ZFX-13001 12V DC High Precision Capacitive Humidity Controller

🔍 Overview
The ZFX-13001 is a digital humidity control system (humidistat) designed to:
Measure relative humidity using a capacitive sensor
Automatically control external devices (humidifier/dehumidifier) via a relay output
👉 It is not just a sensor — it is a closed-loop control device (measurement + decision + switching).
⚙️ Working Principle
1. Capacitive Humidity Sensing
Uses a polymer capacitive humidity sensor
Moisture absorption changes dielectric constant → changes capacitance
Internal circuitry converts this into digital humidity value
👉 Provides stable and accurate RH measurement over a wide range.
2. Control Logic (Humidistat Operation)
The controller compares:
Measured humidity (RH)
User-set threshold (setpoint)
Then controls output via relay:
Dehumidification Mode (H)
If RH > setpoint → relay ON
If RH drops to threshold → relay OFF
Humidification Mode (C)
If RH < setpoint → relay ON
If RH reaches threshold → relay OFF
👉 Includes hysteresis (difference value) to prevent rapid switching.
📊 Measurement Characteristics
Humidity range: 1% to 99% RH
Accuracy:
Typical: ±2% RH
Some variants: ±1% RH
Control resolution: 1% RH
👉 Wide range suitable for both dry and humid environments.
⚡ Electrical Characteristics
Supply voltage: 12V DC (also variants: 24V, 110V, 220V)
Relay output capacity: up to 10A load
Power consumption: ≤3W
👉 Can directly control:
Humidifiers
Dehumidifiers
Fans or exhaust systems
🔗 Control & Interface
Display & Input
LED digital display for:
Current humidity
Set values
Buttons for:
Setpoint
Mode selection
Hysteresis adjustment
👉 Provides real-time monitoring + configuration.
Sensor Interface
External probe-type humidity sensor with cable
Allows remote measurement placement
🧠 Internal Features
✔ Dual Mode Operation
Humidification mode
Dehumidification mode
✔ Hysteresis Control
Prevents relay chatter (rapid ON/OFF switching)
Improves system stability
✔ Power-Off Memory
Stores settings even after power loss
✔ Anti-Interference Logic
Reduces false triggering due to noise or fluctuations
🔄 Operating Behavior
✔ Automatic Control Loop
Measure humidity
Compare with setpoint
Activate relay
Maintain humidity within range
👉 Fully autonomous operation after configuration.
✔ Response Characteristics
Moderate response speed (depends on airflow around probe)
Stable long-term operation
🌡️ Environmental Characteristics
Typical operating temperature: 0°C to 70°C
Works in non-condensing humidity environments
👉 Sensor performance depends on:
Airflow
Temperature stability
⚠️ Limitations
Measures relative humidity only (not absolute moisture content)
Accuracy affected by:
Condensation
Poor airflow
Not suitable for:
Highly corrosive environments
Relay-based control → not ideal for ultra-fast switching
🧩 System Architecture
The module consists of:
Capacitive humidity sensor (probe)
Microcontroller (processing + logic)
Relay output stage
LED display + control buttons
👉 Combines sensing + processing + actuation in one unit.
🏁 Summary
The ZFX-13001 humidity controller is a complete humidity regulation system that:
Uses a capacitive humidity sensing method
Provides 1–99% RH measurement range
Supports automatic humidification/dehumidification control
Includes relay output (up to 10A load)
Offers stable, closed-loop environmental control