Compatibility check 1: detection zones and range
For mmwave presence sensors, record the exact value, standard, measurement, or supported condition behind detection zones and range before checkout. A broad category label does not prove that the selected variant fits. Confirm the manufacturer, complete model, hardware revision, electrical rating, protocol, controller support, included parts, and region rather than assuming similarly named products share limits.
Compatibility check 2: wall, ceiling, or corner geometry
Test wall, ceiling, or corner geometry across the actual fixture, circuit, controller ecosystem, radio path, owner account, and manual fallback—not a product-photo setup. If this mmwave presence sensors fit depends on a neutral wire, hub, bridge, account, subscription, compatible controller, professional installation, or reliable cloud service, confirm the exact part, service, or behavior as part of compatibility.
Compatibility checks 3 and 4: false presence through thin materials; hub, power, and automation latency
For mmwave presence sensors, false presence through thin materials and hub, power, and automation latency are the limiting conditions most likely to surface only after installation. Measure the smallest clearance, weakest connection, least compatible user or device, and the most demanding normal task. Passing an ideal bench test is not enough.
Prove fit in a reversible order
Use this sequence: mount temporarily, observe raw detection for several days, exclude fans and adjacent rooms, then use presence in noncritical automations. Keep labels, packaging, manuals, and the previous system until the product works through normal use and a recovery test. Photograph wiring, measurements, or assembly states that would be difficult to reconstruct.
A failed fit check is a stop signal
Stop when the room geometry cannot isolate the target area or the automation has safety consequences when presence is wrong. Do not repair a fundamental mismatch with unapproved accessories, copied settings, or community anecdotes. Use pir motion sensors when it meets the job with a clearer compatibility path.