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Section 4: Troubleshooting
4.1
Symptom Chart
No Signal Received at controller
Output is Under 4mA
Output appears erratic
Output appears to be going
down, yet tank is filling
Output appears to be going up,
yet tank is emptying
4.2
Internal Diagnostics
4.2.1
During Normal Operation:
4.2.2
"Lost Float" Diagnostic:
Symptom
• Check that power is applied to controller
• Check wiring connection to probe
• Check process temperature [cannot exceed 230ºF (110ºC)]
• Be sure float is in place and not stuck.
• Be sure float retention clip is in place at base of probe
• Check automatic gain control (if output is 3.8mA)
• Be sure probe is mounted perpendicular with gravity
• Check float for free movement along probe
• Check automatic gain control
• Check configuration of 4mA & 20mA points
• Check configuration of 4mA & 20mA points
(All diagnostic values with tolerances ±0.02 mA)
1. Absence of Magnet Signal, Wire Break, or float outside active
range is Indicated as 3.8 mA
2. Selected Span beyond 4 mA Set Point is indicated as
3.9 mA
3. Selected Span beyond 20 mA Set Point is indicated as
20.1 mA
When Float gets stuck beyond span or active ranges, or end
cap falls off and float slips away from probe, then outputs will
indicate as shown to the right.
20.1mA
3.9mA
29
Troubleshooting Tip
3.8mA
3.8mA
Troubleshooting
Figure 4-1
Built-in Diagnostics
Locate Float Position
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