Proline Promass 83E/F/O Operation Manual - FMC Technologies

Troubleshooting Proline Promass 83äNo. Error message / Type Cause Remedy (spare partä 95)No. # 7xx Other process errors)700 P: EMPTY PIPE!: # 700The process fluid density is outside the upper or lowerlimit values set in the EPD functionCauses:– Air in the measuring tube– Partly filled measuring tube1. Ensure that there is no gas content in the process liquid.2. Adapt the values in the EPD function to the current processconditions.701 P: EXC. CURR. LIM!: # 701702 P: FLUID INHOM.!: # 702The maximum current value for the measuring tubeexciter coils has been reached, since certain process fluidcharacteristics are extreme, e.g. high gas or solidcontent.The instrument continues to work correctly.Frequency control is not stable, due to inhomogeneousprocess fluid, e.g. gas or solid content.In particular with outgassing fluids and/or increased gas content,the following measures are recommended to increase systempressure:1. Install the instrument at the outlet side of a pump.2. Install the instrument at the lowest point of an ascendingpipeline.3. Install a flow restriction, e.g. reducer or orifice plate,downstream from the instrument.703 P: NOISE LIM. CH0!: # 703704 P: NOISE LIM. CH1!: # 704Overdriving of the internal analog to digital converter.Causes:– Cavitation– Extreme pressure pulses– High gas flow velocityA continuation of the measurement is still possible!Change or improve process conditions, e.g. by reducing the flowvelocity.705 P: FLOW LIMIT$: # 705The mass flow is too high. The electronics' measuringrange will be exceeded.Reduce flow731 P: ADJ. ZERO FAIL!: # 731The zero point adjustment is not possible or has beencanceled.Make sure that zero point adjustment is carried out at "zero flow"only (v = 0 m/s). ä 77Page 92 • MN0M022Issue/Rev. 0.2 (12/12)