ST100 Series Flow Meter OPERATION
Fluid Components International LLC 31
External Control Group Switching (EGS)
This mode automatically changes the ST100 calibration group based on a 4-20 mA output current from another device fed into the ST100
Auxiliary Input port.
Start the application. Click USB Connect on the home screen. Select the Configuration branch from the menu tree on the window's left side.
Select the Extended Op. Mode tab. Click Toggle System Mode. Enter user level password 2772 at the prompt. Verify that instrument is in
the service state with Setup showing in System Mode field. Click External Control Group Switching (EGS) radio button.
External Control Group Switching (EGS) Setup
Select the Group Switch Setup tab. In the window’s External Control Group Switching Setup field, specify a 4-20 mA input value in the text
box and and its calibration group assignment via the associated Group drop-down list (define up to 5 points starting with the lowest value at
the bottom). These entries determine which calibration group is active as the auxiliary input current varies. The EGS setup field's Reset button
provides a quick way to clear out all programming entries (mA value/calibration group assignment).
Click Send to Device to send the EGS programming to the instrument. Return to normal operation by selecting the Extended Op. Mode tab
and clicking the Toggle System Mode button (observe that System Mode field shows Running).
The Process Data screen on the ST100 configuration application will now display “EXTENDED OP MODE EGS” in the upper left corner. The
HMI display also shows EGS on the Group Number line after the HMI is refreshed. Refresh the HMI display by cycling the power to the unit
or covering the Hot Key for 3 seconds.
Example Process Data Screen with EGS Mode Shown
Group Switching Criteria,
4-20 mA Input Current
Group Switching Based on
Input Current
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