Level measurement with SENSseries LB 480

High-sensitive Detectors for Non-contact Process Measurements

The level detector SENSseries LB 480 is a compact field device combining cutting-edge measurement technology with the highest level of manufacturing quality and innovative features – the best system for high demand applications:

  •           high level and low level switch  
  •           continuous level measurements
  •           interface layer measurements

Safety Integrity

The level gauge SENSseries LB 480 is awarded SIL2 certification. The certificate covers point level and continuous level as well as cascaded detector systems. Furthermore the SENSseries system provides many safety features and diagnosis functions such as a “Monitored Current Output” ensuring safe and reliable measurement during the complete time of operation. SIL 3 operation is possible in redundancy installations (1oo2).

Be SENSitive

SENSseries detectors have an outstanding sensitivity resulting in a significantly increased measuring accuracy. This allows for the use of very small source activities – a great advantage in terms of shielding costs and radiation protection matters.


The product version SpeedStar is used when rapid process changes have to be detected immediately. It offers an unmatched quick measurement with update rates down to 50ms only. One example of application is to measure the filling level of gas bottles which needs to be done in >100ms due to the quick throughput of the gas bottles.



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.
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
(others upon request)
Water coolingOption (can also be retrofitted), max. 6 bar


up to 17 detectors

Scintillator Size Ø x lenght [mm]

(point detectors)

50 x 50 (NaI/Tl)

(rod detectors)

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

Temperature stability

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

≤0.01 %/°C (-40 ... +55°C) for polymer

Detector certificates & tests 

IP protection

IP65 / IP66 / IP67 / IP68 / IP69K

Explosion protection

II 2 G Ex db eb IIC T5 / Ex tb IIIC T95 °C -40°C ...80°C
II 2 G Ex db eb IIC T6 / Ex tb IIC T80 °C -40°C ...65°C

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: 12 V ... 24 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

Data backup

in non-volatile memory


Application Report
Format Size
Continuous Level measurement for cement clinker coolers en PDF 754.12 KB
Format Size
Interface and Multiphase Level Measurement en PDF 1.72 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
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 User Interface 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

News about this product

The radiometric gauge SENSseries LB 480 is awarded SIL2/SIL3 certification.

Read more