5
EM50
2.4.1 EM50 SERIES DATA LOGGING SCHEME
The Em50 does not make sensor measurements until you set a measurement interval. You
also need to configure the Em50 ports with the type of sensor plugged into each port. You
can set these values using either ECH2O Utility or DataTrac3.
2.4.2 EM50 MEASUREMENT INTERVAL
The measurement interval controls how often the Em50 records data 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-h clock. For
example, if you choose a measurement interval of 120 min, the Em50 stores data every
2 h, 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 interval greater than 720 results in one
set of data stored per day. For most applications, a measurement interval of 60 or 120 min is
appropriate.
NOTE: Setting the Em50 measurement interval to zero turns off sensor measurement and data storage.
For most sensor types, the Em50 makes a measurement from each of the five sensor ports
every 60 s, regardless of the measurement interval value. When the Em50 internal clock
reaches the user-programmed measurement interval, the Em50 stores the average of all
the 60-s 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-h period.
NOTE: The Em50G supports 5 min as the minimum value for the measurement interval setting.
2.5 HOW THE EM50 STORES DATA
2.5.1 DATA STORAGE FORMAT
The Em50 stores raw data for each sensor. The stored values are not in millivolt units. Please
review your individual sensors operators manual or visit metergroup.com for up to date
equations to convert raw data to meaningful sensor values.
The Em50 stores data for all five sensor ports for each measurement interval. If no sensor
is connected to one or more of the logger ports, the Em50 stores a "0" for that port. The
Em50 data memory is nonvolatile flash. Removing the batteries or performing a system reset
does not erase your data.
Removing batteries or resetting the system also resets the clock in the data logger. To set
the clock to the correct time, simply connect your Em50 to a computer or handheld device
running ECH2O software.
To Next Page
Loading...
Need help?
General
