1. Product Overview
The CERTEON C402/C902 is a digital PID temperature controller designed for precise temperature regulation in industrial and commercial applications. It features universal signal input, dual digital display for process value (PV) and set value (SV), and configurable output options including relay, solid-state relay (SSR), analog output, and RS485 communication. The controller is suitable for panel mounting and supports multiple housing sizes to meet diverse installation requirements.
Figure 1: CERTEON C402 Temperature Controller highlighting dimensions and features.
2. Setup and Installation
2.1. Unpacking
Carefully unpack the contents. The package should include:
- Temperature controller unit
- Mounting brackets
Note: Sensor and wiring accessories are typically supplied separately by the seller.
2.2. Panel Mounting
Install the controller into the panel cutout according to the specified dimensions for your model:
| Model | Panel Size | Cutout Size |
|---|---|---|
| C102 | 50 × 50 mm | 45 × 45 mm |
| C702 | 72 × 72 mm | 66 × 66 mm |
| C902 | 96 × 96 mm | 92 × 92 mm |
| C402 | 48 × 96 mm | 45 × 92 mm |
2.3. Wiring
Ensure the supply voltage matches 180-240 VAC, 50 Hz before connecting. Connect the power supply terminals, sensor input terminals, and output terminals according to the specific wiring diagram for your model and desired output configuration. Verify correct wiring of thermocouple polarity or other selected input signals.
Figure 2: M402/702/902 Wiring Diagram (AC Contactor and Solid State Relay).
- 8, 9: Power supply (220VAC)
- 3, 4: Solid-state output
- 10, 11: Alarm point normally open output
- 12, 13: Relay normally open output
- 13, 14: Relay normally closed output
- 5, 6, 7: RTD input
- 5, 6: Thermocouple input
Figure 3: Detailed Solid State Relay (SSR) Wiring Diagram. Connects N, L, RTD/Thermocouple, and Heating Tube via a terminal block and SSR.
Figure 4: Detailed AC Contactor Wiring Diagram. Connects N, L, RTD/Thermocouple, and Heating Tube via a terminal block and AC Contactor.
3. Operating Instructions
3.1. Power On
Once wired correctly, power on the controller. The display will show the current process value (PV) on the upper display and the set value (SV) on the lower display.
3.2. Setting Temperature
Set the desired temperature using the front panel keys (Up/Down arrows).
3.3. Configuration
Access the parameter setting menu to configure the input type, control mode (e.g., PID), alarm parameters, and output type according to your application requirements. You can select PID parameters manually or use the auto-tuning function if available.
3.4. Display Reading
- Upper Display (PV): Indicates the measured temperature value.
- Lower Display (SV): Indicates the configured set temperature.
- Indicator Lights: Show output and alarm status.
3.5. Panel Analysis
Figure 5: Front Panel Layout and Functionality.
- Primary Display (PV): Displays measured values and various prompts.
- Secondary Display (SV): Displays set values and various parameter values.
- Function Key (SET): Main and submenu entry key; parameter modification and confirmation key.
- Increase Key (▲): Adjusts values upward; manual mode entry key; menu and parameter switching key.
- Decrease Key (▼): Adjusts values downward; self-tuning mode entry key; menu and parameter switching key.
- R/S Key: Left/right navigation key.
- Action Indicators: OUT1 (Main Control Output 1); AT (Auto-Tuning); AL1 (Alarm 1); AL2 (Alarm 2); OUT2 (Output 2); A/M (Manual/Automatic).
4. Maintenance
4.1. Storage
Store the device in a dry, ventilated environment away from direct sunlight. Avoid extreme temperatures. Recommended storage temperature is typically between -20°C to 60°C.
4.2. Cleaning
Clean the front panel using a soft, dry cloth. Do not use aggressive solvents, abrasive materials, or excessive moisture, as these can damage the display or housing.
4.3. Inspection
Periodically inspect wiring terminals to ensure secure connections. Check for any signs of corrosion or loose wires, especially in industrial environments.
5. Troubleshooting
If you encounter issues, refer to the following common problems and solutions:
- No Power: Check the power supply voltage (180-240 VAC) and ensure all power connections are secure. Verify the power source is active.
- Incorrect Temperature Reading: Confirm the sensor type configured in the controller matches the connected sensor (e.g., K-type thermocouple, Pt100 RTD). Check sensor wiring for correct polarity and secure connections. Ensure the sensor is properly installed in the measurement area.
- No Output Control: Verify the output type is correctly configured (Relay, SSR, etc.). Check alarm settings and ensure the set temperature is within the operational range. Inspect output wiring for proper connection to the load. Remember that 0-10V and SSR outputs cannot be used simultaneously.
- Unstable Control: If temperature fluctuates excessively, try using the auto-tuning function to optimize PID parameters. Ensure the sensor is not subject to rapid temperature changes or excessive electrical noise.
6. Specifications
| Parameter | Specification |
|---|---|
| Brand | CERTEON |
| Product Name | Temperature Controller |
| Model | C102, C702, C902, C402 (various panel/cutout sizes) |
| Alarm Range | Full range adjustable |
| Rated Voltage | 180V-240VAC 50Hz |
| Resolution | 1°C, 0.1°C (adjustable) |
| Power Consumption | ≤5VA |
| Measurement Accuracy | ±0.5%FS |
| Relay Outputs | Two relay outputs |
| Optional Outputs | Relay/SSR/Relay+SSR/4-20MA/RS485/0-10V output |
| Temperature Range | 0-400°C (Max adjustable to 1370°C) |
| Memory Protection | Non-volatile memory |
| Material | Front panel made of organic glass and polymer material |
7. User Tips
- High Accuracy Applications: This controller can maintain ±0.2°C accuracy, making it suitable for critical processes like electric furnaces.
- Smooth SSR Operation: The SSR output switches smoothly with minimal delay, beneficial for applications requiring precise and rapid control.
- Easy Monitoring: The large screen display simplifies parameter adjustment and monitoring, even from a distance.
- Seamless Integration: Utilize the integrated analog and RS485 outputs for smooth communication and data exchange with PLC systems.
8. Frequently Asked Questions (FAQ)
- Q1: Can the temperature range be adjusted beyond 400°C?
- A1: Yes, the maximum adjustable range can reach up to 1370°C, depending on the sensor type used.
- Q2: What panel sizes are available for this controller?
- A2: The available sizes are 50×50mm, 72×72mm, 96×96mm, and 48×96mm.
- Q3: How does the dual display work?
- A3: The PV (Process Value) display shows the measured temperature, while the SV (Set Value) display shows the configured set temperature, providing real-time monitoring.
- Q4: Are communication outputs available?
- A4: Yes, optional outputs include 4-20mA analog output, RS485 communication, and 0-10V analog output.
9. Safety Precautions
- Qualified Personnel: Ensure installation and maintenance are performed by qualified personnel.
- Power Disconnection: Always disconnect power before wiring, installation, or maintenance to prevent electric shock.
- Sensor Compatibility: Use appropriate thermocouples or input sensors compatible with the configured input type and temperature range.
- Voltage and Temperature Limits: Do not exceed the specified voltage and temperature range of the device.
- Environmental Conditions: Avoid installation in environments with excessive humidity, corrosive gases, or strong electromagnetic interference.
- Physical Damage: Do not operate the device with damaged housing or exposed terminals.
- Safety-Limiting: This controller is not a safety-limiting device. Additional independent safety protection must be installed for critical heating systems.
- Children: Keep out of reach of children.
- Disposal: Follow WEEE directives for proper disposal of electronic waste.
10. Support and Contact
For technical consultations, bulk orders, or customized products, please contact us:
- WhatsApp: +86 13311678550
- Email: miazhao008@gmali.com
Figure 6: Contact details for support and inquiries.