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Design-in Guide SGD43S-M3-Sx
For SGD43S-M3-Sx Refrigerant Detection System
The SGD4x sensor family is Sensirion's series of gas concentration sensors designed for the HVACR industry.
The sensor is fully calibrated and compensated for maximum accuracy and ease of integration. This document
aims at helping the proper design-in of a refrigerant sensor / detection system in HVACR appliances.
Contents
1
Select the right SGD43S-M3-Sx variant for your application ........................................................................................... 2
2
Sensor & Refrigerant Detection System Operation .............................................................................................................. 2
3
Mechanical Considerations ............................................................................................................................................................. 3
3.1 Appliance Integration ............................................................................................................................................................. 3
3.2 Sensor Orientation ................................................................................................................................................................... 3
3.3 Sensor Mounting ...................................................................................................................................................................... 4
3.4 Inlets .............................................................................................................................................................................................. 4
3.5 Vibration ...................................................................................................................................................................................... 4
3.6 Sunlight ........................................................................................................................................................................................ 4
4
Electrical considerations................................................................................................................................................................... 5
4.1 Connector .................................................................................................................................................................................... 5
4.2 Power supply .............................................................................................................................................................................. 5
4.3 Multicomponent System ....................................................................................................................................................... 5
5
Revision History ................................................................................................................................................................................... 6
www.sensirion.com / D1
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Version 1.0 - Apr 2025
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Summary of Contents for SENSIRION SGD4 Series
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Page 1: Table Of Contents
Design-in Guide SGD43S-M3-Sx For SGD43S-M3-Sx Refrigerant Detection System The SGD4x sensor family is Sensirion’s series of gas concentration sensors designed for the HVACR industry. The sensor is fully calibrated and compensated for maximum accuracy and ease of integration. This document aims at helping the proper design-in of a refrigerant sensor / detection system in HVACR appliances. -
Page 2: Select The Right Sgd43S-M3-Sx Variant For Your Application
Figure 1: Timeline of the operation of the SGD43S-M3-Sx, with a leak event. The resulting Refrigerant Detection System (RDS) states, status light and relay states are depicted on the upper part. The sensor’s refrigerant concentration reading is plotted on the bottom part. www.sensirion.com / D1 Version 1.0 – Apr 2025 2 / 7... -
Page 3: Mechanical Considerations
NOTICE: The sensor should not be installed with the connector facing upwards, especially in situations where water or condensate may be dripping on the sensor from above. www.sensirion.com / D1 Version 1.0 – Apr 2025 3 / 7... -
Page 4: Sensor Mounting
3.6 Sunlight Do not expose sensor to direct sun. Exposing SGD43S-M3-Sx to direct sunlight might introduce temperature gradients and accelerate aging. www.sensirion.com / D1 Version 1.0 – Apr 2025 4 / 7... -
Page 5: Electrical Considerations
Communication with each distinct sensor requires each device to have a dedicated address. The device address can be modified using the Modbus interface described in the sensor datasheet. www.sensirion.com / D1 Version 1.0 – Apr 2025 5 / 7... -
Page 6: Revision History
Revision History Date Version Pages Changes April 2025 Initial version www.sensirion.com / D1 Version 1.0 – Apr 2025 6 / 7... -
Page 7: Important Notices
Warranty SENSIRION solely warrants to the original purchaser of this product for a period of 12 months (one year) from the date of delivery that this product is of the quality, material and workmanship defined in SENSIRION’s published specifications of the product.
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