Title: 370.011 OE501 Siemens Sitrans FUE080 Flowmåler.pdf
SITRANS FUS080 transmitter58Operating Instructions, 07/2012, A5E03059912-02Troubleshooting/FAQs 9.2 Diagnosing with PDMGain step error conditionsConditionCause15No transducer (e.g. defective cable)Empty pipeHigh valuesHigh damping (e.g. inhomogeneous media)Unsuitable mediumPath angular misalignmentUnstable/fluctuating valuesAir bubbles or solids in mediumBad inlet conditionsΔ gain step between path 1 and path 2 > 1 (2-path systems only)Bad inlet conditionsInhomogeneous mediumPath angular misalignmentIn case of angular misalignment between transducer faces, the gain step will increase as shown in the table below:Angular misalignmentGain step increase2°13°24°35°5Flow velocity error conditionsConditionCauseΔ flow velocity values (between path 1 and path 2) > 1 (2-path systems only)Bad inlet conditions (the higher the delta, theworse the inlet conditions)Disturbances in the pipe (bad flow profile)Unstable/fluctuating values