Vega Vegamet 381 Operating Instructions Manual
Also see for Vegamet 381: Operating instructions
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l F: Changeover current input active/passiveCurrent input active/passivel In active mode, VEGAMET 381 provides thepower for the connected sensor. Power supplyand measurement data are transmitted overthe same two-wire cable. This mode isprovided for connection of measuring trans-ducers without separate power supply (sensorin two-wire version).l In passive mode, the sensors are not powered,only the measurement value is transmitted.This mode is provided for connection oftransmitters with their own separate powersupply (sensors in four-wire version).à Set the function switch to position [F] andselect the suitable mode with the [+/-] keys.Save your settings by pushing both keyssimultaneously.Offset correctionWhen a pressure transmitter is used, an offsetcorrection should be carried out first. Theseinstruments are factory-set in a certain position. Ifthe pressure transmitter is now mounted in adifferent position, its measuring range is shiftedslightly. The zero point is readjusted by carrying outthe offset correction in uncovered (unpressurised)condition. The complete measuring range will beshifted by the deviating amount.à Make sure that the pressure transmitter iscompletely unpressurised, uncovered (unim-mersed) and mounted in its final position.à Set the function switch to position [A ]. Thedisplay indicates now the actual sensor currentin mA. Save the current status by pushing the[+/- ] keys simultaneously.Adjustment in mA without changing the levelFor this adjustment procedure, two sensor currentvalues (4 … 20 mA) must be entered correspond-ing to the levels 0 % and 100 %.When using a pressure transmitter, an offsetcorrection should be carried out to reach maximumaccuracy. Carry out this offset correction beforeadjustment and with the sensor uncovered (unim-mersed).à Select now position [D] or [E] on the functionswitch, enter the current values in mA for min.or max. adjustment and save your settings.Adjustment in % by changing the levelDuring this adjustment procedure, the current levelis assigned to a certain percentage value. For thisreason, percentage values that correspond to theactual filling levels must be entered for the min. andmax. adjustment. The ideal calibration is at 0 %and 100 %. Because it is not always possible toempty or fill a vessel completely, any value can ofcourse be entered. The greater the differencebetween the two adjustment points, the moreprecise the measurement. It does not matter whichvalue is entered first.à Select position [B] or [C] on the function switch,enter the percentage values for the min. andmax. adjustment and save your settingsRelay outputsTwo operating relays are integrated inVEGAMET381 for level detection. First of all, determine atwhich switching points the relays should switch onand off again. Furthermore you have to distinguishbetween the relay modes overfill and dry runprotection. You switch over by exchanging the ON/OFF values of the relay.l Overfill protection: Relay is switched offwhen the max. level is exceeded (safecurrentless condition), relay is switched onagain when the level falls below the min. level(switch on point < switch off point)l Dry run protection: Relay is switched offwhen the level falls below the min. level (safecurrentless condition), relay is switched onagain when the max. level is exceeded (switchon point > switch off point)à To adjust the on and off switching points ofrelay 1, set the function switch to position [1] or[2], enter the switching points for ON or OFFand save your settings. If necessary, proceedin the same way with relay 2 (position [3] or[4]).24 VEGAMET 381Setup with the integrated indicating and adjustment unit27567-01-070216 |
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