Bronkhorst MASS-VIEW Series Manual do Utilizador descarregar pdf (Página 18)

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BRONKHORSTHIGH‐TECH

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Page18 MASS‐VIEW®series 9.17.051

Mode(FlowDDEparameter156)

Withthe“mode”parametertheusercanchooseifthealarmsresetautomaticallyormanually.

Whentheresetmodeissettoautomatic,thealarmswillberesetwhenmeasurereachesthedesired

levelandthedelaytimehasexceeded.

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Whentheresetmodeismanual,

theusercanresetthealarmsinthefollowingways:

1. Withthe“reset”optioninthealarmsmenu.

2. ViaRS‐232(orFLOWDDE/FlowView/FlowPlot).

Writingthevalue“2”toFLOWDDEparameter114resetsthealarms.

3. Whenthereadoutscreenisvisibleandanalarmis

active,thiswillbedisplayedatthetopof the

screen (see chapter 3.4.7). By pressing up at an alarm situation, the user can reset the alarms

fromthereadoutscreen.

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Relay

The relays parameter sets the output mode of the relays. The user can choose between disabled,

enabledand

pulse.Whenarelayisactive,therelaycontactwillconnecttothe0Vsignal.

3.4.7 Alarm outputs

Thestatusofthealarmscanbereadinvariousways.

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Forexamplewhentheminimumandmaximumalarmsareenabledthisis

madevisibleinthereadoutscreenwithtwomarkersattheleftofthe

graph(seepictureontheright).

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Whenanalarmarisesthecorrespondingmarker

willbehighlightedand

theheaderwillblinkanddisplaythealarm.

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TheMASS‐VIEW

metershavetworelayswhichindicateanalarmsituation.

Thestatusoftherelaysdependonthealarmsourceandstatusofthe

relayparameter(seetablebelow).

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 disable enable pulse

Relay1 Relay2 Relay1 Relay2 Relay1 Relay2

Minalarm 0 0 1 0 0/1/0/1/0/1… 0

Maxalarm 0 0 0 1 0 0/1/0/1/0/1…

Response(min) 0 0 1 1 0/1/0/1/0/1… 0/1/0/1/0/1…

Response(max) 0 0 1 1 0/1/0/1/0/1… 0/1/0/1/0/1…

Counter 0 0 1 1 0/1/0/1/0/1… 0/1/0/1/0/1…

3.4.8 User tag

TheUsertagcanbeeditedatthemenuiteminfo.

3.5 Other gases

TheMASS‐VIEW

seriesarecalibratedonAir.Allotherpre‐installedgasesarecalculatedusinga

theoreticalconversionmodelwhichdescribestheflowcurveforothergaseswhichwillintroduce

additionalinaccuracies.

However,astheaccuracyoftheconversionmodelalsodependsonviscosity,pressureandtemperature,

specialattentionshouldbetaken

forgasesintheheterogeneousgasstatewherespecificheat,density,

thermalconductivityandviscositycanvarytremendously.

3.6 Zeroing procedure

TheMASS‐VIEW

hasazeroprocedureforeachindividualgas.Thezerofunctionpermitstheuserto

zerotheinstrumentwhenneeded.Pleasemakesuretheinstrumentiszeroedonthedesiredgasatthe

desiredoperatingtemperatureandpressureconditions.Itisextremelyimportantthatallflowbe

blockedandthe

MASS‐VIEW

isinastatic(NOFLOW)condition.SelectfromthemainMenuOption‐>

Fluidset‐>Zero.Pauseafewseconds,thenpressanykeytocompletethezeroprocedure.

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