Schneider MTN663991 KNX Brightness and Temperature Sensor, Light Grey

Description

Introduction

The Schneider MTN663991 is a high-precision outdoor-capable KNX sensor engineered to record ambient brightness and outdoor temperature, transmitting real-time operational data directly to the KNX bus network. Designed in a durable light grey finish (RAL 7035) with surface-mounting capabilities, this sensor serves as a vital environmental telemetry node for modern intelligent building automation systems. This device is part of our KNX system components range.

Equipped with an integrated bus coupling unit, the MTN663991 simplifies system architecture by connecting directly to the KNX line without requiring separate interface modules. By providing reliable light and temperature measurements, it enables intelligent HVAC climate control, automated solar shading, and energy-optimized lighting strategies, delivering significant operational cost savings for commercial and residential developments.

Key Features

• Measures ambient light levels and external temperatures for KNX bus transmission.
• Integrated KNX bus coupling unit (BCU) built directly into the housing.
• IP54 degree of protection for reliable outdoor and surface-mounted deployment.
• Light grey (RAL 7035) finish suitable for external building facades.
• Low bus power consumption with a 5 mA power supply input current.
• Supported by Schneider Electric’s 18-month standard warranty.

Benefits

• Dual Environmental Sensing: Combines brightness and temperature monitoring within a single compact field device.
• Integrated Bus Coupling Unit: Direct KNX bus connectivity eliminates the need for external bus coupling components.
• Outdoor-Ready IP54 Protection: Rugged surface-mounted enclosure rated IP54 protects against dust ingress and water splashes.
• Energy Optimization: Supplies continuous telemetry to automatically balance natural daylight, artificial lighting, and HVAC systems for lower energy consumption.
• Flexible Surface Mounting: Streamlines installation on external facades, outdoor walls, or designated technical areas.
• Eco-Friendly Lifecycle: Manufactured with a reduced carbon footprint (10 kg CO2 eq) and packaged using high-content recycled materials.

Technical Specifications

Specification	Value
Product Series	KNX
Product or Component Type	Brightness and temperature sensor
Bus Type	KNX
Available Function	With integrated bus coupling unit
IP Degree of Protection	IP54
Colour Tint	Light grey (RAL 7035)
Power Supply Input Current	5
Wiring Device Mounting	Surface
Number of Units in Package	1
Package Weight (Lbs)	156.000
Warranty	18 months
Unit Type of Package 1	PCE
Unit Type of Package 2	CAR
Number of Units in Package 2	24
Package 1 Height	7.400
Package 1 Width	7.700
Package 1 Length	12.400
Package 2 Height	20.000
Package 2 Width	30.700

Applications

• Automated Shading and Blind Actuation: Drives motor-driven blinds and facade louvers based on real-time ambient lux levels to limit solar heat gain.
• Weather-Compensated HVAC Control: Feeds accurate exterior temperature values to central KNX heating and cooling controllers.
• Facade and Daylight-Harvesting Lighting: Coordinates exterior wall luminaires and indoor lighting zones with natural ambient daylight conditions.

Installation Notes

• Mount the unit on a flat surface using appropriate wall fixings, positioning the sensor where it receives representative ambient light without direct artificial lighting interference.
• Connect the standard KNX bus wire directly into the integrated bus coupler terminal block inside the housing.
• Verify that the IP54 sealing gaskets and cable entry glands are securely fastened to preserve weather protection against dust and moisture.

Developer Resources

• ETS Application Database for Schneider MTN663991 parameter configuration and threshold commissioning.
• Manufacturer technical datasheet and surface-mounting mechanical dimensional layout guide.
• KNX system integration wiring diagrams for external sensor topology.

FAQ

What functions does the Schneider MTN663991 sensor perform?

The device measures external ambient brightness and ambient temperature, transmitting both data points continuously to the KNX bus line. Explore more Schneider KNX products for professional building automation projects.

Does this sensor require a separate KNX bus coupler?

No, the MTN663991 includes an integrated bus coupling unit, enabling direct wiring to the KNX twisted pair line. For certificates and current technical files, refer to the official Schneider product page.

What is the IP protection rating of the MTN663991 housing?

The device features an IP54 ingress protection rating, making it suitable for surface-mounted exterior installation.

What is the warranty period offered on this Schneider product?

This product comes with an 18-month manufacturer warranty from Schneider Electric.

What is the exact product model?

The order/model code for this page is MTN663991. Match it against project documents before purchase.

Who is the manufacturer?

This product is manufactured by Schneider.

Conclusion

The Schneider MTN663991 KNX Brightness and Temperature Sensor provides dependable environmental monitoring for modern building control networks. Its combination of dual telemetry, surface-mount IP54 housing, and an integrated bus coupler makes it a flexible choice for smart facade control and automated climate management. Installers and system integrators can review our installer purchasing support options.

By delivering accurate light and temperature data directly to KNX actuators, the MTN663991 supports long-term operational efficiency and sustainable building performance.