1. Introduction
The TEKCOPLUS TK402PLUS pH Controller is designed for precise and dependable pH measurement and control in various aqueous solutions. This device is ideal for applications such as hydroponic systems, aquariums, and other water quality management scenarios. It features automatic temperature compensation, dual relay outputs for pH UP and pH DOWN dosing pumps, and a clear LCD for data display and trend tracking.
Image 1.1: Overview of the TEKCOPLUS TK402PLUS pH Controller system, including the main unit, pH probe, and dual dosing pumps.
2. Product Features
- Digital pH Control: Provides accurate and reliable pH measurement and control.
- Automatic Temperature Compensation (ATC): High-precision pH sensor with ATC ensures stable readings regardless of temperature fluctuations. Temperature units are switchable (°C/°F).
- Data Display Function: LCD displays current pH, temperature, and allows tracking of Max/Min/Avg data. Includes a chart display for pH and temperature trends over the past 3 days.
- Dual Relay Output: Features two relay outputs for automatic switching between pH UP and pH DOWN dosing modes. Designed for plug-and-play operation with external dosing pumps.
- Automatic pH Adjustment: Automatically introduces pH-adjusting substances to maintain the desired pH level.
Image 2.1: Visual representation of the controller's main features.
3. Safety Information
- Always ensure the device is powered off before connecting or disconnecting any components.
- Do not immerse the entire pH probe in liquid. Only the sensing tip should be submerged.
- Keep the device and its components away from direct sunlight, extreme temperatures, and corrosive environments.
- Handle the pH probe with care to avoid damage to the sensitive glass bulb.
- Ensure all electrical connections are secure and dry.
Image 3.1: Correct pH probe placement and immersion depth.
4. Setup Instructions
- Unpack Components: Carefully remove the pH controller main unit, pH probe, and any included accessories from the packaging.
- Mount the Controller: Choose a suitable location for the main controller unit, ensuring it is protected from splashes and direct moisture. Use the integrated mounting holes on the back of the unit to secure it.
- Connect the pH Probe: Connect the pH probe cable to the designated BNC connector on the main controller unit. Ensure the connection is firm.
- Position the pH Probe: Place the pH probe in the liquid to be monitored. Ensure only the sensing tip is submerged, and the liquid level does not exceed the fixed holder. The probe should be used upright.
- Connect Dosing Pumps (Optional): If using external dosing pumps for pH UP and pH DOWN, connect them to the respective relay output sockets on the controller.
- Power On: Connect the power adapter to the controller and then plug it into a suitable power outlet (100-240V AC, 50/60Hz). The unit will power on and display current readings.
Image 4.1: Rear view of the controller showing mounting points.
5. Operating Instructions
5.1. Calibration
Accurate calibration is crucial for reliable pH readings. Refer to the specific calibration instructions provided in the full product manual for detailed steps. Typically, calibration involves using standard buffer solutions (e.g., pH 4.0, pH 7.0, pH 9.18) and following the on-screen prompts.
5.2. Setting Control Parameters
The controller allows you to set various parameters to manage your pH levels. Use the MENU, UP/DOWN, and ENTER buttons to navigate and adjust settings.
| Setting | Factory Default | Range |
|---|---|---|
| CENTER | 6.0 | 4.5 ~ 8.5 |
| ZONE | 0.2 | 0.2 ~ 1.0 |
| DOSING TIME | 10 seconds | 3 ~ 100 seconds |
| MIX TIME | 4 minutes | 1 ~ 20 minutes |
| Calibrate 7.0 | 7.0 | Fixed at 7.0 |
| Calibrate 4.0 | 4.0 | Fixed at 4.0 |
| High pH limit | 8.5 | 6.0 ~ 9.5pH |
| Low pH limit | 4.5 | 3.5 ~ 7.0 pH |
| Temperature | °C | °C or °F |
CENTER: Sets the target pH value. The controller will aim to maintain the pH around this value.
ZONE: Defines the acceptable deviation from the CENTER pH. If the pH falls outside the CENTER ± ZONE range, dosing will be initiated.
DOSING TIME: Sets the duration for which the dosing pump will operate during a single dosing cycle.
MIX TIME: Sets the delay after a dosing cycle before the next pH reading is taken, allowing the solution to mix.
5.3. Monitoring Data
The LCD provides real-time pH and temperature readings. Press the HOLD/HOME button to view Max/Min/Avg data. Use the arrow buttons to navigate the 3-day trend chart for pH and temperature.
Image 5.1: Detailed view of the LCD display.
6. Maintenance
- pH Probe Cleaning: Regularly clean the pH probe to remove any buildup that may affect accuracy. Use a soft brush and distilled water, or a specialized probe cleaning solution.
- pH Probe Storage: When not in use, store the pH probe in a storage solution or pH 4 buffer solution to keep the glass bulb hydrated. Do not store in distilled water.
- Recalibration: Recalibrate the pH probe regularly, especially after cleaning, extended storage, or if readings appear inconsistent. The frequency depends on usage and application.
- General Cleaning: Wipe the main controller unit with a soft, damp cloth. Do not use abrasive cleaners or immerse the unit in water.
7. Troubleshooting
The controller features an error table to assist with basic troubleshooting:
| Error Code | Description | Possible Solution |
|---|---|---|
| E1 | pH Sensor Connect Error | Check pH probe connection. Ensure it is securely fastened. |
| E2 | pH Value Exceed High/Low Limit | The measured pH is outside the configurable high/low pH limits. Check solution, recalibrate probe, or adjust limits. |
| E3 | Dosing Cycles Exceed Max Dose Limit | The controller has attempted to dose too many times without reaching the target pH. Check dosing pump function, solution concentration, or probe accuracy. |
| E4 | Opposite Reaction to Dosing | pH is moving in the wrong direction after dosing. Verify pH UP/DOWN solutions are connected to the correct pumps/relays. |
| E5 | pH Sensor Content (pH Do Not Change) | The pH reading is not changing. Check if the probe is properly immersed, clean, and functioning. Recalibrate or replace if necessary. |
If issues persist after attempting these solutions, please contact customer support.
8. Specifications
| Parameter | Value |
|---|---|
| Model Number | TK402PLUS |
| Display Type | LCD |
| Adjustable pH Control Range | 4.5 ~ 8.5 pH |
| pH Resolution | 0.1 |
| pH Accuracy | ±0.2 pH |
| Temperature Accuracy | ±1°C (1°F) |
| Operating Temperature | 1°C (Minimum, typical range wider) |
| Input Power | 100~240V AC, 50/60Hz |
| Maximum Amperage | Max. 10A, 100~240VAC |
| Input Power Cable Length | 150cm / 5ft |
| Output Power Cable Length | 100cm / 3.2ft |
| Product Dimensions | 195 x 120 x 43mm (7.7 x 4.7 x 1.7 inches) |
| Item Weight | 8 ounces |
| Batteries Required | No |
| Included Components | pH Controller (main unit with socket) |
Image 8.1: Summary of product specifications.
9. Warranty and Support
For warranty information, please refer to the documentation included with your purchase or contact the seller directly. TEKCOPLUS products typically come with a manufacturer's warranty covering defects in materials and workmanship.
If you require technical assistance, troubleshooting beyond this manual, or have questions about your TEKCOPLUS TK402PLUS pH Controller, please contact TEKCOPLUS customer support through their official website or the retailer where the product was purchased.
