When the batteries are exhausted in my PM2.5 Outdoor Monitor, the data, not surprisingly, drops off. There is no data at all; the chart for its values is blank.
I am running my WS2000, sending data to WeatherUnderground.net
I want to set an alert for this NO DATA condition. With the Ambient Weather web site I can set alerts to be sent when data values are either greater than or less than a certain value. But I don't see anything about triggering an alert when there's NO DATA - i.e. batteries out. It’s not exactly any value less than or more than, which are all that the alert-system allows me to set up. So what can I do to get an SMS or EMAIL alert when the batteries run out?