Level measurement with Uni-Probe LB 490

The Uni-Probe LB 490 is used for the non-contacting, non-intrusive measurement of point level or continuous level.
Uni-Probe LB 490 is a compact field device, combining both detector and evaluation in one single instrument. It provides interfaces for

  • HART
  • Profibus PA
  • Foundation Fieldbus

Even when using the level measurement Uni-Probe LB 490 in Profibus or Fieldbus systems you will have always the possibility to switch over to HART communication in case of need. In addition the separate 4-20mA current output can always be used as alternative signal output.

 

 

Tabs

Specifications

 

LB 490
Detector operating data 
Power supply100 ... 240 VAC, ±10%, 50 ... 60 Hz, 15 VA
24 VDC (18 ... 32 VDC), 15 W; 24 VAC +10%/-15%, 50 ... 60 Hz, 15 VA

Cable connections

4 cable entries, 3/4 inch, NPT, closed with blind plug                 Option: metric adapters and cable glands upon request

maximum cable length

3300 m (120 Ω), 1600 m (250 Ω), 800 m (500 Ω)

Wire cross-section

0.5 ... 1.5 mm2

Housing materialStainless steel ISO 1.4301 / AISI 304
Water coolingOption, max. 6 bar

Cascading

up to 8 detectors

Scintillator Size Ø x length [mm]

CrystalSENS (point detectors)

50 x 50 (NaI/Tl)

UniSENS
(rod detectors)

50 x 500 (polymer)
50 x 1000 (polymer)
50 x 1500 (polymer)
50 x 2000 (polymer)

TowerSENS

50 x 1000 basic module (polymer)
50 x 2000 basic module (polymer)
50 x 2000 extension module (polymer)
up to 3 extension modules

SuperSENS150 x 150 (polymer)

Ambient temperature
Operation and storage

-40 ... +60 °C (-40 ... +140 °F) for NaI/Tl and/or
-40 °C ... +55 °C (-40 ... +131 °F) for polymer
Observe possible temp. restrictions for Ex-protection!
for 100...240 VAC version, operation only up to max. 50 °C

Temperature stability

≤0,002%/ °C (-20 ... +50 °C) for NaI/Tl and/or
≤0,01 %/ °C (-20 ... +50 °C) for polymer

Detector certificates & tests 

IP protection

IP65 / IP66 + Nema 4X

Explosion protection

ATEX:
II 2 GD EEx d IIB T5 IP66 T80 °C                         -40 ... +80 °C
II 2 GD EEx d IIC T6 IP66 T80  °C                        -40 ... +60 °C
(...+50°C for LB 490 TowerSENS and SuperSENS)
II 2 GD EEx d [ia] IIC T6 IP66 T80 °C                   -20 ... +50 °C

FM/CSA:
Class I Division 1 Group A, B, C, D
Class II Division 1 Group E, F, G                           -40 ... + 50°C

Other certificatesNepsi, IECEx, Kosha, CCOE, others upon request
Signal inputs and outputs 
Signal outputHART 4 ... 20 mA potential-free, active or passive                             max. impedance: 500 Ω (active)                                                    Voltage supply: 12 V ... 24 V (passive)

max. impedance at 12 V: 250 Ω and/or 24 V: 500 Ω (passive)

Option: intrinsically safe HART current output 4 ... 20 mA, potential-free, passive

Voltage supply: 12 ... 30 V, voltage drop <3.5 V, 20 m signal cable (blue), pre-assembled

Exi IIB: Lo=14.78 mH; Co=679 nF / Exi IIC: Lo=2.18 mH; Co=84 nF
Bus output - Option

Bus interface: Profibus PA or Foundation Fieldbus                             Bus powered, typical 13 mA with 2xAI function blocks                Option: intrinsically safe Bus interface, 20 m signal cable (blue),  pre-assem‑bled                                                                        Approval according to ATEX and FISCO

Digital inputsDig In 1: Hold input, Dig In 2: Empty adjustment
Digital outputs1 relay (SPDT) for collective fault message
3 relays (SPDT) alternatively for: Hold signal, min. / max. alarm, detector temperature, radiation interference detection

Permissible load at ohmic load: max. 5 A at 250 VAC or 30 VDC

InterfacesRS 232 for software update

Data backup

in non-volatile memory

 

Download
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
Brochure
Format Size
Interface and Multiphase Level Measurement en PDF 1.72 MB
Level measurement brochure en PDF 1.77 MB
Product Data Sheet LB 490 en PDF 244.23 KB
Certificate
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
Continuous Level en PDF 7.12 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 769.01 KB