The sensors are low power end devices and have a sleep mode. I.e. they only transmit data when awake and connected to a Thread network.

Powered by alkaline battery

The sensor is powered by alkaline batteries supplied within the sensor packaging.

  • QAA2890/WI, QFA2890/WI: 3 x alkaline batteries type AAA, 1.5 V
  • QPA2892/WI: 2 x alkaline batteries type AA, 1.5 V

When the battery level is low and the network connection is normal, a battery low-level alarm is sent to the gateway to replace batteries.

Users can check the battery level by shortly pressing the push button on the rear of the device to activate the LED. The batteries are almost empty if the LED is red and keeps flashing fast (100 ms on / 100 ms off) for 8 s. In this case the batteries must be replaced within 2 maximum weeks.

Notes

  • Do not install used or low-quality batteries.
  • Do not mix used and new batteries; this may cause leakage.
  • Do not use leaking or deformed batteries.
  • Do not use rechargeable batteries.
  • Do not remove batteries during commissioning and configuration.
  • Replace batteries as soon as low-level battery alarm is sent to the gateway. Dispose the batteries through the proper channels and in accordance with local and national legislation.
  • Network connection is lost if the battery is too low.
  • Check battery power periodically as batteries might leak in case they are in low power-level for a longer time period.

Battery lifetime

Battery life is calculated and may deviate depending on the environment and operating conditions of the sensors.

Push button and LED indication

The push button on the rear of the device is used for operation; the LED on the front of device for states.

LED

In the following table:

  • Short press (<2 s)
  • Long press (>20 s)

LED color

Device status

LED pattern

Push button operation

Off

Unpowered device / powered device without display

Off

N/A

Green

Start up (e.g. battery installation)

Fast flashing (100 ms on / 100 ms off) for 3 s

N/A

Normal (connected)

On for 8 s

Short press to activate LED

Joining

Flashing (¹/₄ s on / ⁷/₄ s off) during joining and times out after 120 s

Short press to activate LED, then short press within 8 s to join 1)

Orange

Initial state (no connection)

On for 8 s

N/A

Factory reset

Fast flashing (100 ms on / 100 ms off) for 8 s

Long press to start factory reset

Red

Connection lost 4)

Flashing (¹/₄ s on / ⁷/₄ s off) for 8 s

Short press to activate LED

Low battery / Hardware error

Fast flashing (100 ms on / 100 ms off) for 8 s

Programming mode

Constant on during programming mode and timeout after 4 minutes.

Power consumption is higher in programming mode.

Short press to activate LED, then short press within 8 s to enter programming mode 2) 3)

Response for button press

Constant on until users stop pressing within 2 s

Short press to active

Off and green

Firmware update

Constant off during firmware download, fast flashing (100 ms on / 100 ms off) during new firmware startup.

N/A

Notes

1) Device is in initial state (no connection).

2) Before entering programming mode, connect device to Thread network.

3) Device can enter programming mode via gateway. The icon for programming mode in gateway web UI is Device Identification locates in KNXIOT GATEWAY ⇒ Device Management ⇒ Configuration ⇒ Maintenance Commands.

4) Reset the device if connection is lost (LED flashes red) and the device must rejoin the network.