Vega VEGABAR 82 Operating Instructions Manual

Also see for VEGABAR 82: Product information Operating instructions Quick setup guide Operating instructions Operating instructions

Contents

508 Diagnosis, asset management and serviceVEGABAR 82 • 4 … 20 mA45027-EN-131010Error Cause Rectification4 … 20 mA signalmissing– Electrical con-nection faulty– Check connection according tochapter "Connection steps" andif necessary, correct according tochapter "Wiring plan"– Voltage supplymissing– Check cables for breaks; repair ifnecessary– Operating volt-age too low orload resistancetoo high– Check, adapt if necessaryCurrent sig-nal greater than22 mA or lessthan 3.6 mA– Electronicsmodule in thesensor defec-tive– Exchange the instrument or send itin for repairDepending on the reason for the fault and the measures taken, thesteps described in chapter "Setup" must be carried out again or mustbe checked for plausibility and completeness.Should these measures not be successful, please call in urgent casesthe VEGA service hotline under the phone no. +49 1805 858550.The hotline is also available outside normal working hours, sevendays a week around the clock.Since we offer this service worldwide, the support is provided inEnglish. The service itself is free of charge, the only costs involved arethe normal call charges.8.5 Calculation of total deviation (according toDIN 16086)The total deviation of a pressure transmitter indicates the maximummeasurement error to be expected in practice. It is also called maxi-mum practical deviation or operational error.According to DIN 16086, the total deviation Ftotal is the sum of thebasic accuracy Fperf and the long-term stability Fstab:Ftotal= Fperf + FstabThe basic accuracy Fperf is composed of the deviation FKl and thethermal change of zero signal and output span FT:Fperf = √((FT)2 + (FKl)2)This applies to a digital signal output via HART, Profibus PA or Foun-dation Fieldbus. With a 4 … 20 mA output, there is also the thermalchange of the current output Fa:Fperf = √((FT)2 + (FKl)2 + (Fa)2)To provide a better overview, the formula symbols are listed togetherbelow:• Ftotal: Total deviation• Fperf: Basic accuracy• Fstab: Long-term driftReaction after fault recti-fication24 hour service hotlineMeaning of the totaldeviation