ST100A Series Flow Meter OPERATION
Fluid Components International LLC 87
External Control Group Switching (EGS)
This mode automatically changes the ST100A Series calibration group based on a 4-20 mA output current from another device fed into the
ST100A Series 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.
Figure 65 – External Control Group Switching (EGS) Setup Screen
Select the Group Switch Setup tab.
In the window’s External Control Group Switching Setup field, assign a calibration group as desired to
the min. (4 mA) and max. (20 mA) input values via the associated Group drop-down list. Similarly, define up to 4 points within the range by
entering an input value in the text box and assigning it a calibration group via the associated Group drop-down list. 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 configurator’s Process Data screen will now display “EXTENDED OP MODE EGS” in the upper left corner (see Figure 66). The
optional front panel display also shows EGS on the Group Number line after the display is refreshed. Refresh the front panel display by
cycling the power to the unit or covering the Hot Key (HMI option) for 3 seconds.
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