Dual PIR and thermopile detection
Dual PIR and thermopile detection.

Desk & Seat Occupancy Sensor
The VS341 is a Desk & Seat Occupancy Sensor. It can drive a DS3604 E-ink display to show whether a workstation is free. It has LoRaWAN LoRaWAN®, Milesight D2D as listed in the specification.
Dispatch and lead time are confirmed in the quote.
Manufacturer warranty24 months
Overview
The VS341 is a LoRaWAN desk and seat occupancy sensor that pairs a sensitive PIR with a thermopile. It is the high-accuracy member of the VS34x family, made for applications that need dependable seat-level data.
PIR captures motion while the thermopile reads temperature variation in the target area. Combining both signals confirms genuine occupancy and raises recognition to up to 98%.
Status updates are fast, with occupied detected in about 13 seconds and vacant in about 60 seconds. This near real-time behaviour suits booking systems and live availability displays.
Five interchangeable covers tune the detection angle to different desks and scenarios. This focuses the sensor on the target seat and avoids counting movement from neighbours.
Low-power LoRaWAN gives a long battery life of up to 10 years from a single ER18505 cell. NFC configuration and peel-and-stick mounting make bulk deployment quick.
The Milesight D2D protocol lets the sensor talk to other Milesight devices without a gateway. It can drive a DS3604 E-ink display to show whether a workstation is free.
Dual PIR and thermopile detection.
Up to 98% recognition rate.
100% anonymous, GDPR compliant.
Low latency, near real-time.
Adjustable PIR detection angles.
Milesight D2D, gateway-free control.
PIR area 107° × 107°.
Thermopile area 50°.
Technical data
| Specifications | |
|---|---|
| Technology | PIR & thermopile |
| Recognition Rate | Up to 98% (thermopile best at +10 to +30 °C) |
| PIR Detection Area | 107° horizontal, 107° vertical |
| PIR Detection Distance | Within 1 m |
| Thermopile Detection Area | 50° (50% level of sensitivity) |
| Specifications | |
| Protocol | LoRaWAN®, Milesight D2D |
| Antenna | Internal antenna |
| Frequency | CN470/IN865/EU868/RU864/US915/AU915/KR920/AS923-1&2&3&4 |
| Tx Power | 16 dBm (868 MHz) / 20 dBm (915 MHz) / 19 dBm (470 MHz) |
| Sensitivity | −137 dBm |
| Mode | OTAA/ABP Class A |
| Specifications | |
| Button | 1 × power / reset button (internal) |
| Indicator | 1 × status indicator |
| Power On/Off | Mobile app via NFC or power button |
| Configuration | NFC via mobile app, downlink |
| Advanced Feature | Milesight D2D controller |
| Specifications | |
| Power Supply | 1 × 4000 mAh ER18505 Li-SOCl2 battery |
| Battery Life | Over 10 years (SF7, EU868 & US915); ~5.2 years (SF10, EU868); ~5.1 years (SF10, US915) |
| Operating Temperature | −20 °C ~ +60 °C |
| Relative Humidity | 0 ~ 95% (non-condensing) |
| Dimensions | 73 × 73 × 26 mm (without PIR cover) |
| Weight | 90 g |
| Ingress Protection | IP30 |
| Colour & Material | White + grey, PC + ABS (flame retardant) |
| Installation | 3M tape or wall screw mounting |
| Specifications | |
| Environmental | RoHS |
| Privacy | GDPR compliant, anonymous detection |
No specification rows match the filter.
Applications
Offices track hot desk usage with high accuracy to optimise space and cut cost. Reliable seat data supports booking and a smoother employee experience.
Libraries show which study seats are free in real time. Thermopile confirmation reduces false free or busy readings.
Dining areas monitor table occupancy to manage seating and service. Anonymous detection keeps guests comfortable.
Transport hubs track seat use in lounges and waiting areas. Accurate data guides cleaning and capacity decisions.
Questions
Over 10 years (SF7, EU868 &, according to the specification.
IP30, according to the specification.
–20 … +60 °C, according to the specification.
LoRaWAN®, Milesight D2D, according to the specification.
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Manufacturer warranty24 months
Europe & United Kingdom
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