SUMMARY
This compact potassium ion meter measures potassium ion concentration by applying a small amount of sample, from only 0.3 mL, directly to the flat sensor.
LAQUAtwin's unique planar ion-selective electrode enables quick and reliable measurement in a compact, portable format.
It is especially useful for measuring potassium ions in soil extracts and hydroponic nutrient solutions.
FEATURES
- Measures potassium ion concentration from only 0.3 mL of sample
- Measurement possible from 0.05 mL when using Sampling Sheet B
- Flat potassium ion-selective sensor with excellent selectivity
- Wide measurement range from 4 to 9900 ppm (mg/L)
- Up to two calibration points
- Low- and high-concentration calibration points can be adjusted
- Temperature sensor adjustment function
- Auto Hold function
- Auto Stability function
- Backlit monochrome digital LCD
- Automatic power-off after 30 minutes
- Remaining battery level display
- IP67 water-resistant construction
- Replaceable sensor
- Portable storage case and measurement accessories included
VERSATILE SAMPLING METHODS
LAQUAtwin's flat-sensor design allows samples to be applied or collected in several convenient ways. Choose the method that suits the sample and measurement purpose.
Direct Drop Measurement
Apply a liquid sample directly to the flat sensor with a syringe, pipette, or dropper. The K-11 requires at least 0.3 mL for direct measurement. Sampling Sheet B allows measurement from as little as 0.05 mL.
Immersion Measurement
For liquid samples in a beaker or container, the sensor can be immersed directly in the sample. Open the sliding cap on the sensor guard before measurement.
Scoop Sampling
The sensor guard can be used to scoop a liquid sample directly from a river, tank, nutrient solution, or other sampling location for convenient on-site measurement.
Surface Sampling with Sampling Sheet B
Sampling Sheet B can be moistened with pure water and used to collect a sample from a surface before being placed on the sensor.
Moist Solid Samples
Moist solid samples such as foods can be cut into small pieces and placed directly on the flat sensor for measurement.
Powder Samples
Place the powder sample on the flat sensor and add a fixed amount of pure water before measurement.
Paper, Textiles, and Sheet-like Samples
Cut paper, textiles, or other sheet-like samples into small pieces, place them directly on the flat sensor, and add a fixed amount of pure water before measurement.
SPECIFICATIONS
| Model | LAQUAtwin-K-11 |
|---|---|
| Measurement Principle | Ion-selective electrode method |
| Required Sample Volume |
0.3 mL or more Measurement from 0.05 mL is possible when using Sampling Sheet B*1 |
| Measurement Range |
4 to 9900 ppm (mg/L) 2 to 5000 kg/10a*2 |
| Resolution |
0 to 99 ppm: 1 ppm 100 to 990 ppm: 10 ppm 1000 to 9900 ppm: 100 ppm |
| Temperature Display Range / Resolution | 0 to 50°C / 0.1°C |
| Calibration |
Up to 2 points Default calibration values: 150 ppm and 2000 ppm |
| Accuracy | ±10% of the reading*3 |
| Main Functions |
Adjustable low- and high-concentration calibration points Multiplication compensation coefficient: 0.01 to 9.90 Potassium ion concentration, temperature, and mV display modes Temperature sensor adjustment function Auto Hold Auto Stability function Automatic power-off after 30 minutes Remaining battery level display Replaceable sensor |
| Water Resistance | IP67 equivalent*4 |
| Display | Custom monochrome digital LCD with backlight |
| Operating Environment | 5 to 40°C, 85% relative humidity or less, non-condensing |
| Power Supply | Two 3 V CR2032 coin-type lithium batteries |
| Battery Life | Approximately 400 hours of continuous use with the backlight switched off*5 |
| Main Material | ABS resin |
| Dimensions and Weight |
W164 × H29 × D20 mm, excluding protruding parts Approximately 50 g, excluding batteries |
| Included Accessories |
S030 potassium ion sensor Two CR2032 coin-type lithium batteries One syringe Instruction manual Quick manual Storage case 150 ppm potassium ion standard solution, 14 mL × 1 bottle 2000 ppm potassium ion standard solution, 14 mL × 1 bottle Sampling Sheet B × 5 sheets |
| Main Consumables |
S030: Potassium ion sensor Y031H: 2000 ppm potassium ion standard solution Y031L: 150 ppm potassium ion standard solution |
*1 Measurement is possible from 0.05 mL when using Sampling Sheet B. Close the sensor cover during measurement. For samples containing fine particles, use a separate sampling sheet holder cover.
*2 Applicable when the soil-to-water extraction ratio is 1:5.
*3 Indicates repeatability when the same standard solution is measured after calibration with that standard solution. Error in the standard solution and rounding error of ±1 digit are not included.
*4 Equivalent to IP67. The meter will not fail after immersion in water at a depth of 1 m for 30 minutes. It cannot be used underwater.
*5 Battery life is reduced to approximately one-third when the backlight is used. The backlight remains illuminated for approximately 20 seconds.
Technical Measurement Notes
Measurement values may be affected by ions other than potassium contained in the sample.
The reference pH range for the potassium ion sensor is pH 2 to 9 at a potassium concentration of 10−3 mol/L.
The stated selectivity coefficient for rubidium ions (Rb+) is 1 × 10−1 relative to potassium.
For quantitative comparisons, keep the sample preparation, dilution or extraction ratio, temperature, calibration procedure, and measurement conditions consistent.