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The STC-3028 DC 24V Digital Temperature and Humidity Controller is an integrated dual-function environmental control module designed to automate temperature and moisture regulation in a single compact panel-mount instrument. Designed with a dual-color LED readout (Red display for Temperature, Blue display for Humidity), it gives operators clear visibility of real-time environmental conditions and setpoints at a glance.

Operating on a $24\text{V DC}$ supply, the STC-3028 contains two separate heavy-duty $10\text{A}$ relay switches. One relay manages temperature-regulating devices (such as heating rods, heat lamps, or refrigeration compressors), while the second relay independently operates humidity-control devices (such as mist makers, humidifiers, or exhaust fans). Its high-precision combined sensor probe continuously measures ambient metrics with fast response times and high accuracy, eliminating the need for two separate controller units.

Key Features and Benefits

• Simultaneous Dual Environmental Control: Controls temperature and relative humidity simultaneously using a single combined probe.

• Dual Heavy-Duty $10\text{A}$ Relay Outputs: Dedicated dry-contact relay outputs for temperature control and humidity control rated up to $10\text{A}$.

• Dual High-Contrast LED Displays: Bright red display for real-time temperature and bright blue display for real-time humidity.

• Configurable Operating Modes: Fully supports Heating vs. Cooling modes and Humidification vs. Dehumidification modes with customizable delay timers and hysteresis limits.

• Integrated Calibration & Alarm: Built-in temperature and humidity calibration offset settings plus high/low limit audible buzzer alarms.

• Durable Panel Mount Housing: Compact ABS flame-retardant housing designed for easy drop-in installation into control panels and enclosures.

Technical Specifications

Wiring & Terminal Diagram

1. Terminal Connections:

2. Relay Control Logic:

  TEMPERATURE CONTROL (Relay 1):
  - Heating Mode: Set Start Temp < Stop Temp  --> Relay ON when Temp drops below Start Temp
  - Cooling Mode: Set Start Temp > Stop Temp  --> Relay ON when Temp rises above Start Temp

  HUMIDITY CONTROL (Relay 2):
  - Humidify Mode: Set Start Humidity < Stop Humidity  --> Relay ON when Humidity drops below Start Humidity
  - Dehumidify Mode: Set Start Humidity > Stop Humidity  --> Relay ON when Humidity rises above Start Humidity

Applications

• Poultry Egg Incubators & Brooders: Precise simultaneous temperature and humidity control for optimal hatching rates.

• Greenhouses & Hydroponics: Automating grow lamps, mister systems, and exhaust fans for microclimate management.

• Mushroom Cultivation Chambers: Maintaining strict humidity levels ($>85\%$) alongside temperature regulation.

• Industrial Control Cabinets: Managing cooling fans and anti-condensation heaters inside $24\text{V}$ automation enclosures.

Package Includes

• 1 x STC-3028 DC 24V Dual Display Temperature and Humidity Controller Unit

• 1 x Integrated $1\text{M}$ Combination Temperature/Humidity Sensor Probe

• 2 x Panel Mounting Clips

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Anti-static ESD protective packaging for safe transit