Vega Vegamet 381 EX Operating Instructions Manual
Also see for VEGAMET 381 Ex: Safety manualOperating instructions
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266 Setup with the integrated display and adjustment unitVEGAMET 381 Ex • 4 … 20 mA signal conditioning instrument30418-01-151103• [+/-] key:– Change value of the parametersBy pushing the [+/-] key, you change the indivi-dual parameters of the selected function. In thisphase, the processed parameter is flashing. Bybriefly pushing the two keys simultaneously, yousave your settings. "Save" is briefly displayed.6.2 Setup stepsSetupSetup comprises mainly the adjustment of themeasurement loop. A scaling of the measuredvalue for the LC display and the adaptation ofthe relay switching points are further settings.Additional setup steps would be, if necessary,setting an integration time (damping) to steadythe measured value or modifying the currentoutput characteristics.To clearly denote the measuring unit, thesupplied labels can be inserted in the cover. Incase several VEGAMET 381 Ex are used, eachmeasurement loop should be clearly labelled.Switch-on phaseAfter being switched on, VEGAMET 381 Exfirst of all carries out a short self-check. Thefollowing steps are carried out:• Internal check of the electronics• Indication of the firmware version• The output signal jumps briefly to the setfault valueThen the actual measured value is displayedand the corresponding current is transmitted tothe current output.Measured value indicationThe measured value indication shows the digitalindication value and also an analogue bargraph.Here, it is absolutely necessary that the functionswitch is set to position [ 0] ("OPERATE").Function switchThe following functions can be selected via therotary switch:• 0: Measured value display and simulation• 1: Relay 1 switching point ON• 2: Relay 1 switching point OFF• 3: Relay 2 switching point ON• 2: Relay 2 switching point OFF• 5: Decimal point position of the scaling• 6: Scaling for 100 %• 7: Scaling for 0 %• 8: Switch over current output 0/4 … 20 mA• 9: Damping of the measured value (integra-tion time)• A: Offset correction• B: Min. adjustment in percent throughchange of the level• C: Max. adjustment in percent throughchange of the level• D: Min. adjustment in mA without changingthe level• E: Max. adjustment in mA without changingthe level• F: No functionOffset correctionWhen a pressure transmitter is used, an offsetcorrection should be carried out first. Theseinstruments are factory-set in a certain position.If the pressure transmitter is now mounted in adifferent position, its measuring range is shiftedslightly. The zero point is readjusted by carryingout the offset correction in uncovered (unpres-surised) condition. The complete measuringrange will be shifted by the deviating amount.1. Make sure that the pressure transmitteris completely unpressurised, uncovered(unimmersed) and mounted in its final posi-tion.2. Set the function switch to position [A ]. Thedisplay indicates now the actual sensorcurrent in mA. Save the current status bypushing the [+/- ] keys simultaneously.Adjustment in mA without changing thelevelFor this adjustment procedure, two sensorcurrent values (4 … 20 mA) must be enteredcorresponding to the levels 0 % and 100 %.When using a pressure transmitter, an offsetcorrection should be carried out to reach maxi-mum accuracy. Carry out this offset correctionbefore adjustment and with the sensor unco-vered (unimmersed).→ Now select the position [D] or [E] on thefunction switch, enter the current values inmA for min. or max. adjustment and saveyour settings.Adjustment in % by changing the levelDuring this adjustment procedure, the cur-rent level is assigned to a certain percentagevalue. For this reason, percentage values that |
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