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MSA237K 99 C is a 24GHz radar sensor based on Merrytek patented orthogonal half-wave bending antenna. Its antenna has high gain and wide detection range and is combined with Merrytek’s unique software algorithm. It can accurately detect minor movements brought by human in almost all indoor spaces and provide fast and accurate front-end sensing input for smart home, smart hotel, smart office and other scenes by KNX communication.
 
                | Input/Output | Auxiliary Power Supply Voltage Range | 12-30V DC | 
| KNX Terminal Voltage | 21-30V DC | |
| Auxiliary Power Supply Working Current | 12V : 55±3mA Max 24V: 30±3mA Max | |
| KNX Terminal Current | 3±1mA | |
| Working Power | ≤1W @24V DC | |
| Sensor Parameter | Working Frequency | 24GHz-24.25GHz ISM band | 
| Transmitting Power | 5mW Max | |
| Detection Area | ETS/remote setting: 0.5-4m | |
| Hold Time | ETS/remote setting: 3S-7200S Remark: For better presence detection,hold time shall set >30S | |
| Detecting Range (100% detection area, radius) | major/minor/micor movement(3m height installation): 3.5±0.5m(based on 41㎡ open area test and might change due to different space) | |
| Remote Control | Support | |
| Mounting Height | 2-4m, typical value: 3m | |
| 3db Beam Angle | 100° (XZ field) | |
| 100° (YZ field) | ||
| Application environment | Flush-mounted Hole Size | Φ50-55mm | 
| Working Temperature | 0℃…+50℃ | |
| Storage Temperature | -40℃…80℃, Humidity: ≤85%(non-condensing) | |
| Certificate Standard | Certificate | FCC/RED | 
| Environmental Requirement | Compliant to RoHS | |
| IP Rating | IP20 | |
| Gurantee | 3 year(only for product quality problem under indoor application) | |
| “N/A” means not available | ||
Dimension
Initialization
When powered on,sensor indicator will turn off after flashing for 10S and will enter a 20S detection cycle,if there’s presence detected,then sensor will enter hold time calculating,if absence detected,then sensor relay will disconnect.During initialization,sensor will not detect moving signal and you can use our MH18 remote to adjust detection area、hold time and daylight sensor etc parameter.
Factory setting
Detection Area: 4m, Hold Time: 30S, Indicator Light: open, Sensitivity : medium sensitivity
Detection Signal
The product detects human moving, minor moving, and presence signals, and realizes the detection of human-existing/no-human in non-sleep state. The following is a description of the moving, minor moving and presence signals:

Wiring layout suggestion:
 
                    