Digital Thermostat Module Model XH-W1219

The XH-W1219 DC 12V dual-display digital thermostat module is a PCB-based precision temperature control switch with a waterproof NTC sensor, relay output, 0.1°C high accuracy, used to auto switch heating/cooling equipment within -50℃~110℃ temperature range.

Technical Specifications

• Description: Digital Thermostat Module Model XH-W1219
• Temperature Measuring Range: -50℃ ~ 110℃
• Temperature Control Range: -50℃ ~ 110℃
• Control Mode: Bitwise control
• Resolution: 0.1℃ within -19.9~99.9℃; 1℃ for other temperature ranges
• Power Supply: DC12V (Power consumption <100mA)
• Probe: NTC10K/B3950 temperature sensor, Cable length L=0.5m
• Measurement Accuracy: 0.1℃
• Control Accuracy: 0.1℃
• Output Type: Relay output, Max 10A
• Display Window: 0.28-inch triple-digit dual-color digital tube
• Overall Dimensions: 60x43x16mm
• Other Parameters: Equipped with reverse connection protection; M3 mounting holes, probe replaceable

Parameter Setting Table and Code meanings

Code	Parameter Description	Setting Range	Factory Default	Unit
P0	Working Mode	C/H	C	—
P1	Temperature Hysteresis	0.1~30	2	℃
P2	Temperature Calibration	-10.0~+10.0	0	℃
P3	Output Delay	0~10	0	Minute
P4	High Temperature Alarm	-50~110	110	℃

Restore Factory Settings: Press and hold the [+] & [-] keys simultaneously for 3 seconds.

P0 Working Mode

• C: Cooling Mode
• H: Heating Mode

P1 Hysteresis Setting

For example: P1=5

• C: Cooling Mode

When measured temperature rises to the set stop value, the relay opens;  temperature rise 5℃ , then the relay closes again .

• H: Heating Mode

When measured temperature drops to the set stop value, the relay opens. temperature drops 5℃, then the relay closes again.

P2 Temperature Calibration

Use this function if there is deviation between detected temperature and actual temperature.

Actual Temperature = Measured Value + Calibration Value

Example: The thermostat reads 25.6℃ while the true temperature is 25.8℃. Then set P2=0.2.

Calculation: 25.6 + 0.2 = 25.8

P3 Startup Delay

Designed for compressor refrigeration systems. Mandatory setting for refrigerators & freezers.

Typical setting: 3~6 minutes, depending on compressor backpressure. Skip this parameter if you do not control a compressor or function of delay is unnecessary.

P4 High Temperature Alarm

Set high temperature threshold. Screen flashes to trigger alarm when detected temperature exceeds this value.

How to wire XH-W1219?

How to set? (Operation Instructions)

1. After power-on: Screen displays 888 888, then switches to normal temperature display.
2. Short-time press SET: Green digital tube flashes. Adjust stop temperature with press [+] / [-] keys.
3. Holding-press SET for 3s: Enter code displaying status, adjust parameter with press [+] / [-] keys.
4. Short-time press SET: Green digital tube flashes. Adjust parameter value with [+] / [-] keys.
5. After setup: holding-press SET for 3s OR wait 5s to return to normal display.

Heating Mode Example

Target: Stop heating at 40℃; restart heating when temperature falls to 35℃

Stop temperature=40℃   P0 = H    P1 = 5

Operation: Under normal temperature display, holding- press SET to enter main menu → set P0=H, P1=5 → wait 5s to exit. Short-time press SET, Green digital tube flashes , set stop temperature = 40℃.

Cooling Mode Example

Target: Start cooling fan above 35℃; stop fan when temperature drops to 32℃

Stop temperature=32℃   P0 = C   P1 = 3

Operation: Under normal temperature display, holding- press SET to enter main menu → set P0=C, P1=3 → wait 5s to exit. Short-time press SET, Green digital tube flashes , set stop temperature = 32℃.

Product Features

1. Dual-color dual LED display: Simultaneously shows real-time detected temperature and preset target temperature for instant reading.
2. 0.1℃ ultra-precise temperature control: Fine hysteresis adjustment avoids frequent relay on-off flicker and prolongs service life.
3. Heating & Cooling dual mode switchable: One module supports both constant heating and automatic cooling control modes.
4. Multi-protection programmable functions: Compressor startup delay, temperature deviation calibration, overheat alarm to prevent equipment burnout.
5. 10A high-power relay output: Directly drives small heaters, fans, refrigeration compressors without extra intermediate relays.
6. Waterproof NTC temperature probe: Adaptable to humid, liquid, dusty installation environments with stable signal collection.
7. Compact PCB structure: Tiny footprint easy to embed into DIY equipment, cabinets, enclosures and custom devices.

Application Scenarios

1. Refrigerator & Freezer Temperature Control: Automatically cut off compressors when reaching set low temperature, use delay function to protect refrigeration compressors from frequent start damage.
2. Egg Incubator Constant Temperature Management: Lock stable incubation temperature within ±0.1℃ to guarantee hatching success rate for poultry eggs.
3. Greenhouse & Hydroponic Grow Tent Thermal Regulation: Control heating pads or exhaust fans to maintain fixed ambient temperature for plant cultivation.
4. Aquarium Water Temperature Monitoring & Adjustment: Cooperate with aquarium heaters/chillers to stabilize water temperature for fish and aquatic organisms.
5. Industrial Equipment Cabinet Heat Dissipation Control: Trigger cooling fans once internal cabinet temperature exceeds threshold to prevent circuit overheating failure.

FAQs

QC Inspection Items for XH-W1219 Digital Thermostat

The quality of XH-W1219 Digital Thermostats from Smartclima is assured. All items follow the below internal quality inspection to assure that you get the perfect products:

1. IQC (Incoming Material Inspection)

• NTC probe: resistance accuracy, B-value, tensile strength, insulation
• Relay: pull-in/release voltage, contact resistance, 10A load lifespan
• Electronic components (resistor/capacitor/IC): parameter tolerance, appearance integrity
• PCB: circuit continuity, insulation, solder mask quality
• Display tube: segment integrity, brightness uniformity
• Housing, terminals & wires: dimensional tolerance, crimp firmness, voltage resistance

2. IPQC (In-process Quality Control)

• SMT soldering: no cold solder, bridging, component tombstoning
• Manual welding & assembly: stable solder joints, smooth keystroke, tight assembly
• ESD protection verification at workstations

3. FQC (Finished Product 100% Test)

• Display & keys: normal dual-screen display, responsive button operation
• Temperature precision: calibration via constant temperature bath (target accuracy ≤0.1℃)
• Control logic: heating/cooling switching, temperature hysteresis, over-temperature flashing alarm
• Electrical performance: working current, 250V/10A full-load operation, temperature rise test
• Safety test: dielectric withstand voltage & insulation resistance
• Powered aging test (4–8 hours): eliminate intermittent failures
• Visual check: scratch-free housing, clear printing

4. OQC (Outgoing Quality Control)

• Random recheck of core functions
• Complete package & accessories
• Package drop resistance test

5. Periodic Reliability Sampling Test

• High/low temperature environmental test
• Relay switching life test
• Wire bending durability & damp-heat aging test