Product EXaminer® CUI

EXaminer® CUI

Corrosion under insulation (CUI) sensor for pipelines, Zone 1


• Relative humidity (RH), temperature (T) and direct water presence (DWP) measurements
• Low power 4G/5G cellular connectivity utilizing LTE-M or NB-IoT
• NFC or QR for quick commissioning and identification
• Rapid fixation device
• 15 years of battery life

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Ex II 1G Ex ia IIC T4 Ga

Ex ia IIC T4 Ga

Ambient Temperature

-40°C to +80°C


  • ATEX Certificate
  • IECEx Certificate


Corrosion under insulation (CUI) is one of the costliest and unavoidable problems facing the hydrocarbon processing industry today. CUI affects the steel piping, storage tanks, container vessels and other process equipment within the plants that are subject to extreme temperature fluctuations.

Insulation applied to the pipe can mitigate the thermal cycling effects. But the presence of seams, gaps or other discontinuities in the protective cladding or in the insulation layer makes them susceptible to infiltration by outside humidity or from the process environment itself.

The CUI industrial IoT sensor is tailored to continuously monitor wetting on insulated assets such as piping systems or vessels, as a part of a cost-efficient Corrosion Under Insulation (CUI) risk prediction system. Measurements are automatically transmitted to the CirruSense CUI cloud platform for further storage, analysis and presentation. The solution enables optimized maintenance based on actual corrosion risk.

With use of the CUI sensor you can pay attention to most critial parts of the pipeline, as well as reduce HSE risk for the physical worker in the hazardous area. Inspection in dry areas can be avoided or postponed. This will give you the oppurtunity to go from a reactive maintainance plan to a preventive and predictive method, which will also be cost saving over time.

Refer to the documentation for more detailed information

Technical Data

Measured properties

Relative humidity (RH)

Temperature (T)

Direct water presence (DWP)

RH measurement range

0 to 100% RH

RH measurement accuracy1

± 2% RH

T measurement range

-40 to 120 °C

T measurement accuracy1

± 0.2°C

Battery lifetime2

15 years

Cloud connectivity

Cellular 4G/5G (LTE-M or NB-IoT)


IEC 61406 Identification Link on printed label, QR code and NFC

Default sample interval

1 hour

Default transmission interval

24 hours

Explosion protection

Ex II 1G Ex ia IIC T4 Ga, Tamb -40°C to +80°C

Ingress protection


Radio certification

Band 3 and 20

Housing material

UV stabilized POM

Radio compliance

Radio Equipment Directive, 2014/53/EU

Band 3/20

SE-RED-2002458 Ed.1D

Manuals/Operating Instructions/Guides

  • Installation Guide - EXaminer® CUI 310 E NB

  • Quick Start Guide


Data Sheets