VEGA MINITRAC 31 4 … 20 mA_HART - four-wire With SIL qualification - Manual (Page 8)

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3 Product description
MINITRAC 31 • 4 … 20 mA/HART - four-wire
43389-EN-131119
The instrument is available in different electronics versions. Each ver-
sion can be identified via the product code on the type label:
•
Standard electronics type PT30E-XX
The scope of delivery encompasses:
•
Radiation-based sensor
•
Documentation
– this operating instructions manual
– Safety Manual (SIL) PROTRAC series 30 (Document-ID 42961)
– Operating instructions manual "Display and adjustment mod-
ule" (optional)
– Ex-specific "Safety instructions" (with Ex versions)
– if necessary, further certificates
3.2 Principle of operation
The instrument is suitable for applications in liquids in vessels also
under difficult process conditions. There are application possibilities
in nearly all areas of industry.
The measured value is detected contactlessly right through the vessel
wall. Neither a process fitting nor a vessel opening are required. The
instrument is thus ideal for retro installation.
The instrument is various application possibilities. Apart from the level
detection, the MINITRAC 31 can also detect residues.
1 2
Fig. 2: MINITRAC 31 - Application possibilities
1 Level measurement - Residue detection
2 Point level detection
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 NaI detector on the opposite
side receives the radiation. The intensity of the radiation depends
Electronics versions
Scope of delivery
Application area
Functional principle