Controllers

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Humidity controllers

Instruments, sensors and controls

Controllers – precise humidity control for commercial applications

Controllers are the central interface between your humidification system and the environment it serves. They ensure the right amount of moisture is delivered at the right time, helping maintain stable, comfortable and productive indoor conditions. Condair’s controller range is designed for reliability, flexibility and ease of use across commercial and industrial applications.

At their core, controllers interpret humidity data and regulate humidifier operation to achieve the desired set-point. Simple on/off controllers provide essential safety and basic control, ensuring systems do not over–saturate ducts or spaces. They often include outdoor temperature setback and fan management functions to support efficient operation.

More advanced modulating controllers deliver a variable control signal that adjusts humidifier output in proportion to the difference between current and target humidity. This enables tighter control and smoother responses in dynamic environments, such as variable air volume (VAV) systems.

Integrated controllers with touchscreen displays further streamline commissioning and operation. They allow on-screen parameter adjustment, diagnostics and communication with building management systems via common protocols like BACnet, Modbus or LonWorks.

In summary, Condair controllers provide the intelligence needed to maintain precise humidity levels, improve system performance and integrate seamlessly with broader building automation strategies.

Controllers

Top of page DCC RCC UDC FAQs

DCC - humidity controller with external duct sensor

Humidity Controller with external duct sensor

This controller is developed for industrial and commercial duct applications where humidifiers do not feature an integrated control function. It is well suited for installations with demanding humidity control needs, for example in process-driven humidification systems.

The unit is supplied in a flush-mount housing with EU-standard dimensions, compatible with 68 mm and 71 mm mounting boxes, allowing for straightforward installation. A 3" backlit display ensures clear visibility and ease of use during operation.

For secure and flexible control, user and system parameters are password-protected, and 7-day programmable schedules support time-based operation. Humidity measurement is handled by a capacitive sensing element, providing stable and accurate control performance.

Technical Specifications

Accuracy: ±2.5 % rH
Supply: 24 V AC/DC
Output: 0…10 V / 0…20 mA, 2…10 V / 4…20 mA
Probe length: 157 mm (6.2")
PID and/or binary control for de-/humidifier

Product overview

RCC – Room controller with display

Room controller with display

Designed for industrial and commercial duct and room applications, this controller is intended for humidifiers without an internal control function. It is particularly suited for installations with high humidity control requirements, such as humidification for process-related applications.

The unit is housed in an EU-standard flush-mount enclosure, compatible with 68 mm and 71 mm mounting boxes, ensuring easy integration into building installations. It features a 3" backlit display for clear visibility and intuitive operation. User and control parameters are password-protected to ensure secure system access.

Additional functionality includes 7-day programmable schedules for flexible operation and a capacitive sensing element that provides reliable and accurate humidity measurement.

Technical specifications

Accuracy: ±2.5 % rH
Supply: 24 V AC/DC
Output: 0…10 V / 0…20 mA, 2…10 V / 4…20 mA
PID and/or binary control for de-/humidifier

Product overview

UDC – Universal Duct Controller

Universal Duct Controller

Designed for industrial and commercial duct applications, this controller is ideal for systems with special requirements, such as dehumidification. It is fully programmable and compatible with all Condair devices, with particular suitability for dehumidifiers.

The controller features two freely programmable PID control loops with corresponding outputs, as well as one additional programmable binary output, providing flexible and precise control. An outdoor temperature input enables setback operation, supporting energy-efficient system performance.

User and control parameters are password-protected to ensure secure operation. Configuration is easily carried out via a PC interface. The unit is equipped with a backlit display for clear readability and a capacitive sensing element for reliable and accurate measurement.

Technical specifications

Accuracy: ±2.5 % rH ±0.4 °K
Supply: 24 V AC/DC
2x Analog Out: 0…10 V / 0…20 mA, 2…10 V / 4…20 mA
1x Digital Out: Changeover contact
Probe length: 157 mm (6.2")

Product overview

Frequently asked questions

Can humidity controllers be integrated with Building Management Systems (BMS)?

Yes. Many modern humidity controllers are designed for seamless integration with Building Management Systems using industry-standard communication protocols such as BACnet, Modbus or LonWorks. This allows facilities managers to monitor and control indoor climate conditions centrally, optimise energy usage and respond quickly to deviations.

BMS integration is particularly valuable in large commercial buildings, healthcare facilities, production environments and heritage properties where humidity control plays a critical role in operational continuity.

How do humidity controllers help protect buildings and valuable assets?

Maintaining correct relative humidity levels reduces the risk of condensation, mould growth, material degradation and electrostatic discharge. In commercial offices, it supports occupant wellbeing and productivity. In archives, museums and specialist production facilities, it helps preserve sensitive materials and maintain product quality.

A reliable humidity control strategy is therefore not just about comfort – it is about protecting investments, reducing maintenance costs and ensuring compliance with environmental standards.

How does a humidity controller improve energy efficiency and system performance?

Advanced humidity controllers use precise sensors and intelligent control logic, such as proportional or PID control, to maintain a consistent humidity setpoint without overshooting. This prevents unnecessary water and energy consumption while reducing system wear.

Basic on/off controllers provide dependable control for straightforward applications, while modulating controllers deliver smoother operation for variable air volume systems or environments where tighter humidity tolerances are required. The result is improved HVAC performance, lower operating costs and enhanced environmental stability.

What is a humidity controller and why is it essential in HVAC systems?

A humidity controller is the central control unit in a humidification system, designed to monitor and regulate relative humidity (RH) levels in commercial, industrial and specialist environments. By continuously measuring air moisture and adjusting humidifier output accordingly, it ensures stable indoor air conditions that support occupant comfort, protect building fabric and safeguard sensitive equipment or materials.

In modern HVAC systems, accurate humidity control is not a luxury – it is a requirement for energy efficiency, system reliability and long-term asset protection.

What types of humidity controllers are available for commercial and industrial use?

Humidity controllers are available in several configurations to suit different applications. Room-based controllers with integrated displays provide intuitive local control and easy commissioning. Duct-mounted controllers with external sensors are ideal for air handling units and industrial ventilation systems. More advanced multi-loop controllers allow programmable control strategies for complex HVAC installations.

Choosing the right controller depends on required accuracy, environmental conditions, system complexity and integration requirements. A correctly specified controller ensures long-term stability and optimal humidification performance.

Get free expert advice

If you want to explore your options for humidity control, Condair's expert sales engineers will visit your site, review your project and talk you through their recommendations.

Alternatively, if you would prefer a call or online meeting, our team are always happy to discuss possible solutions and offer free technical advice.