TROUBLESHOOTING ST100 Series Flow Meter
36 Fluid Components International LLC
General Function Check
The ST100 series thermal mass flow meter is available in various configurations; this troubleshooting section covers ST100 Single point remote
Analog (4-20mA/HART) ST100 Single point remote Digital bus output.
Tools Needed
• Digital Multimeter (DMM)
• ST100 Configuration Software Application
• USB Cable Standard Type A/Standard Type A (MM)
• Two Decade Resistance Boxes with resolution from 0.01 to 9999.99 ohms
• Allen Wrench 1/16 inch
• Small size flat blade screwdriver (for sensor wiring connection)
Setup Verification
Connect the flow meter via USB to a computer or laptop running the ST100 configuration software supplied with the instrument. See the
ST100 configuration software manual for details.
Confirm the setup of the flow meter going through the setup windows in the configurator. Verify that the displayed information matches the
parameters printed on the dR sheet parameter table. Contact your local representative or FCI for instructions if setup doesn’t match.
NAMUR Fault Indication
NAMUR NE43 is a German fault detection standard that lets the user know if there is a fault within the instrument by forcing the 4-20 mA
output current outside the normal operating range of the instrument.
The NAMUR is turned on or off with the ST100 configuration software application only. The HMI cannot access NAMUR.
Click USB Connect on the home screen. Select the Configuration branch from the menu tree on the window's left side. Select the 4-20mA
User tab. Click on the NAMUR Enabled checkbox.
In the window's NAMUR field, define the NAMUR output level by clicking either Set NAMUR @ 3.6 mA or Set NAMUR @ 21.0 mA. Click Send
to Device to save the settings to the instrument. To discard changes, exit the screen without clicking Send to Device.
NAMUR Output Level Selection
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