KROHNE OPTIMASS with MFC 300 EN User Manual
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11.1 Diagnostic functions
The following diagnostic functions are available in the TEST level Menu B2.
Temperature (menu B2.6):
•
Displays temperature in either oC or oF. The value should be stable.
Strain (menu B2.7 Strain measuring tube / B2.8 Strain inner cylinder):
•
Value of strain in Ohms. The values should be in the range stated in section 10.3. Wildly
unstable value even after temperature stabilisation: the strain gauge has possibly become
delaminated due to the meter being operated over maximum temperature for prolonged
periods of time (please contact KROHNE UK service department).
Frequency (menu B2.9):
•
Variations in the first digit after the decimal point indicate gas or air in the fluid.
•
Worn or eroded flow tube: frequency will increase by around 2...4 Hz meter requires re-cal-
ibration
•
Coatings can also alter the frequency
•
Large fluctuations are seen if the meter is in ‘Start Up’
Drive Energy (menu B2.10):
Typical values for the drive energy level with water as process fluid (with no air or gas) are:
Higher drive energy levels can occur due to gas or air in the fluid or at the measurement of
high viscous fluids or fluids with high densities.
Sensor A and B (menu B2.11, B2.12):
The displayed value should be around:
•
80% for OPTIMASS 7000 – sizes 06 … 40, OPTIMASS 8000, OPTIMASS 9000
•
60% for OPTIMASS 7000 – sizes 50 and 80
•
55% for OPTIMASS 3000 - all sizes
•
60% for OPTIMASS 2000 - size 100
•
50% for OPTIMASS 2000 - size 150 & 250
•
80% for OPTIMASS 1000
NOTE: Sensor values should be within 2% of each other.
2-Phase Flow (menu B2.13):
This function gives an indication of the 2-phase signal level of the unit. This is application and
process dependent and it can be used to determine the set point for the 2-phase flow alarm
function. This can only be done on-site under actual flowing conditions.
SE Board Temperature (menu B2.14):
Displays the temperature of the sensor electronics
BE Board Temperature (menu B2.15)):
Displays the temperature of the converter electronics
OPTIMASS
11
SERVICE & TROUBLE SHOOTING
OPTIMASS 1000:
All sizes
0...6
OPTIMASS 2000:
All sizes
0...5
OPTIMASS 3000:
all sizes:
0...4
OPTIMASS 7000 :
06...40
50...80
0...6
4...10
OPTIMASS 8000:
all sizes:
0...5
OPTIMASS 9000:
all sizes:
0...5