24GHz Large-space presence sensor（RS485 version）
MSA237D 99 485 is a 24GHz radar sensor based on Merrytek patented orthogonal antenna. Its antenna has high gain and wide detection range. Combined with Merrytek’s unique 4th generation human presence detection software algorithm and FMCW modulation,it can accurately detect micro 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.
| Input/Output | Input voltage | 12-24V DC |
| Rated voltage | 24V DC | |
| Working Current | @12Vdc：80±3mA @24Vdc：42±3mA |
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| Working Power | ≤1.2W @24V DC | |
| Output signal | RS485（factory setting is data report mode,and you can switch to data inquiry mode by merrytek wechat mini program） | |
| Load type | Data report/data inquiry | |
| Sensor Parameter | Radar frequency | 24GHz -24.25GHz，ISM band |
| Transmitting Power | 5mW Max. | |
| Detection Area | 0-4m(setting by merrytek mini program) | |
| Hold Time | 3-7200s (setting by merrytek mini program)Remark: For better presence detection,hold time shall set >30S | |
| Daylight threshold | 5-2000Lux(setting by merrytek mini program,when value set as 2000lux,daylight sensor is disabled) | |
| Daylight sensor range | 0-2000Lux | |
| Radius detection range (based on 4m gear and medium sensitivity) |
major/minor/micro movement（3m height installation）: 4±0.5m（based on 41㎡ open area test and might change due to different space） | |
| Sensitivity | high/medium/low | |
| Remote control | Unavailable | |
| Merrytek mini program | Available | |
| Mounting height | 2.5-4.0m typical value:3m | |
| Detecting Angle | 120° | |
| Application Environment | Drill hole | Φ50-55mm |
| Working Temperature | 0℃…+50℃ | |
| Storage Temperature | -25℃~+80℃ Humidity:≤85% (non-condensation) | |
| Certificate Standard | Certificate | FCC/RED |
| Environmental Requirement | Compliant to RoHS | |
| IP Rating | IP20 | |
| Guarantee | 5 year（only for product quality problem） | |
| Note: “N/A” means not available | ||
Product dimension
Initialization
When powered on,sensor indicator will stay on for 15s for recongnize application room size, after that sensor will enter 10s flashing self-checking phase,after that it will enter a 20S detection cycle,if there’s presence detected, sensor will report absence.During initialization,sensor will not detect moving signal and you can use merrytek wechat mini program 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：
