Emerson Exchange 365

Vicken,

We should be able to help you with a bit more information.  Can you tell me the following:

1. What flow rates are you operating at?
2. How did you zero the meters?
3. What output are you using?
4. Are you using the interal totalizer?
5. What temperature are you operating at?
6. What are the batch totals for both the scale and the meter?
7. Is the meter always full, or does it fill and drain during the course of a batch? 

The vibration you've identified is not likely to be contributing to the measurement error unless it is closely matched to the drive frequency of the meter.  Do you have a sense of what the pulsation frequency from the pump is?

Best Regards,

Dave Kuhny

Dave Kuhny  |  Measurement Technology Test Group Manager |  Micro Motion Inc. 

Emerson Process Management 

In reply to dkuhny:

Thank you Dave for your reply, I have mounted the F200/1700 as it was received from the auction without doing any changes in parameters or configuration, except for the imperial to metric value conversion. So I have not done any zero-ing. the densities of our different juice types vary between 1 and 1.06gm/cm3 and the flow rate of the driving pump is around 12500L/hr. The F200 was originally used for a two phase carbonated soft drink plant in England.
At the moment, I am taking the batch readings right from the 1700 screen and reseting readings between batches without draining the flow meter in between. Our batch sizes are consistent at 3785 Liters/batch (with the test product mentioned earlier this was 3985Kg), but when sent through the F200 to a secondary tank, the readings on the 1700 varied between 3875Kg and 4380kg for the 5 test batches! (These are the extreme deviations of -2.99% and +7.77% mentioned ealier). I must say that during the flow of the juice I witnessed alternate blinking of the orange and green lights. I suspect that the tube is being filled with air momentarily, but I am not sure because I have not been able to read the type of the alarms reported.
Best regards
Vicken

In reply to Marc Buttler:

Thanks Marc for your suggestions. As a matter of fact, the issue of bubbles in the product seemed to be quite correct, we had pockets of air that were traveling along with the product, especially at instances when batch preparation tanks were switched between. We have added a non-return vlave before the F200 and henceforth readings have been more consistent with a slight variation of about 45-50Kg over the entire batch of 3990Kg (error = 1.25%). However, at the end of each batch I am getting a number of alarm codes, which after reseting, they keep coming up again at the end of the next batch. The codes are A100 (mA Output 1 Saturated), A102 (Drive overrange), and A105 (Slug Flow). Is there anything I can do to prevent these alarms from coming ON. Will that solve my variation issue too?
regards
Vicken