Electronic Digital Display Microcomputer Temperature Controller STC-1000

1. Introduction

The STC-1000 is a versatile electronic digital display microcomputer temperature controller designed for precise temperature management. It features a clear digital display and is capable of controlling both heating and cooling devices, making it suitable for a wide range of applications such as aquariums, incubators, refrigerators, and other temperature-controlled environments. This manual provides essential information for the safe and effective use of your STC-1000 controller.

2. Product Overview

Figure 1: Front view of the STC-1000 Temperature Controller, showing the digital display and control buttons.

Front Panel Components:

• Digital Display: Shows current temperature and various parameter settings.
• 'S' Button (Set): Used to enter and confirm parameter settings.
• Up Arrow Button: Used to increase values or navigate menus.
• Down Arrow Button: Used to decrease values or navigate menus.
• Power Button: Turns the device on or off.
• 'Cool' Indicator: Illuminates when the cooling output is active.
• 'Heat' Indicator: Illuminates when the heating output is active.

Rear Panel Terminals:

The rear panel typically features screw terminals for electrical connections. While specific labeling may vary, common connections include:

• Power Input: For connecting the main power supply to the controller. (Note: Verify the correct operating voltage for your specific unit, as it is not provided in the general product data. Common voltages include 12V, 24V, 110V, or 220V AC/DC.)
• Temperature Sensor Input: For connecting the NTC temperature sensor.
• Heating Output: Relay contacts for connecting your heating device.
• Cooling Output: Relay contacts for connecting your cooling device.

3. Specifications

4. Setup and Installation

4.1 Safety Precautions

• Always disconnect power before installation or maintenance.
• Ensure all wiring is done by a qualified professional if you are unsure.
• Verify the correct operating voltage of the STC-1000 before connecting power.
• Do not expose the device to water or excessive humidity.

4.2 Mounting

The STC-1000 is designed for panel mounting. Cut an appropriately sized opening in your control panel and secure the controller using the provided clips or mounting hardware.

4.3 Wiring

Refer to the wiring diagram typically found on the side or top of the device, or in specific product documentation. A general wiring scheme includes:

1. Power Supply: Connect the main power source (e.g., 12V/24V/110V/220V AC/DC) to the designated power input terminals.
2. Temperature Sensor: Connect the NTC temperature sensor to its dedicated input terminals. Ensure the sensor is placed in the environment where temperature needs to be measured.
3. Heating Device: Connect your heating equipment (e.g., heater, heating lamp) to the heating output relay terminals.
4. Cooling Device: Connect your cooling equipment (e.g., fan, compressor) to the cooling output relay terminals.

Important: Double-check all connections for correct polarity and secure fastening to prevent damage or malfunction.

5. Operating Instructions

5.1 Power On/Off

• Press the Power button (⏻) to turn the controller on or off.

5.2 Viewing Current Temperature

• When powered on, the digital display will show the current measured temperature.

5.3 Setting the Target Temperature (Set Point)

1. Press the 'S' button. The display will flash the current set temperature.
2. Use the Up Arrow (▲) or Down Arrow (▼) buttons to adjust the target temperature to your desired value.
3. Press the 'S' button again to confirm the setting and exit the setting mode. The display will return to showing the current temperature.

5.4 Automatic Heating/Cooling Control

The STC-1000 automatically switches between heating and cooling modes based on the set temperature and a pre-configured differential (hysteresis). If the measured temperature falls below the set point, the heating output will activate (Heat indicator on). If the measured temperature rises above the set point, the cooling output will activate (Cool indicator on).

6. Maintenance

• Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Sensor Care: Ensure the temperature sensor is clean and free from debris. Avoid bending or damaging the sensor cable.
• Connections: Periodically check all electrical connections to ensure they are secure.

7. Troubleshooting

• Display is blank: Check power supply connections. Ensure the device is turned on.
• Incorrect temperature reading: Check if the sensor is properly connected and not damaged. Ensure the sensor is placed correctly in the environment.
• Heating/Cooling output not activating: Verify the set temperature and current temperature. Check wiring to the heating/cooling device. Ensure the device's power supply is adequate.
• Display shows 'HHH' or 'LLL': This usually indicates a sensor error. 'HHH' often means the temperature is too high or the sensor is open-circuited. 'LLL' often means the temperature is too low or the sensor is short-circuited. Check sensor connection and integrity.

8. User Tips

• Verify Accuracy: For critical applications, it is recommended to verify the STC-1000's temperature readings against a known accurate thermometer.
• Sensor Placement: Position the temperature sensor away from direct heat sources or drafts to ensure accurate ambient temperature measurement.
• Ventilation: Ensure adequate ventilation around the controller to prevent overheating, especially if mounted in an enclosed space.

9. Warranty and Support

This product comes with a 6-month warranty from the date of purchase, covering manufacturing defects. If you encounter any questions or require assistance with your STC-1000 temperature controller, please contact customer support. We aim to respond to all inquiries within 24 hours.