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Specifies the measurable pH range of the instrument.
Defines the smallest increment the pH meter can display.
Indicates the deviation from the true pH value.
Details the process for calibrating the pH meter.
Information about the included pH electrode model.
Specifies the operating temperature and humidity limits.
Identifies the type of battery required for the instrument.
Provides an estimate of the battery's operational duration.
Details the automatic power-off feature settings.
Lists the physical size of the instrument.
Specifies the weight of the instrument.
Instructions for preparing and storing the pH electrode.
Steps for taking pH measurements with the Checker Plus.
Details on visual indicators for immersion and battery status.
Step-by-step guide for calibrating the pH meter using buffer solutions.
Guidance on calibration errors and buffer solution use.
Procedure to reset the meter to default calibration settings.
Instructions for replacing the instrument's battery.
Specifies the measurable pH range of the instrument.
Defines the smallest increment the pH meter can display.
Indicates the deviation from the true pH value.
Details the process for calibrating the pH meter.
Information about the included pH electrode model.
Specifies the operating temperature and humidity limits.
Identifies the type of battery required for the instrument.
Provides an estimate of the battery's operational duration.
Details the automatic power-off feature settings.
Lists the physical size of the instrument.
Specifies the weight of the instrument.
Instructions for preparing and storing the pH electrode.
Steps for taking pH measurements with the Checker Plus.
Details on visual indicators for immersion and battery status.
Step-by-step guide for calibrating the pH meter using buffer solutions.
Guidance on calibration errors and buffer solution use.
Procedure to reset the meter to default calibration settings.
Instructions for replacing the instrument's battery.
The Hanna Instruments HI 98100 Checker Plus® is a compact and user-friendly pH meter designed for quick and accurate pH measurements. It serves as an essential tool for various applications, from educational settings to laboratory and field use, where precise pH monitoring is crucial. The device is engineered for simplicity, making it accessible to both experienced users and beginners.
The Checker Plus® operates as a digital pH meter, providing a numerical display of the pH value of a sample. Its primary function is to measure the acidity or alkalinity of a liquid solution. The device utilizes an external pH electrode, the HI 1271, which is connected to the main unit. This electrode is designed to be immersed in the sample, where it detects the hydrogen ion concentration and transmits an electrical signal to the meter. The meter then converts this signal into a pH reading, which is shown on the liquid crystal display (LCD).
The meter features automatic two-point calibration, a critical function for ensuring accuracy. This means the device can be calibrated using two different pH buffer solutions, typically pH 7.01 and either pH 4.01 or pH 10.01. This process allows the meter to adjust its internal readings to match known pH standards, compensating for any drift or inaccuracies over time. The calibration process is guided by messages on the display, making it straightforward for the user.
An important aspect of its functionality is the automatic shut-off feature, which helps conserve battery life. Users can select from different auto-off times (8 minutes, 60 minutes, or off) to suit their needs. This ensures that the device does not remain on unnecessarily, extending the operational life of the battery.
The Checker Plus® is designed for ease of use, starting with its simple operation. To begin, the pH electrode, which is shipped dry, needs to be conditioned by soaking its tip in pH 7.01 buffer solution for a few hours. This prepares the electrode for accurate measurements. Once conditioned, the electrode is connected to the meter, and the device is turned on by pressing the ON/OFF button.
For measurement, the protective cap is removed from the electrode, and its tip (the bottom 4 cm or 1½") is immersed in the sample to be tested. It is crucial not to immerse the electrode beyond the maximum immersion level, as the connector must remain clean and dry to prevent damage and ensure proper function. After gentle stirring, the user waits for a stable reading to appear on the LCD. The display is clear and easy to read, showing the pH value.
Calibration is a key usage feature that ensures the reliability of measurements. To calibrate, the user presses and holds the ON/OFF button until "CAL" appears on the display. The electrode is then dipped into a pH buffer solution. The meter automatically recognizes the buffer and performs the calibration. If the first buffer confirmed is pH 7.01, the meter will prompt for a second calibration point (pH 4.01 or pH 10.01). The device indicates successful calibration with "Sto" (store) and returns to measurement mode with the calibrated buffer tags illuminated on the display. This automatic recognition and two-point calibration simplify the process, reducing potential for user error.
The device also offers a "Clear Calibration" function, allowing users to reset the meter to its default calibration settings if needed. This is accessed by entering calibration mode and then pressing and holding the ON/OFF button until "Clr" appears.
The auto-off settings are user-adjustable, providing flexibility for different measurement scenarios. By pressing and holding the ON/OFF button, users can cycle through "d08" (8 minutes), "d60" (60 minutes), or "d--" (off) to select their preferred auto-off duration.
Proper maintenance is essential for the longevity and accuracy of the Checker Plus®. The pH electrode, being the primary sensing component, requires specific care. After each use, the electrode should be rinsed with water to remove any sample residue. Crucially, it must be stored with a few drops of HI 70300 storage solution in its protective cap. The manual explicitly warns against using distilled or deionized water for storage, as this can dehydrate the electrode's sensitive glass bulb and impair its performance. Always replacing the protective cap after use is also vital to keep the electrode moist and protected.
The device provides clear indicators for maintenance needs, particularly regarding battery status. The battery symbol on the LCD will blink when the battery is low, signaling that a replacement is needed. If the battery is critically low, an "Erb" message will appear, and the meter will automatically turn off. This prevents inaccurate readings due to insufficient power.
Battery replacement is a straightforward maintenance task. The battery cover is located on the back of the meter. Users can easily replace the CR2032 lithium-ion battery, paying attention to its polarity. It is important to perform battery replacement in a safe area and dispose of old batteries according to local regulations.
Regular calibration is also a form of maintenance, ensuring the accuracy of the meter over time. The manual recommends frequent calibration for best results, especially if the electrode has been stored for a long period or if measurements require high precision. If an "Err" message appears during calibration, it suggests checking if the correct buffer solution is being used or if the electrode needs cleaning with HI 7061M cleaning solution. This diagnostic feedback helps users troubleshoot common issues.
The overall design of the Checker Plus® emphasizes durability and ease of maintenance, making it a reliable instrument for consistent pH monitoring.
General| Type | Handheld Colorimeter |
|---|---|
| Manufacturer | Hanna Instruments |
| Category | Measuring Instruments |
| Light Source | LED |
| Light Detector | Silicon Photocell |
| Environment | 0 to 50°C (32 to 122°F); RH max 95% non-condensing |
| Display | LCD |
| Auto-shut off | After 10 minutes of non-use |
| IP Rating | IP67 |
| Measurement Parameters | Free Chlorine, Total Chlorine |
| Measurement Range | Varies by model |
| Resolution | Varies by model |
| Accuracy | Varies by model |
| Battery Type | AAA alkaline |
| Model | Checker® Plus |
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