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:
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.
Electrstrong> 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 Feat
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 oper
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.
oller is a complete humidity regulation system that:
Uses a capacitive humidity sensing method
Provides 199% RH measurement range
Supports automatic humidification/dehumidification control
Includes relay output (up to 10A load)
Offers stable, closed-loop environmental control