TROUBLESHOOTING ST80/ST80L Flow Meter
82 Fluid Components International LLC
If the instrument has been off for some time, the resistance of the active RTD will be the same as the reference RTD.
For Remote Units – If the measured resistances correspond to Table 28, but not to Table 27, then the sensor interconnect cable is
probably defective. Replace the cable and recheck resistances. If the resistances are still off, contact Customer Service.
If the measured values do not correspond to Table 27 or Table 28 (for remote units), then the flow element is defective. Contact Customer Service.
Reinstall the sensor plug(s) and reattach the cables when troubleshooting is complete.
Check the Heater
Use the configuration software to check the heater as follows (refer to the ST80/ST80L Configuration Software manual 06EN003491 for
software details):
1. Access the Heater Values tab from the Diagnostics branch of the menu tree. See Figure 59 below.
2. Click Start Data Loop. Note that the button changes color when clicked (light green to light orange).
3. Verify that the displayed values for Heater Resistance, Heater Voltage, and Heater Current mA are within normal parameters.
Click Stop Data Loop when done. See Table 29 below.
Table 29 – Nominal Heater Parameter Ranges
108-120 Ω
Figure 59 – Example Heater Values Tab (Diagnostics)
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