How The Em50 Stores Data - Decagon Devices EM50 Operator's Manual

2 ABOUT THE EM50 LOGGER SERIES Em50 Series
to internal data storage. The interval you choose applies to all five
ports on the Em50. So, it is impossible to have one port measuring
sensors more or less frequently than another port.
The measurement interval works relative to the Em50 internal real-
time, 24-hour clock. For example, if you choose a measurement in-
terval of 120 minutes, the Em50 stores data every two hours, on
the hour. The resulting data shows sensor measurements hourly at
12:00 a.m., 2:00 a.m.,..., 10:00 p.m. Choosing a measurement inter-
val greater than 720 results in one set of data stored per day. For
most applications, a measurement interval of 60 or 120 minutes is
appropriate.
Note: Setting the Em50 measurement interval to zero turns off sen-
sor measurement and data storage.
For most sensor types, the Em50 makes a measurement from each
of the five sensor ports every 60 seconds, regardless of the measure-
ment interval value. When the Em50 internal clock reaches the user-
programmed measurement interval, the Em50 stores the average of
all the 60-second sensor readings taken since the last storage interval.
Therefore, if you set the measurement interval to 60, the Em50 stores
an average of the past 60 sensor readings. If you choose an interval of
1,440, the Em50 stores one value that represents the average sensor
value for the entire 24 hour period.
Note: The Em50G supports five minutes as the minimum value for
the measurement interval setting.
2.5

How the Em50 Stores Data

Data Storage Format
Note: The Em50 stores raw data for each sensor. The stored val-
ues are not in millivolt units. Please review your individual sensors
operators manual or visit our website (www.decagon.com) for up to
date equations to convert raw data to meaningful sensor values.
8