Description
The XY-DT01 30A LCD Digital Temperature Controller is a professional-grade, highly versatile thermostat designed for precise thermal regulation across a wide range of applications. Operating on a broad DC voltage range of 6V to 30V, this controller is compatible with automotive systems (12V), industrial PLC panels (24V), solar battery banks, and many other DC power sources commonly found in residential, commercial, and industrial environments .
At the heart of this module is a powerful 30A relay, capable of switching high-current loads up to 30A at 220V AC or 30A at 30V DC, making it suitable for controlling refrigerators, incubators, fermenters, greenhouse heaters, industrial pumps, and other heavy-duty equipment . Unlike smaller relay modules that require external contactors for high-power loads, the XY-DT01 can drive many devices directly.
The controller features a bright, high-definition LCD display that shows real-time temperature readings with 0.1°C precision . Four tactile buttons provide intuitive access to all programmable parameters, including set temperature, hysteresis (return difference), alarm thresholds, delay start, and temperature calibration.
A key differentiator of the XY-DT01 is its dual sensor compatibility. The module ships with a waterproof NTC 50K thermistor probe (cable length 50cm) and also supports the DS18B20 digital temperature sensor (not included) for applications requiring higher accuracy or longer cable runs . Users can select their preferred sensor type via the configuration menu.
The controller offers both Heating Mode (‘H’) and Cooling Mode (‘C’) , selectable via the settings menu. In Heating Mode, the relay activates when the measured temperature falls below the setpoint minus hysteresis, and deactivates when the setpoint is reached. Cooling Mode operates inversely, activating when temperature exceeds the setpoint plus hysteresis .
Advanced features include a programmable high-temperature alarm (ALA) with audible and visual indicators, an adjustable delay start (OPH) to prevent short-cycling of compressors or heaters, and a temperature correction offset (OFE) to calibrate the displayed temperature against a reference thermometer .
The controller is housed in a compact, industrial-grade enclosure (88 x 55 x 44mm) featuring a standard 35mm DIN rail mounting capability, allowing for easy installation inside electrical panels, control cabinets, and equipment enclosures . The screw terminal blocks provide secure, vibration-resistant connections for power input, sensor input, and relay output.
Important Operational Note: The XY-DT01 is a relay output controller and does NOT supply power to connected loads. The relay contacts are voltage-free (dry contacts), meaning the user must provide a separate power supply for the heating or cooling equipment. This design ensures maximum flexibility and safety across different voltage systems .
Whether you need to maintain precise temperatures in a reptile incubator, automate greenhouse ventilation, protect a server room from overheating, control a home brewing fermentation chamber, or manage industrial refrigeration, the XY-DT01 delivers accurate, reliable, and programmable temperature regulation in a professional, easy-to-use package.
Key Features
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Wide DC Power Input (6V-30V) – Compatible with 12V automotive, 24V industrial PLC, solar battery banks, and other DC power systems .
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30A High-Current Relay – Directly controls high-power equipment up to 30A at 220V AC or 30A at 30V DC without requiring external contactors .
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Dual Sensor Support – Works with included waterproof NTC 50K thermistor probe (50cm cable) and supports DS18B20 digital sensor (not included) for enhanced accuracy .
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Heating & Cooling Modes – Selectable ‘H’ (Heating) or ‘C’ (Cooling) mode with programmable hysteresis (return difference) for precise temperature regulation .
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0.1°C Display Precision – High-definition LCD shows temperature readings with 0.1°C resolution for accurate monitoring .
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Programmable High-Temperature Alarm – Configurable alarm threshold (ALA) triggers audible and visual alert when temperature exceeds limit .
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Adjustable Delay Start (OPH) – Prevents short-cycling of compressors, heaters, or refrigeration equipment by enforcing a minimum off-time .
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Temperature Calibration (OFE) – Offset adjustment from -10.0°C to +10.0°C allows calibration against a reference thermometer .
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DIN Rail Mountable – Standard 35mm DIN rail mounting capability for easy installation in electrical panels and control cabinets .
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Power-Down Memory – All settings are saved to non-volatile memory and retained after power loss .
Technical Parameters
Usage Guide
How It Works
The XY-DT01 continuously monitors temperature via the connected sensor (NTC or DS18B20). The user sets a target temperature (setpoint) and a hysteresis value (return difference). The controller compares the measured temperature to these values and activates or deactivates the 30A relay based on the selected mode (Heating or Cooling).
Heating Mode (‘H’) Logic:
Cooling Mode (‘C’) Logic:
Example (Incubator – Heating Mode):
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Set Temperature = 37.5°C, Hysteresis = 1.0°C
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Heater turns ON at 36.5°C, turns OFF at 37.5°C
Example (Refrigerator – Cooling Mode):
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Set Temperature = 4.0°C, Hysteresis = 2.0°C
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Compressor turns ON at 6.0°C, turns OFF at 4.0°C
Wiring Instructions
⚠️ IMPORTANT SAFETY WARNING: High voltage (110V/220V AC) is dangerous. Disconnect all power sources before wiring. Use appropriately gauged wire for your load current (minimum 10 AWG recommended for 30A loads). Mount the controller in an enclosure for permanent installations.
Step 1 – Power Connection (Terminal Block)
The controller requires a DC power source between 6V and 30V:
Suitable Power Sources:
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12V battery or automotive system
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24V industrial power supply or PLC panel
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6V-30V DC power adapter
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Solar charge controller DC output
Step 2 – Sensor Connection (2-Pin Terminal)
For DS18B20 Digital Sensor:
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Connect VCC (red) → Controller’s VCC (3.3V/5V compatible)
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Connect GND (black) → Controller’s GND
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Connect DATA (yellow/white) → Dedicated DS18B20 input (check manual)
Step 3 – Load Connection (Relay Output Terminal Block)
The relay output is voltage-free (dry contacts) . You must supply external power to your load.
Wiring Example – 220V AC Heater (NO configuration):
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Connect AC Live wire → COM terminal
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Connect AC Neutral wire → Heater neutral
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Connect Heater live → NO terminal
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When relay activates, circuit closes and heater turns ON
Wiring Example – 12V DC Cooling Fan (NO configuration):
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Connect 12V DC power supply positive → COM terminal
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Connect Fan positive → NO terminal
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Connect Fan negative → 12V power supply negative directly
Configuration and Programming
Button Functions:
Quick Settings (Short Press SET on Main Screen):
To modify: Short press SET to cycle parameters. Use UP/DOWN to adjust. Long press SET (3 seconds) or wait 6 seconds to save and exit .
Advanced Settings (Long Press SET >3 Seconds on Main Screen):
To modify: Long press SET (>3 sec) to enter advanced menu. Short press SET to cycle parameters. Use UP/DOWN to adjust. Long press SET (3 sec) or wait 6 seconds to save and exit .
Step-by-Step Installation
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Mount the Controller – Secure to DIN rail (35mm standard) or panel mount using mounting holes .
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Connect Sensor – Plug the NTC probe into the sensor terminal (polarity insensitive).
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Connect Power – Wire DC power supply (6V-30V) to VCC and GND terminals.
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Configure Parameters – Apply power and program set temperature, hysteresis, mode, etc.
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Disconnect Power – Remove DC power before wiring the load.
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Connect Load – Wire your heating/cooling equipment to COM and NO terminals with external power supply .
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Apply Power – Reconnect DC power to controller. The system will now regulate temperature automatically.
Applications
Q: What is the difference between the NTC 50K sensor and the DS18B20 sensor?
The controller supports both. To use DS18B20, purchase separately and configure in settings.
Q: Why does my load not turn on when the relay activates?
The XY-DT01 relay output is voltage-free (dry contacts) . This means the relay contacts do NOT supply power to your load. You must provide an external power source for your heating or cooling equipment .
Correct Wiring: External Power Supply Positive → COM → NO → Load → External Power Supply Negative
Q: Can I use this controller with a 220V AC heating element?
Yes. The relay is rated for 30A at 220V AC, which is sufficient for most heating elements up to 6600W (220V × 30A). Ensure your heating element’s current draw does not exceed 30A. Use appropriately gauged wire (minimum 10 AWG) for high-current connections.
Q: What is the hysteresis (return difference) setting and why is it important?
Hysteresis (displayed as “dXX.X”) is the temperature differential between relay ON and OFF points. It prevents rapid relay cycling (chattering) when temperature fluctuates near the setpoint .
Example (Heating Mode): Set Temp = 25°C, Hysteresis = 2°C
A larger hysteresis reduces relay switching frequency (longer equipment life). A smaller hysteresis provides tighter temperature control (more frequent switching).
Q: Can I use this controller for both home and business applications?
Home users: Reptile incubators, home brewing fermentation chambers, aquarium temperature control, greenhouse heaters, wine cellars, sous vide water baths, chest freezer conversion to refrigerator.
Business users: Commercial incubators and hatcheries, walk-in coolers and freezers, industrial drying ovens, pharmaceutical storage, greenhouse environmental control, printing press temperature regulation, HVAC system monitoring, food processing equipment, laboratory incubators.
Q: What is the delay start (OPH) function?
Delay start (OPH) enforces a minimum “off-time” for the relay after it deactivates. This is critical for refrigeration compressors which can be damaged by rapid short-cycling (turning on and off too quickly) .
Typical Settings:
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Refrigerator/Freezer: 5-10 minutes (OPH = 5.0)
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Heater: 0 minutes (OPH = OFF – not required)
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Air Conditioner: 3-5 minutes
When OPH is active, the relay will not turn on again until the programmed delay has elapsed, regardless of temperature readings.
Q: What is the high-temperature alarm (ALA) function?
When enabled, the ALA parameter sets a temperature threshold. If the measured temperature exceeds this threshold, the controller:
Press any button to silence the alarm. The alarm resets automatically when temperature drops below the threshold. This is useful for over-temperature protection in incubators, greenhouses, and refrigeration systems.
Q: How do I calibrate the temperature reading (OFE)?
If the displayed temperature differs from a known-accurate reference thermometer, use the OFE (offset) parameter:
Formula: Actual Temperature = Measured Temperature + OFE Value
Example: Reference thermometer reads 25.0°C, controller displays 24.5°C
Range: -10.0°C to +10.0°C (adjustable in 0.1°C increments)
Q: What power supply should I use?
The controller accepts any DC voltage from 6V to 30V . Common options:
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12V: Car battery, 12V power adapter, automotive system
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24V: Industrial PLC power supply, 24V battery bank
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9V: Common DC adapter
Current draw: The controller itself draws minimal current (<100mA). The relay coil draws additional current when active. A 1A power supply is sufficient for the controller alone.
Important: The power supply connected to VCC/GND powers ONLY the controller. Your load (heater, fan, compressor) requires a SEPARATE power supply connected through the relay COM/NO terminals.
