# Question for the whole community: strange behavior of 2 sensors at the same place **URL:** \ **Category:** Uncategorized\ **Created:** [December 25, 2021, 6:41pm UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110 "2021-12-25T18:41:27Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![pjg](https://forum.sensor.community/user_avatar/forum.sensor.community/pjg/32/194_2.png) [@pjg](https://forum.sensor.community/u/pjg)\ **Post date:** [December 25, 2021, 6:41pm UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/1 "2021-12-25T18:41:27Z")
Have you ever seen this ? 3 sensors were tested by Respire in Paris. They were connected to a WiFi network in the Respire office and everything worked well : values around 10/15 ug/m3 for 2 hours. The 3 sensors were then brought to a school were they will be used as indoor sensors. They were connected to this new WiFi network: 1 sensor gives normal results, the 2 others stay at 0 for the past 2 days. Actually a fourth one appeared as already registered and also gives 0… It is not on the map yet but same behavior according to the `https://api-rrd.madavi.de/grafana/d/GUaL5aZMz/pm-sensors?orgId=1&var-chipID=esp8266-[ID]` I f some one can explain me why, he/she will receive my grateful christmas thoughts. [https://maps.sensor.community/#16/48.9192/2.3326](https://maps.sensor.community/#16/48.9192/2.3326) Sensors: - 68708 - 68702 - 68704 I asked 10 times the same questions to the people there. Everything seems to be normal in the classroom. ---
**Author:** ![air-ais](https://forum.sensor.community/letter_avatar_proxy/v4/letter/a/ad7895/32.png) [@air-ais](https://forum.sensor.community/u/air-ais)\ **Post date:** [December 25, 2021, 7:06pm UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/2 "2021-12-25T19:06:23Z")
Could it be a power issue? ---
**Author:** ![pjg](https://forum.sensor.community/user_avatar/forum.sensor.community/pjg/32/194_2.png) [@pjg](https://forum.sensor.community/u/pjg)\ **Post date:** [December 25, 2021, 8:47pm UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/3 "2021-12-25T20:47:36Z")
Indeed. I forgot to ask about this. Thanx a lot. ---
**Author:** ![Denis](https://forum.sensor.community/letter_avatar_proxy/v4/letter/d/5e9695/32.png) [@Denis](https://forum.sensor.community/u/Denis)\ **Post date:** [December 26, 2021, 9:16pm UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/4 "2021-12-26T21:16:42Z")
Check that the outlet tube is not blocked! ---
**Author:** ![pjg](https://forum.sensor.community/user_avatar/forum.sensor.community/pjg/32/194_2.png) [@pjg](https://forum.sensor.community/u/pjg)\ **Post date:** [December 27, 2021, 7:54am UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/5 "2021-12-27T07:54:11Z")
No outlet tube it is a pms7003. I asked but I don t know if the French can understand me… ---
**Author:** ![Herve5](https://forum.sensor.community/letter_avatar_proxy/v4/letter/h/85f322/32.png) [@Herve5](https://forum.sensor.community/u/Herve5)\ **Post date:** [January 1, 2022, 5:28pm UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/6 "2022-01-01T17:28:52Z")
@pjg Pierre-Jean, ce samedi 1er je ne vois que _ **deux** _ senseurs connectés sur la carte, [cf mon écran](https://imgur.com/ag3mvEU.png). Si tu as transporté les appareils, est-il possible que le connecteur intérieur entre la carte mère et le détecteur lui-même se soit déconnecté? Que dit le “tableau de bord” du senseur, celui où tu vois la valeur de mesure, etc. qui ressemble [à ça](https://imgur.com/3OChN6F.png)et dont l’url commence par [https://devices.sensor.community/sensors/](https://devices.sensor.community/sensors/)[ton numéro de senseur] ? (ceci sachant que le site de sensor.community est parfois très lent à répondre, il faut peut-être recharger la page) Selon moi, - si tu as une valeur zéro au tableau de bord, il y a un problème de mesure dans le senseur - si tu ne vois pas du tout le tableau de bord, c’est que le senseur n’arrive pas à se connecter… et dans ce cas notamment ce peut être “juste” parce que le signal wifi est trop faible, par exemple… ---
**Author:** ![pjg](https://forum.sensor.community/user_avatar/forum.sensor.community/pjg/32/194_2.png) [@pjg](https://forum.sensor.community/u/pjg)\ **Post date:** [January 1, 2022, 8:30pm UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/7 "2022-01-01T20:30:33Z")
Les 3 sont bien là. Je viens de vérifier. Sur devices… c est pareil. En cas de déconnexion de la prise il ne devrais rien y avoir : - A la rentrée Tony le président de Respire va y retourner… ---
**Author:** ![Herve5](https://forum.sensor.community/letter_avatar_proxy/v4/letter/h/85f322/32.png) [@Herve5](https://forum.sensor.community/u/Herve5)\ **Post date:** [January 2, 2022, 6:51am UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/8 "2022-01-02T06:51:04Z")
OK tu vois les trois sur devices.etc donc ils sont alimentés et connectés à internet. Je dirais que c’est peut-être bien le connecteur interne qui relie le détecteur à la carte-mère qui s’est partiellement déconnecté, durant le transport s’il y a eu des chocs… P. S. tu as de la chance d’être en contact direct avec Respire; de mon côté n’étant pas toujours à Paris j’ai commandé un détecteur mais j’ai raté leur distribution… et je n’ai aucune réaction à mes mails… ---
**Author:** ![pjg](https://forum.sensor.community/user_avatar/forum.sensor.community/pjg/32/194_2.png) [@pjg](https://forum.sensor.community/u/pjg)\ **Post date:** [January 2, 2022, 9:14am UTC](https://forum.sensor.community/t/question-for-the-whole-community-strange-behavior-of-2-sensors-at-the-same-place/1110/9 "2022-01-02T09:14:49Z")
Ça m etonne que ça se soit déconnecté. J ai participé à la conception du capteur Respire et pour décrocher une quadruple broche il faut le vouloir… Envoie-moi l adresse Mail je peux essayer de faire quelque chose.