# This sensor is already registered

**URL:** https://forum.sensor.community/t/this-sensor-is-already-registered/2941
**Category:** Uncategorized
**Created:** [August 19, 2024, 5:34pm UTC](https://forum.sensor.community/t/this-sensor-is-already-registered/2941 "2024-08-19T17:34:30Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Jan\_van\_Bemmelen](https://forum.sensor.community/user_avatar/forum.sensor.community/jan_van_bemmelen/32/1687_2.png) [@Jan\_van\_Bemmelen](https://forum.sensor.community/u/Jan_van_Bemmelen)
#### Post date: [August 19, 2024, 5:34pm UTC](https://forum.sensor.community/t/this-sensor-is-already-registered/2941/1 "2024-08-19T17:34:30Z")

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I’m trying to register device 4522171 but get a “This sensor ID is already registered.” error message. Would you please release the ID?

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### Author: ![ricki-z](https://forum.sensor.community/user_avatar/forum.sensor.community/ricki-z/32/215_2.png) [@ricki-z](https://forum.sensor.community/u/ricki-z)
#### Post date: [August 20, 2024, 4:49am UTC](https://forum.sensor.community/t/this-sensor-is-already-registered/2941/2 "2024-08-20T04:49:30Z")

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@Jan_van_Bemmelen Please check that only one sensor per sensor type is registered. It’s not possible to register i.e. 2 SDS011 on one NodeMCU. This would lead to the same error message.  
The chipID itself is not registered yet.