Installation

Installation Location

  • The recommended installation distance of VS340 is 0 to 50 cm away from the table edge.
  • The recommended installation distance of VS341 is 0 to 40 cm away from the table edge. Besides, the best distance is 20 to 40 cm.
Note: Ensure the detection area is not blocked by curtains or barriers.

Installation Steps

PIR Cover Installation

Take off the front cover of the device, then select the PIR cover as required and put it on the PIR sensor with groove alignment. The adjustable angle of every groove is 30°.





PIR cover reference guidance (installation height=70cm):
PIR Cover Detection Area Usage Scenario


70 ° Horizontal, 60 ° Vertical,

1 m × 0.9 m

 Single Person Desk


70 ° Horizontal, 107 ° Vertical,

1 m × 1.8 m

 Face to Face Desk


107 ° Horizontal, 53.5 ° Vertical,

1.8 m × 0.9 m

 Bar Table


107 ° Horizontal, 107 ° Vertical,

1.8 m × 1.8 m

 Round Table


N/A Support to be tailored as required
Fixed by 3M Tape
Attach 3M tape to the back of sensor, then tear the other side and place it under the working desk. Please adjust the installation direction according to the detection area and ensure that the thermopile sensor should be placed toward the seat.



Note:
  1. Since the default 3M tape has a high viscosity, please tear the device down via screwdriver.
  2. If it is necessary to tear the device down easily, please divide the 3M tape as several parts and only tear one part to device.
Fixed by Mounting Kits
Step 1: Take off the front cover of the device, then fix the wall plugs under the desk according to the device mounting holes, and fix the device to the wall plugs with screws. Please adjust the installation direction according to the detection area and ensure that the thermopile sensor should be pointed to the seat.

Step 2: Restore the front cover back to the device.



Factors Affecting Accuracy

VS340
  • Person remains seated and motionless in a chair for 5 minutes, as it may cause false releases.
  • Person is seated and lightly shaking their legs or shaking their legs vertically up and down, as it may cause false releases.
  • No chair obstructing the seat, someone passes by closely, or a cleaner mops the floor, as it may cause false occupancy.
VS341
  • The recommended operating temperature of thermopile sensor is 10~30°C. Exceeding this range may affect detection accuracy.
  • Person suddenly covers themselves with a blanket while seated, as it may cause false release.
  • In environments with fans or air conditioning, a person remains seated for a long time, the target temperature gradually approaches the ambient temperature, and remains motionless for 1 minute, as it may cause false release.
  • Person remains seated for a long time on a chair made of non-breathable materials (e.g., leather chairs), causing residual warmth for an extended period, as it may cause delayed release.
  • Person stands up and moves away from the device, causing the temperature difference to reach a critical point, as it may cause possible false release.