Level measurement with SENSseries LB 480

Highly sensitive detectors for non-contact level measurement

SENSseries LB 480 is particularly suitable for demanding measuring tasks in safety-related applications. The level measuring system is certified for use in SIL2 plants. Berthold Technologies is the first manufacturer of SIL certified radiometric level , level switch (min/max. Alarm) and density measurement systems. Even SIL3 can be achieved with the redundant installation of two LB 480 measurement systems.

Functional safety of our level measurement

The high reliability of the measurement is supported by important diagnostic functions, such as permanent monitoring of the detector function by crosschecking the cosmic background radiation and much more. This guarantees outstanding operational safety.
The cosmic radiation control also makes it possible to keep the required source activity very low. Only Berthold Technologies is able to use the LB 480 as a density or min/max level switch in SIL2 / 3 safety circuits, in addition to its use as a level field device.

Perfect for the highest demands - your advantages at a glance

• Compact field probe with integrated evaluation unit
• Process connection via HART
SIL 2 or SIL 3 with homogeneous redundancy
• Quick Start menu for easy and quick start up
• Continuous self-monitoring
• High immunity to interference (SIL standard)
• Gas density compensation
• External radiation detection - XIP (X-ray interference protection)

X-ray Interference Protection XIP

With this function, weld tests can no longer distort the measured value. The measured value is frozen until the external radiation influence is over. A digital output signals the detection of interfering radiation. All our level measurements are equipped with XIP. Additional Information

Does your product contain natural radioactive radiation?

No problem! The Product Radiation Compensation (PRC) feature provides reliable, accurate level measurement through independent activity measurement and integral compensation for a reliable and precise level measurement. More info

Does the gas pressure in your vessel change?

In the case of radiometric measurement, this can falsify the measured value, unless you have gas density compensation from Berthold Technologies. With the feature GPC (Gas Property Compensation), a second measurement determines the current gas density in the tank and has a compensating effect on the connected level measurement. Thus, a level measurement is realized, which provides an unaltered measured



CrystalSENS Detector

Point detector with high-sensitive, high-quality Sodium Iodide crystal for best long-term stability.

UniSENS Detector

Rod detector with a sensitive detector length of 0.5 up to 2.0m for level and interface measurements.

SuperSENS Detector

Best sensitivity on the market, is able to work with smallest source activities.

TowerSENS Detector

With a max. length of 8 m - the rod detector is specifically designed to monitor long measuring ranges
LB 480
Detector operating data 
Power supply100 ... 240 VAC, ±10%, 50 ... 60 Hz, 8 VA
24 VDC (18 ... 32 VDC), 8 W

Cable connections

4 cable entries M20 closed with blind plug

Option: Cable glands M20

Maximum cable length

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

Wire cross-section

0.5 ... 1.5 mm2 (up to 2.5 mm2 without wire-end sleeve)

Housing materialStainless steel ISO 1.4301 / AISI 304, optional 316L (others upon request)
Water coolingOption (can also be retrofitted), max. 6 bar


up to 17 detectors

 Scintillator Size      Weight  Weight with
Ø x lenght [mm]     [kg]       cooling systems[kg] Collimator

(point detectors)

50 x 50 (NaI/Tl)        12.5         16.5                             Option

(rod detectors)

50 x 500 (polymer)   16            25                                Option
50 x 1000 (polymer) 21            32                                Option
50 x 1500 (polymer) 25            40                                Option
50 x 2000 (polymer) 30            48                                Option

base module
base module

50 x 1000 (polymer) 20            27                                 -
50 x 2000 (polymer) 26            41                                 -
50 x 2000 (polymer) 17            32                                 -
Up to 3 extension modules

SuperSENS150 x 150 (polymer) 52            59                              Standard

Ambient temperature
Operation and storage

-40 ... +60 °C (-40 ... +140 °F) for 
Observe possible temperature restrictions for Ex-protection!

Temperature stability

≤0.002 %/°C (-40 ... +60°C) for CrystalSENS and/or

≤0.01 %/°C (-40 ... +60°C) for UniSENS

Detector certificates & tests 

IP protection

IP65 / IP66 / IP67 / IP68 / IP69K

Explosion protection


II 2 GD Ex db IIC T5/Ex tb IIIC T95°C  -40°C...80°C
II 2 GD Ex db IIC T6/Ex tb IIIC T80°C  -40°C...65°C
II 2 GD Ex de (ia Da) IIC T6 Gb           -40°C...50°C
II 2 GD Ex de (ia Da) IIIC T80°C Db     -40°C...50°C
Class I, Division 1, Group B, C, D
Class I, Division 1 Group A, B, C, D
Class II, Division 1, Group E, F , G
Class I Zone 1 AEx de IIC
Class I Zone 1 AEx de (ia) IIC

-40°C... 80°C (T1-T5), -40°C...65°C (T6)

Vibration / ShockVibration: 1.9 g / mechanical Shock: 30 g
According to DIN EN 60068-6 and 60068-2-27
Signal inputs and outputs 
Signal output

HART 4 ... 20 mA potential-free, active or passive

max. impedance: 500 Ω (active)

Resolution better than 0.006 mA

Stability +/-0.001 %/°C (-40 ... 60 °C)

Voltage supply: 18 V ... 32 V (passive)

max. impedance at 12 V: 250 Ω (passive)

max. impedance at 24 V: 500 Ω (passive)

Digital outputs

Open Collector alternatively for: Max. alarm, min. alarm,warning mes­sages + error messages,
Hold signal, interference radiation detection, detector temperature
Permissible load at ohmic load: max. 100 mA at 5 ... 36 VDC

InterfacesRS 485 for software update, cascading, gas-density compensation
Detector service modemFor operation via PC

Data backup

in non-volatile memory


Fast measurement sample rate in milliseconds
Compensation of gas-phase fluctuations
Radiation interference detection - XIP (X-ray interference protection)
Automatic warning source exchange
Event log, chanhe log
QuickStart menu
Continuously monitored current output


Application Report
Format Size
Continuous Level measurement for cement clinker coolers en PDF 754.12 KB
Format Size
Level Measurement Russian language en PDF 2.3 MB
Level Measurement Brochure en PDF 4.85 MB
Product Data Sheet LB 480 en PDF 137.76 KB
SIL Approved Radiometric Detectors SENSseries LB 480 en PDF 339.29 KB
Whitepaper Radiometric Measurements Accurarcy, repeatability and errors en PDF 739.65 KB
Format Size
ATEX LB 480 en PDF 6.51 MB
IECEx LB 480 en ZIP 3.03 MB
LB 480 CSA Ex for Zones USA & Canada Certificate de, en PDF 322.25 KB
LB 480 FM Ex for Class/Division in Canada de, en PDF 229.69 KB
LB 480 FM Ex for Class/Division in USA de, en PDF 229.78 KB
LB 480 Summery Ex-Certificates en PDF 66.71 KB
SIL SENSseries LB 480 en PDF 473.42 KB
Operation Manual
Format Size
LB 480 Level en PDF 10.8 MB
Press & Media
Format Size
No half measures Published by Hydrocarbon Engineering, June 2017 by G. Webb. This article discusses the advantages of radiometric level measurements, also known as nuclear, measurement techniques. en PDF 1.74 MB
Product Information
Format Size
DTM for SENSseries LB 480 & SmartSeries LB 414 en PDF 2.43 MB
Gas Property Compensation for Level Measurements en PDF 1.99 MB
LB 480 CSA Cerficate en PDF 1.76 MB
LB 480 SIL en PDF 3.44 MB
Level Measurement of Products with Natural Radioactivity en PDF 1.53 MB
PRC Instead of Source Exchange en PDF 1.39 MB
Project Questionnaire
Format Size
Level en PDF 105.49 KB
Software Tool
Format Size
FlashLoader for Software Update de, en ZIP 2.97 MB
LB 480 & LB 414 HART DTM V2.4.4.61 Software Level, Density, Switch de, en ZIP 18.19 MB
LB 480 DeviceDescription for 475 HART-Communicator Level, Density, Switch de, en ZIP 470.58 KB
LB 480 Embedded Software V01.00.06 Level, Density, Switch de, en ZIP 3.87 MB
LB 480 HART DD Software HCF Level, Density, Switch de, en ZIP 1.18 MB
LB 480 PC Control Software Version: 2.0.1 de, en ZIP 4.07 MB
Technical Information
Format Size
LB 480 Level de, en PDF 2.97 MB
LB 480 TowerSens de, en PDF 5.96 MB