Level switch measurement with Uni-Probe LB 490

The universal field device for various applications

Uni-Probe LB 490 is used for non-contact measurement of level switch and level values. The compact field probe combines detector and evaluation in one device. The level switch measurement is inexpensive, reliable, and accurate and comes with very low source activity.
The level switches Uni-Probe LB 490 has interfaces for HART, Profibus PA and Foundation Fieldbus.
Even if the LB 490 is used in Profibus or Fieldbus systems, it is always possible to switch to HART communication if required. The separate 4-20mA current output can alternatively be used as a signal output (e.g. for a remote display). Relay contacts (DPDT) are available as a binary signal for the level switch.

The robust compact unit for high demands - your advantages at a glance

  • Inexpensive and solid system for standard applications
  • Compact field device with integrated evaluation unit
  • Communication via HART, Foundation Fieldbus or Profibus PA
    (switchable from bus to HART)
  • Communication can be switched over from Bus to HART at any time
  • High operational safety, FMEDA with SFF 96%
  • Many digital and analogue outputs and inputs make the Uni-Probe universally usable

SuperSENS for extreme wall thicknesses

SuperSENS bei großen BehälternLarge containers with extreme wall thicknesses require very high activities. When using the SuperSENS, the source activities can be significantly reduced.
If you already have measurements with point detectors and you are faced with the decision to replace the now weak sources, replacement with a SuperSENS can avoid a replacement of the source, as this will significantly increase the lifetime of the sources.


Application Report
Format Size
Continuous Level measurement for cement clinker coolers en PDF 754.12 KB
Level Measurement of coke drum level en PDF 694.69 KB
Format Size
Interface and Multiphase Level Measurement en PDF 1.72 MB
Level Measurement Russian language en PDF 2.3 MB
Level Measurement Brochure en PDF 4.85 MB
Product Data Sheet LB 490 en PDF 244.23 KB
Format Size
ATEX LB 490-TS, LB 491 SuperSENS en PDF 1.89 MB
CCOE LB 490-TS, LB 491 SuperSENS en PDF 243.11 KB
CCOE Zertifikat LB 49x en PDF 243.11 KB
CSA Zertifikat LB 49x en PDF 383.09 KB
FM LB 490-TS, LB 491 SuperSENS en PDF 244.5 KB
Uni-Probe ATEX Certificat LB49x en PDF 1.63 MB
Uni-Probe FM Certificat LB49x en PDF 63.96 KB
Operation Manual
Format Size
LB 490 Uni-Probe en PDF 31.77 MB
Product Information
Format Size
Level & Density Measurement for -50°C (-58°F) de, en PDF 2.26 MB
Uni-Probe User Interfaces en PPT 511 KB
Project Questionnaire
Format Size
Level en PDF 105.49 KB
Level Switch en PDF 109.14 KB
Software Tool
Format Size
LB 490 & LB 491 DTM for HART de, en ZIP 18.78 MB
LB 490 device description for Foundation Fieldbus with capability file de, en ZIP 79.65 KB
LB 490 device description for HART for Siemens Simatic PDM Version 6.0 de, en RAR 41.2 KB
LB 490 device description for HART-communicator de, en ZIP 76.06 KB
LB 490 device description for Profibus PA with GSD file de, en ZIP 95.33 KB
Technical Information
Format Size
LB 490 Uni-Probe de, en PDF 2.86 MB
LB 490 Tower-Sens de, en PDF 9.4 MB