Humidity Sensor & Controller

Product Specifications

Technical details and manufacturing context for Humidity Sensor & Controller

Definition

Within a Humidification System, this integrated component serves as the central monitoring and regulation unit. It continuously detects relative humidity through its sensor element and processes this data to control humidifiers, valves, or other actuators, ensuring the environment maintains precise humidity setpoints for process stability, product quality, or comfort. The device combines a humidity sensor and a controller in one housing, simplifying installation and reducing wiring. The sensor element, often capacitive or resistive, changes its electrical properties in response to ambient moisture. This signal is converted and processed by the controller's circuitry or software, then compared to a user-defined setpoint. Based on the deviation, the controller outputs a control signal (e.g., on/off, PWM, 0-10V, 4-20mA) to adjust the output of the connected humidification device. Typical applications include HVAC systems, cleanrooms, storage facilities, and industrial processes where humidity control is critical. The device features a measuring range of 0–100 %RH, an accuracy of ±2 %RH at 25°C, and a response time of ≤8 seconds for 63% of a step change. It operates within a temperature range of -20 to 60°C and requires a 24 V DC supply (±10%), with AC versions available. The output signal is analog, 2-wire, 4–20 mA, and the contact rating is 5 A resistive load at 250 V AC. The housing is made of ABS (UL94 V-0 rated) and offers an IP rating of IP54–IP65 (dust and splash proof) per IEC 60529. The weight ranges from 0.3 to 0.5 kg depending on the model. Materials used include a polymer sensor membrane, epoxy resin, copper alloy electrodes, PCB (FR-4), and a plastic/polycarbonate housing. For selection, verify the required measuring range, accuracy, output signal type, and environmental conditions. Confirm model-specific values and standards with the legal manufacturer or supplier before procurement.

Working Principle

The sensor element (often capacitive or resistive) changes its electrical properties in response to ambient moisture. This signal is converted, processed by the controller's circuitry or software, and compared to a user-defined setpoint. Based on the deviation, the controller outputs a control signal (e.g., on/off, PWM, 0-10V, 4-20mA) to adjust the output of the connected humidification device.

Common Materials

Polymer sensor membrane, Epoxy resin, Copper alloy electrodes, PCB (FR-4), Plastic/Polycarbonate housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Measuring Range	0–100 %RH	Full range for humidity sensing
Accuracy	±2 %RH	At 25°C, typical
Response Time	≤8 s	For 63% of step change
Operating Temperature	-20–60 °C	Sensor and controller
Supply Voltage	24 ±10% V DC	AC versions available
Output Signal	4–20 mA	Analog, 2-wire
Contact Rating	5 A	Resistive load, 250 V AC
IP Rating	IP54–IP65	Dust and splash proofIEC 60529
Housing Material	ABS	UL94 V-0 rated
Weight	0.3–0.5 kg	Depending on model

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Humidity Sensing Element Part
Detects changes in ambient moisture by altering its capacitance or resistance.

Material: Polymer film with conductive electrodes
Signal Conditioning Circuit
Amplifies and converts the weak analog signal from the sensor into a stable, readable format for the processor.

Material: PCB with integrated circuits (ICs), resistors, capacitors
Microcontroller / Processor
Compares the processed sensor signal to the user-defined setpoint and executes the control algorithm to determine the necessary output.

Material: Integrated circuit (IC chip)
Output Driver / Relay
Acts as the switch or signal generator that physically controls the power or signal to the connected humidification equipment.

Material: Electromechanical relay or solid-state components
User Interface (Display & Controls)
Allows for setting the humidity setpoint, viewing current readings, and configuring device parameters.

Material: LCD/LED screen, membrane keypad or buttons, plastic bezel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Humidification System

View system integration details

Manufacturers of Humidity Sensor & Controller

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Frequently Asked Questions

What is the measuring range of this humidity sensor and controller?

The measuring range is 0–100 %RH, as listed in the directory. However, always verify the exact range for the specific model with the manufacturer or supplier, as variations may exist.

What output signals are available?

The device provides an analog 2-wire 4–20 mA output signal. Other signal types may be available depending on the model; confirm with the supplier.

What is the operating temperature range?

The operating temperature range is -20 to 60°C for both sensor and controller. Ensure the installation environment stays within this range to avoid malfunction.

What is the IP rating and housing material?

The IP rating is IP54–IP65 per IEC 60529, indicating dust and splash protection. The housing is made of ABS (UL94 V-0 rated). Verify the exact rating for your model.

Data Basis

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accuracy:	±2% RH typical, ±3% RH maximum
pressure:	Atmospheric to 1.5 bar absolute
temperature:	-20°C to +60°C
response time:	15 seconds typical for 63% step change
humidity range:	0% to 100% RH (non-condensing)

Product Specifications

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