KROHNE OPTIMASS with MFC 300 EN - Manual (Page 132)

132
Zero Problems
• Perform auto zero, observe the displayed value, it should be stable and lower than +/- 0.5%
• If the result is bad carry out the following procedure:
1. Stop flow
2. Set totaliser function (C4.y.1) to Absolute Total
3. Set totaliser low flow cut off (C4.y.3) to 0
4 Set Low Flow cut off (C1.3.5) to 0
5. Perform auto zero
6. Reset total and totalise over 2 minutes.
7. Compare totalised flow to specified zero stability.
For best process results, zero setting should be performed on process fluid at process tem-
perature.
High zeros can be caused by:
• Leaking valves
• Air/Gas inclusions
• Coating on tube.
Typical Frequency values (at 20oC / 68oF)
Model Size
Titanium Stainless Steel Hastelloy
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
1000-15 443 ± 3 451 ± 3
1000-25 598 ± 3 518 ± 3
1000-40 485 ± 3 406 ± 3
1000-50 577 ± 3 448 ± 3
2000-100 350 ± 10 270 ± 10
2000-150 325 ± 10 255 ± 10
2000-200 300 ± 10 230 ± 10