KROHNE MFC 300 EN - Manual (Page 118)

6
OPERATION
118
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 en
6.7 Function tests and troubleshooting
Min. and max. recorded temperature (menu C1.5.1 / C1.5.2) Min. and max. recorded temperature (menu C1.5.1 / C1.5.2) Min. and max. recorded temperature (menu C1.5.1 / C1.5.2) Min. and max. recorded temperature (menu C1.5.1 / C1.5.2)
Stores the minimum and maximum value for the temperature occurring during sensor operating
time.
Application problems that may indicate errors in the signal converter:
• An improperly closed shut-off valve during zero calibration results in high calibration values
• Air/gas bubbles result in high energy levels and high calibration values
• Product deposits on the inside of the measuring tube lead to higher/lower density indications
and high calibration values
Common errors (with corresponding symptoms):
• Slightly eroded or corroded measuring tube
- Erroneous density measurement
- High frequency
- Measurement error at low mass flow
• Eroded or corroded measuring tube (product in the housing)
- Measuring tube does not start
- Low resistance to earth with conducting product
• Open circuits from activation and sensor coils, resistance thermometers (RTD) or strain
gauge
- Can be measured with ohmmeter
Sensor type Operating temperature
Minimum Maximum
OPTIMASS 1000 -40°C / -40°F 130°C / 266°F
OPTIMASS 2000
OPTIMASS 3000
(Stainless steel or Hastelloy
® )
-30°C / -22°F 150°C / 302°F
OPTIMASS 7000 (titanium) -40°C / -40°F 150°C / 302°F
OPTIMASS 7000
(Hastelloy
® /tantalum)
0°C / 32°F 100°C / 212°F
OPTIMASS 7000 (stainless steel) 0°C / 32°F 100°C / 212°F
130°C / 266°F
OPTIMASS 8000
(depends on version)
-195°C / -310°F 230°C / 446°F
.book Page 118 Monday, February 6, 2012 11:01 AM