SUMMARY
This compact calcium ion meter measures calcium 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 useful for soil and crop management, food testing, coral aquarium water, and water-hardness assessment in rivers and lakes.
FEATURES
- Measures calcium ion concentration from only 0.3 mL of sample
- Measurement possible from 0.05 mL when using Sampling Sheet B
- Flat calcium 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 Ca-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, lake, tank, aquarium, 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-Ca-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) |
| 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 | ±20% of the reading*2 |
| Main Functions |
Adjustable low- and high-concentration calibration points Multiplication compensation coefficient: 0.01 to 9.90 Calcium 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*3 |
| 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*4 |
| Main Material | ABS resin |
| Dimensions and Weight |
W164 × H29 × D20 mm, excluding protruding parts Approximately 50 g, excluding batteries |
| Included Accessories |
S050 calcium ion sensor Two CR2032 coin-type lithium batteries One syringe Instruction manual Quick manual Storage case 150 ppm calcium ion standard solution, 14 mL × 1 bottle 2000 ppm calcium ion standard solution, 14 mL × 1 bottle Sampling Sheet B × 5 sheets |
| Main Consumables |
S050: Calcium ion sensor Y051H: 2000 ppm calcium ion standard solution Y051L: 150 ppm calcium 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 retaining cover.
*2 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.
*3 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.
*4 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 calcium contained in the sample.
The reference pH range for the calcium ion sensor is pH 4 to 12 at a calcium concentration of 10−3 mol/L.
Reported selectivity coefficients relative to calcium include Fe2+ and Zn2+ at 1, Fe3+ at 10, and Cu2+ at 1 × 10−2.
For quantitative comparisons, keep the sample preparation, dilution or extraction ratio, temperature, calibration procedure, and measurement conditions consistent.