Relative Humidity HVAC Sensors

Introduction to Relative Humidity HVAC Sensors

What is it?

Humidity sensors for HVAC systems are devices that measure and monitor the relative humidity (RH) of air in heating, ventilation, and air conditioning systems. They can be used to control and regulate humidity levels in different zones or areas of a building.

Why we use it?

We use humidity sensors to improve occupant comfort, prevent mold growth, optimize energy usage, and ensure system performance by monitoring and controlling humidity levels in HVAC systems.

How it works?

The sensor typically contains a sensing element, such as a capacitive polymer or thin-film device, which interacts with the air to produce a signal proportional to the relative humidity. The device then calculates the RH based on the magnitude of the signal produced.

Major brands that manufacture it

Some of the major brands that manufacture humidity sensors for HVAC systems include Honeywell, Johnson Controls, Schneider Electric, and Siemens.


There are different types of humidity sensors, including capacitive and resistive models. Some models may also feature additional functions, such as temperature sensing or wireless connectivity.

How do we select it?

When selecting a humidity sensor, consider factors such as measurement range, accuracy, response time, compatibility with the HVAC system, and communication protocols. Also, make sure the sensor is compatible with your existing control and automation systems.

How to install it?

Humidity sensors should be installed in the location where humidity needs to be measured, such as a duct or room. They should be mounted securely using appropriate fittings or adapters, and any necessary wiring connections should be made to the building automation system or controller.

Wire connections required to receive the signals

The wire connections required to receive the signals from a humidity sensor may vary depending on the specific device and building automation system. Typically, they will require a power supply connection and a communication signal wire that connects to the building automation system or controller. It's important to refer to the manufacturer's installation instructions for proper wiring connections.

in MEP
Relative Humidity HVAC Sensors
Administrator December 22, 2023
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