Side-by-side
PIR Passive Infrared Sensor vs GS-21 Underground Sensor
Spec comparison for two products on Aviation Souk. Both compete in perimeter-security.
perimeter-security
PIR Passive Infrared Sensor
by exensor
Rapidly deployable passive-infrared thermal barrier detecting moving targets and their direction of travel.
perimeter-security
GS-21 Underground Sensor
by vortex-systems
Buried UGS with external seismic line-string support for extended pedestrian detection along a perimeter
| Cost of ownership | PIR Passive Infrared Sensor | GS-21 Underground Sensor |
|---|---|---|
| Price tier | — | — |
| Lead time (weeks) | ?–? | ?–? |
| Delivery | — | — |
| Install | — | — |
| GCC airports deployed | 0 | 0 |
| Certifications | 2 | 0 |
Specs
Technical specifications.
| Spec | PIR Passive Infrared Sensor | GS-21 Underground Sensor |
|---|---|---|
| Sensing modality | Passive infrared (thermal barrier), detects moving targets and direction of travel | — |
| Architecture | Module Core unit (integrated radio, GPS, battery) + interchangeable PIR module | — |
| PIR modules | Three variants - short, medium, long range - with different detection ranges and fields of view | — |
| Sensitivity | Three remotely configurable sensitivity levels | — |
| Dimensions (short module) | 63 x 74 x 185 mm | — |
| Dimensions (medium module) | 63 x 74 x 208 mm | — |
| Dimensions (long module) | 63 x 74 x 265 mm | — |
| Weight (short / medium / long) | 0.58 / 0.59 / 0.80 kg | — |
| Battery life | 30 days integrated rechargeable; 1-year battery option; external battery connectable | 1+ year |
| Radio | Integrated 1 km mesh-networked radio; node relays data from other sensors | Built-in 5 W VHF, strong foliage penetration |
| Expansion | One additional PIR module connectable to the Core module; PIR module can be remoted on cable or attached to any other Flexnet sensor via multi-connector | — |
| Interfaces | Input/output signals | — |
| Encryption | AES-256; alarm data stored in device in radio-silence mode until retrieved | — |
| Positioning | GPS for self-localisation | — |
| Anti-tamper | Built-in anti-tamper with GPS | — |
| Operating temperature | -32 to +71 degC | — |
| Environmental standard | MIL-STD-810 | — |
| EMC standard | MIL-STD-461 | — |
| Sensing modalities | — | External seismic line strings (pedestrian) + internal magnetic sensor (vehicle presence and travel direction) |
| External sensor inputs | — | PIR (pedestrian/vehicle presence + travel direction) and contact-closure |
| Radio range | — | Up to 35 miles line-of-sight |
| Output | — | Mechanical relay to trigger external devices (cameras, lights, sirens) |
| Security | — | Tamper switch |
| Timing | — | Real-time clock; programmable self-test messages and scheduled access windows |
| Compatibility | — | Legacy Vortex and Monitron systems |
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