KROHNE MFC 400 EN - Manual (Page 115)

OPERATION
6
115
MFC 400
www.krohne.com 08/2013 - 4002075802 - MA MFC 400 R02 en
6.8 Diagnostic functions
The following diagnostic functions are available in test menu B2.
6.8.1 Temperature (menu B2.7)
Temperature display in °C or °F.
• This value should be steadily displayed.
• Unstable values may mean a faulty Pt500 or that liquid is in the outer housing.
6.8.2 Frequency (menu B2.10)
• Fluctuation in the first decimal places indicate gas or air bubbles in the product.
• Worn or eroded measuring tube: frequency increases by around 2…4 Hz; recalibration
required.
• Formation of a coating can reduce vibration frequency, depending on the type of coating and
the layer thickness. If, however, the density of the coating is the same as for the flowing
medium, no frequency is observed.
• Large fluctuations in frequency occur in the "start-up" phase.
6.8.3 Drive level (menu B2.11)
Display of the drive energy in percent.
Typical values for drive energy in water and with no gas inclusions
6.8.4 Sensor levels A and B (menu B2.12, B2.13)
Normal display values:
• 80% for OPTIMASS 6000 standard and cryogenic version
• 60% for OPTIMASS 6000 HT version
6.8.5 2 phase signal (menu B2.14)
The value of the 2 phase signal can be read in this function. For applications that must detect 2
phase flow, an alarm level can be programmed. This alarm level depends on the application and
the process and can thus only be set on-site under current operating conditions during flow. For
detailed information refer to
2 Ph. Threshold (menu C1.5.3) on page 100.
OPTIMASS 6000 All sizes 0...1
INFORMATION!
Higher values for drive energy can occur when the product contains air or gas bubbles or when
measuring products with high viscosity or density.
INFORMATION!
The sensor levels for A and B should not differ by more than 2%.
.book Page 115 Monday, August 26, 2013 9:05 AM