The PH8500 Portable pH Meter is a microprocessor-based instrument designed for general water solution applications, including water treatment, environmental monitoring, pools and spas, hydroponics, aquaculture, education, and beverage making. It is particularly well-suited for field use due to its portable design and robust features.
Function Description:
The meter primarily measures pH, mV (ORP), and temperature. It incorporates advanced electronics and sensor technology, along with sophisticated software, to provide accurate and reliable measurements. Key functions include automatic calibration, automatic temperature compensation (ATC), function setup, self-diagnostics, and due calibration reminders. It also features GLP (Good Laboratory Practice) compliance, a clock display, manual and automatic timing storage, and a USB port for data transfer. The meter's digital filter enhances measurement speed and accuracy, and it provides a reading stability display to ensure reliable results. The device is dustproof and waterproof, meeting the IP57 rating, making it suitable for various environmental conditions.
Important Technical Specifications:
- pH Measurement:
- Measuring Range: -2.00 to 16.00 pH
- Resolution: 0.1/0.01 pH
- Accuracy: ±0.01 pH ±1 digit
- Temperature Compensation: 0 to 100 °C (manual or automatic)
- mV Measurement:
- Measuring Range: ±1,999 mV
- Resolution: ±200 mV: 0.1 mV; others: 1 mV
- Accuracy: ±0.1% F.S ±1 digit
- Temperature Measurement:
- Measuring Range: -10 to 110 °C
- Resolution: 0.1 °C
- Accuracy: ±0.5 °C ±1 digit
- Data Storage: 500 groups, including serial number, date, time, measuring value, measuring unit, and temperature value.
- Output: USB
- Power: 3 AA batteries (1.5V × 3)
- IP Rating: IP57 waterproof and dustproof
- Dimensions & Weight:
- Meter: 86 × 196 × 33 mm / 335 g
- Portable Case: 330 × 270 × 82 mm / 1.3 kg
Usage Features:
- LCD Display: The LCD shows measuring mode icons (pH, mV, SAL, COND, TDS), measurement readings, timing storage icon, date and time, units of measurement, temperature units, units of calibration value, standard calibration value, storage and recall icons (M+ for store, RM for recall), temperature value, temperature compensation icons (ATC for automatic, MTC for manual), calibration guide icon, USB icon, stability icon, low battery icon, and auto-hold icon.
- Keypad Functions:
- Power On/Off: Short press the power key to turn on; long press for 2 seconds to turn off in measurement mode.
- Backlight: Short press the power key to turn on/off the backlight.
- Mode Selection: Short press the MODE key to switch between pH and mV measurement.
- Calibration: Short press the CAL/MEAS key to enter calibration mode.
- Parameter Setup: Short press the SETUP/ENTER key to enter the parameter setup main menu. In calibration or setup mode, this key is used to make calibrations or select programs.
- Data Storage/Recall: Short press M+ to store data; short press RM to recall data. Long press M+ or RM to enter manual temperature compensation mode or adjust temperature values.
- Navigation: M+ and RM keys are used to change serial numbers in recall mode or navigate through main and sub-menus in parameter setup.
- Display Modes:
- Reading Stability: A smiley icon appears on the LCD when the reading is stable. Users can select from "Normal," "High" (longer stability time), or "Low" (shorter stability time) criteria.
- Automatic Lock-up: When enabled, the meter automatically locks the reading after 10 seconds of stability, displaying a HOLD icon. Press CAL/MEAS to release.
- Data Management:
- Manual Storage: Press M+ when the reading is stable to store data.
- Automatic Timing Storage: Set a storage interval (e.g., 3 minutes) in parameter P3.3. The meter will automatically store readings at the set interval.
- Recall Data: Press RM to recall stored data.
- Clear Data: Clear all stored values via parameter P3.6.
- Auto Power-off: The meter automatically powers off after 20 minutes of inactivity. The time can be adjusted in parameter P3.7.
- Manual Temperature Compensation (MTC): If no temperature probe is connected, users can manually adjust the temperature value using the M+ and RM keys.
- pH Calibration:
- Standard Buffer Solutions: Supports USA series (1.68, 4.00, 7.00, 10.01, 12.45 pH) and NIST series (1.68, 4.01, 6.86, 9.18, 12.45 pH).
- Calibration Points: Can perform 1-3 point automatic calibrations. The first point must be 7.00 pH (or 6.86 pH).
- Calibration Guide: Provides automatic checking and guidance during calibration.
- Customer-defined Calibration: Allows users to define their own calibration solutions.
- Calibration Frequency: Depends on sample type, electrode performance, and required accuracy. High accuracy measurements require calibration before each use, while general accuracy allows for weekly calibration. Re-calibration is necessary for new probes, after long periods of disuse, or after measuring extreme pH solutions.
- Self-diagnosis: The meter provides error codes (Er1-Er5) for issues like wrong buffer solution, unstable readings, or electrode performance errors, with troubleshooting suggestions.
- mV (ORP) Measurement: Connects to a 301Pt-C ORP electrode (sold separately). ORP measurement does not require calibration, but ORP standard solutions can be used to test electrode quality.
- USB Communication: Connects to a computer via USB cable using "PC-Link" software (Windows-based). Allows downloading of stored data, real-time data storage to the computer, and exporting data to Microsoft Excel.
Maintenance Features:
- pH Electrode Maintenance:
- Daily Maintenance: Store the electrode in the supplied 3M KCL soaking solution (SKU: AI1107) to maintain activation. Rinse with distilled water before and after measurements. Do not store in distilled water, protein solution, or acid fluoride solution.
- Calibration Buffer Solution: Refresh standard buffer solutions frequently, especially after heavy use, to ensure calibration accuracy.
- Protect Glass Bulb: Avoid contact with hard surfaces to prevent scratches or cracks. Wash with distilled water before and after use; do not wipe with tissue.
- Renew Glass Bulb: For aged electrodes, submerge in 0.1 mol/L hydrochloric acid for 24 hours, then in soaking solution for 24 hours. For serious passivation, use 4% HF for 3-5 seconds.
- Cleaning Contaminated Glass Bulb and Junction: Specific cleaning solutions are recommended for different contaminants (e.g., Apera Electrode Cleaning Solution for general tough contaminants and proteinic sediment, dilute detergent for organic lipid, dilute alcohol/acetone/ether for resin macromolecule, dilute bleacher/peroxide for paints). Caution is advised with certain solvents that can damage the polycarbonate housing.
- ORP Electrode Maintenance:
- Cleaning and Activation: For inorganic pollutants, submerge in 0.1 mol/L dilute hydrochloric acid for 30 minutes, then in soaking solution for 6 hours. For organic/lipid pollutants, clean with detergent, then soak in soaking solution for 6 hours. For heavily polluted platinum surfaces with oxidation film, polish with toothpaste, then soak.
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