Aquametro Oil & Marine Viscosity VC312, Инструкция по установке и эксплуатации

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18 VCS – Viscosity Controller
6.2 Process troubleshooting
Problem Possible causes Recommended actions
Viscosity reading
oscillating
Normal process noise
Two-phase flow
Deposition or coating, especially
asphaltenes, on the tines
Contaminants in the process fluid
Vibration in the pipeline
Check your process conditions.
Check for two-phase flow,
stratification, or settling. Install a
pump. Check for environmental
conditions that produce stratification
(e.g., a heat source).
Increase back pressure to minimize
bubble formation.
Clean the tines.
Minimize vibration in the pipeline.
Energy level in heating system to low Check whether other consumers
cyclically draw energy
Steam Valve oscillating Wrong adjustments of control loop
Adapt control loop (Increase P – check
if necessary increase I / small steps for
the changes)
Viscosity signal
too low /
Temperature not
reached
Air entrapped in fuel oil system Vent the system at the bypass valve
Heat Valve not fully opened Adapt Control Loop parameter
Heat Valve close to max. Position Steam system power at max
Viscosity Signal
remains at
maximum Value
Fuel too cold during start up Check fuel line trace heating ans or fuel
heater
Fuel too cold during normal operation
due to insufficient heating
Increase output signal of controller to
hear exchanger.
Consult AOM if this does not solve the
problem
No Viscosity
/Temperature
Signal
Air entrapped in fuel oil system Vent the system
No Electrical supply to viscosity sensor Check main Supply
Check fuses of control unit/power
supply unit
Check integrity of electrical
connection
Current loop connection broken Check electrical wiring of 4-20mA
output signal
Viscosity sensor malfunction Contact AOM
To balance any appearing deviation as quickly a non-oscillation operation conditions of the PID Loop is required.