[Observium] how to create custom sensor threshold for some devices?

Hi

I am running Observium Professional an im havving an issue with some sensors in our environment

I have a sensor that is always generating an alert:

Index: hh3cEntityExtTemperature.112 Class: temperature min: 0 degrees max: 0 degrees current: 40 degrees

I have many of them on one device i.e.:

hh3cEntityExtTemperature.112 hh3cEntityExtTemperature.122 hh3cEntityExtTemperature.262 hh3cEntityExtTemperature.267

Additionally, all switches of this kind are producing the alerts since they all have the indexes and the incorrect threshold.

How can i set a custom threshold that is valid for all of these switches and Indexes (the indexes are equal on all of the switches)?

Best, Thomas