Vega SOLITRAC 31 4 … 20 mA_HART - four-wire With SIL qu Bedienungsanleitung PDF herunterladen (Seite 8)

3 Product description

SOLITRAC 31 • 4 … 20 mA/HART - four-wire

43387-EN-131119

•

Modicationstatuselectronicsfrom-07

Theinstrumentisavailableindierentelectronicsversions.Eachver-

sioncanbeidentiedviatheproductcodeonthetypelabel:

•

StandardelectronicstypePT30E-XX

The scope of delivery encompasses:

•

Radiation-based sensor

•

Mounting accessory

•

Documentation

– this operating instructions manual

– Safety Manual (SIL) PROTRAC series 30 (Document-ID 42961)

– Operating instructions manual "Display and adjustment mod-

ule" (optional)

– Ex-specic"Safety instructions" (with Ex versions)

– ifnecessary,furthercerticates

3.2 Principle of operation

The instrument is suitable for applications in liquids and bulk solids in

vesselsunderdicultprocessconditions.Thereareapplicationpos-

sibilities in nearly all areas of industry.

The level is detected contactlessly right through the vessel wall.

Neitheraprocessttingnoravesselopeningarerequired.Theinstru-

ment is thus ideal for retro installation.

In radiation-based measurement, a Caesium-137 or Cobalt-60 iso-

tope emits focussed gamma rays that are attenuated when penetrat-

ingthevesselwallandthemedium.ThePVTdetectorontheopposite

side of the tank receives the radiation, whose strength is dependent

on the level. The measuring principle has proven to be very reliable

in conjunction with extreme process conditions because it measures

contactlessly from outside through the vessel wall. The measuring

system ensures maximum safety, reliability and plant availability,

independently of the medium and its properties.

3.3 System limitations

Thereareseveralmeasuringprinciple-specicfactorswhichcaninu-

ence the measuring result. Keep these factors in mind in order to fully

utilize the capabilities of the instrument with respect to measurement

certainty and reproducibility.

The implemented radioactive isotope and its activity must be selected

according to the properties of the vessel and the medium. The neces-

sary radioactive activity must be calculated on the basis of the plant

data.

To this end, make use of our planning service for an optimum layout of

the measurement and selection of the isotope. This applies particu-

larly to SIL applications.

Electronics versions

Scope of delivery

Application area

Functional principle

Activity of the source

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