BNC connector and 1 m (3.3’) cable
Temperature Probe HI 7662-T stainless steel temperature probe with 1 m (3.3’) cable (included)
Logging Feature 50 samples
Stirring Speed 500 rpm
Environment 0 to 50 °C (32 to 122 °F); max 95% RH non-condensing
Power supply 220V/50Hz; 10VA
Dimensions 208 x 214 x 163 mm (8.2 x 8.4 x 6.4″) (with beaker)
Weight 2200 g (77.6 oz.)
HI 61014 Potassium half cell
HI 5315 Reference Electrode for ISE Half-Cells
HI 740036P Plastic Beaker Set, 100 mL
HI 731342 2000 µL Graduated Pipette
HI 731352 Plastic Tip Set for 2000 µL Graduated Pipette
HI 740143 Graduated Syringe Set (6), 1 mL
Reagents & Standards
HI 84100-20 Reagent
HI 84181-0 ISA solution for potassium
HI 84181-1 Standard solution No.1 for potassium
HI 84181-2 Standard solution No.2 for potassium