Some data missing in Lookout, but present at device

[williams]

We are using Lookout 3.8 to individually poll 20 channels of temperature data from Yokogowa chart recorders. Data from 10 of 20 of those channels is not present for a long period of time (over a year). No error messages were received. The data was present on the chart recorders for the same time period. For the channels that are missing, the data is blank, not even a number 3238 - which we get when the thermocouple is not connected.

Any ideas as to why some previous data may be missing? The system is still running and all channels now have continuous data for the past few weeks, although data is still missing from the earlier time period.

Thanks for your help.

[Kristi_P]

It's difficult to say exactly why those channels did not log any data. As you know, Citadel only logs data if it changes beyond the specified deadband. Is there any other information you could provide?

If you're concerned about the reliability of future datalogging, I recommend that you upgrade to Lookout 5.1. National Instruments has not supported Lookout 3.8 for several years. Newer versions of Lookout use Citadel 4 which offers significant improvements to the stability of the database.

Regards,

Kristi H
Applications Engineer
National Instruments