Union CWD2005 DPC, Руководство по эксплуатации

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CWD2005 DPC
Maintenance and service
chapter — page: 8—13
8.5 Changing / replacing fuses
Fuses may only be exchanged by an electrician or service professional. Choose
the type approved by UNION Instruments.
8.6 Instable measured value
•
The pressure regulator cannot hold constant pressure. The process pressure
(blast furnace gas) is too low. A pressure increase pump must be installed.
•
Direct sunlight causes rapid changes in temperature. Avoid direct sunlight.
•
Temperature changes too rapid due to the air conditioning system. The power
of the air conditioning is too high and the hysteresis is too large.
•
The pressure is imprecise and/or cannot be held.
Check if the input pressure is too high.
8.6.1 Drift of the measured value
The measured value drifts up in one direction:
The calibration does not reach the required point anymore. The frequency control-
ler has reached its maximum value.
Heavy filter soiling which cannot be compensated by controller anymore. Replace
the filter.
The measured value drifts down:
The heat exchanger is sooty (in case of propane, butane combustion with insuffi-
cient air).
Clean the heat exchanger (warm water). Then dry with compressed air.
8.6.2 Faulty ignition
The combustion calorimeter ignites permanently, the flame is burning. Combustion
calorimeter does not enter operating mode.
Incorrect temperature setting (too high). Lower the temperature threshold.
The combustion calorimeter switches to operating mode even though the flame
does not burn and then returns to ignition mode.
Incorrect temperature setting (too low). Increased the temperature threshold.
Ignition electrode corroded, normal wear after frequent ignition.
Replace ignition electrode.