KROHNE OPTIMASS Series - Zero Problems; Driver or Sensor Coil Fault

Installation and Operating Instructions OPTIMASS
95
6.3 Functional Tests and Troubleshooting
Min. and Max. recorded temperature (menu 5.4):
Records the maximum values of temperature and strain as experienced by the transducer.
Maximum Minimum
OPTIMASS 7000 - Titanium 150°C or 302°F -40 °C or –40°F
OPTIMASS 7000 - Hastelloy 100°C or 212°F 0°C or 32°F
OPTIMASS 7000 – SS
Optional
100°C or 212°F
130°C or 266°F
0°C or 32°F
OPTIMASS 3000 (7100) –
SS or Hastelloy
150°C or 302°F –30 °C or –22°F
OPTIMASS 8000 *
(Depending on variant)
230°C or 446°F –180 °C or –
292°F
Max. operating temperature:
OPTIMASS 9000 350°C or 662°F 0°C or 32°F
Application problems that appear to be Transducer Faults
• Leaky Valves will cause high zeros
• Entrained Air/gas will cause high energy levels and high zero
• Product coating on the inside of the tube will cause high/low density and high zero
The following faults have occurred (listed below with their symptoms):
Beware:
Application problems can cause similar symptoms, check this first!
Tube bore slightly eroded or corroded
• Density Low
• Frequency High
• Small Mass Flow Errors
Tube eroded or corroded through (fluid in housing)
• Tube will not start
• If fluid conductive - low resistance to ground
Open Circuit Drivers, Sensors, RTD’s and Strain Gauges
• Detectable with Ohm meter
Typical Frequency values ( at 20°C / 68°F)
Titanium SS Hastelloy
Model Size
Empty Water Empty Water Empty Water
3000 - 01 137 ± 3 133 ± 3 141 ± 3 137 ± 3
3000 - 03 137 ± 3 133 ± 3 141 ± 3 137 ± 3
3000 - 04 195 ± 5 185 ± 5 195 ± 5 185 ± 5
7000 - 06 316 ± 10 301 ± 10 374 ± 6 361 ± 7
7000 - 10 402 ± 10 367 ± 10 419 ± 15 394 ± 15 439 ± 7 415 ± 6
7000 - 15 507 ± 7 436 ± 6 573 ± 15 514 ± 15 574 ± 27 517 ± 27
7000 - 25 619 ± 6 488 ± 6 701 ±10 589 ± 10 693 ± 10 586 ± 10
7000 - 40 571 ± 6 415 ± 6 642 ± 10 509 ± 10 633 ± 6 506 ± 6
7000 - 50 539 ± 5 375 ± 5 550 ± 14 435 ± 14 582 ± 11 453 ± 11
7000 - 80 497 ± 5 349 ± 5 502 ± 10 378 ± 12 492 ± 12 369 ± 12
8/9000 – 15 146 ± 3 136 ± 3 146 ± 3 136 ± 3
8/9000 - 25 181 ± 3 162 ± 3 181 ± 3 162 ± 3
8/9000 - 40 192 ± 3 164 ± 3 192 ± 3 164 ± 3
8/9000 - 80 119 ± 3 101 ± 3 119 ± 3 101 ± 3
8/9000 - 100 149 ± 3 117 ± 3 149 ± 3 117 ± 3