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OPUS 20 TCO - discontinued

Inroom Data Logger for measurement of temperature, relative humidity and CO2 (Indoor Air Quality), made in Germany!


The only LAN datalogger with built-in sensors and the highest precision! Firmware online updatable. The Opus20 runs on batteries or powered via USB. Alternatively, you have the possibility to power the device via POE (Power over Ethernet).

IMPORTANT: OPUS 20 TCO is discontinued

  • Temperature, Relative humidity, CO2
  • Temperature / NTC, Humidity / Capacitive, CO2 / NDIR
  • LAN datalogger with built-in sensors and the highest precision! Firmware online updatable
  • USB (Cable and Monitoring Software SmartGraph3 included)
  • 8120.20, 8120.20N, 8120.21, 8120.21N

Advantages of the indoor/inroom datalogger OPUS 20 TCO

  • LAN capabilities to realize universal measurement networks in real time
  • Innovative housing design with different wall mounting options
  • Monitoring and evaluation software SmartGraph3 included
  • Power over Ethernet (PoE) available as option
  • Power supply via batteries as well as USB-Connection possible
  • Firmware online updatable
  • If 21 CFR 11 guidelines have to be fulfilled, the well-established and proven MCPS8 software is available

Examples of the indoor/inroom datalogger OPUS 20 TCO

The LAN datalogger OPUS 20 TCO with built-in sensors and the highest precision is often used in the following applications:

  • Inroom Air Quality detection in schools, universities and conference rooms
  • Climate monitoring in buildings 
  • control of all climate-sensitive production processes
  • in electronic data-processing centres
  • control cabinets
  • wind turbines
  • storage rooms 
  • museums
  • many other climate-sensitive applications…

Product variants - Opus 20 TCO

The Opus 20 TCO is available in 4 product variants:

  • OPUS 20 TCO (Article no. 8120.20)
  • OPUS 20 TCO, Neutral = without Lufft branding (Article no. 8120.20N)
  • OPUS 20 TCO, PoE = Power over Ethernet   energy supply (Article no. 8120.21)
  • OPUS 20 TCO, PoE, Neutral = Power over Ethernet energy supply, without Lufft branding (Article no. 8120.21N)

CO2 and Indoor Air Quality

The amount of carbon dioxide had been virtually constant at 280 ppm (particles per million) – i.e 280 gas molecules per million air molecules – the last ten thousand years. However in recent years, this measured value has been increasing rapidly at approx. 2 % per year.
A high level of CO2 in the air within a room causes headaches, tiredness and lack of concentration. The regulation on CO2 concentration was established in order to evaluate IAQ (Indoor Air Quality). Normal atmospheric air in so-called ‘clean air areas’ has a level of 360 ppm and approx. 500 ppm in urban areas. The limit of 1,000 ppm (“Pettenkofer Figure”) is still seen as being adequate indoor-air quality, which is especially important when regarding all meetings and conference rooms, as well as schools and open-plan offices. As a guideline for school rooms in the USA the limit of 1,000 ppm applies; for workplaces the occupational exposure limit is 5,000 ppm.

Brochure - Lufft - Image brochure (EN)
Image Brochure with description of all Lufft market segments
EU declaration of conformity - Lufft OPUS20
EU declaration of conformity - Lufft OPUS20
Firmware - Lufft - Firmware OPUS20
Version 37
Manual - Lufft - OPUS20 - THI - THIP - TCO (EN)
Software - Lufft - SmartGraph3
Version 3.4.5
Video - OPUS20 - Produktfilm/Product film Lufft OPUS20 datalogger
Video - OPUS20 datalogger and SmartGraph 3
Download as PDF
Dimensions 166 x 78 x 32 mm
Measuring interval 10/30 s, 1/10/12/15/30 min, 1/3/6/12/24 h
Construction Plastic housing
Operating time with battery > 4 month
Data storage 16 MB, 3,200,000 measured values
LC-Display Height 90 x 64 mm
Weight Approx. 250 g
Included in delivery PC - Windows Software SmartGraph 3
for graphical and numerical representation
of measured values / instruction manual / data cable / battery / DIN rail bracket
Interface USB, LAN
Storage interval 1/10/12/15/30 min, 1/3/6/12/24h
Power supply 4 x LR6 AA Mignon, USB
Operating temperature -20...50 °C
Operating rel. humidity 0...100 % RH, < 20 g/m³ (non - condensing)
Max. height 10,000 m above sea level
Principle NTC
Measuring range -20 ... 50 °C
Unit °C
Accuracy ±0.3 °C (0...40 °C), otherwise ± 0.5 °C
Resolution 0.1
Relative humidity
Principle Capacitive
Measuring range 0 ... 100 % RH
Unit % RH
Accuracy ±2 % RH
Resolution 0.1
Principle NDIR
Measuring range 0 ... 5000 ppm
Unit ppm
Accuracy ± 50 ppm +3 measured values
(at 20 ° C and 1,013 mbar)
Resolution 1 ppm
Download as PDF

OPUS20: How can the data be recorded in the internal memory of the OPUS20?

The OPUS20 must be configured in Mode M3 REC or M4 REC Hide. This can be done using the configuration button on the back of the OPUS20.

OPUS20: What are the eletrical specifications for the PoE version of the OPUS20 device?

The OPUS20 PoE version uses a voltage level of 48V and the lowest current level

OPUS20: Is ethernet communication available for all OPUS20 versions?

Yes, the etherent interface is a part of all OPUS20 instruments, so all of them cam be connected to the network (LAN)

OPUS20 and SmartGraph3: Is SmartGraph3 (min. V3.2.0) compatible to Windows7/10?

Yes, SmartGraph3 was tested under Windows 7 & Windows 10 and no problems were found.

OPUS20 and SmartGraph3: How to work with SmartGraph3 Monitoring Software?

In the tutorial video we answer many questions from first steps with OPUS20 and SmartGraph3 to different configuration options:

Startup OPUS20
- Installation SmartGraph 3 (03:18 min)

SmartGraph 3
- Software settings (05:05 min)
- Manage devices (07:21 min)
- Diagram view settings (10:22 min)
- data export (14:25 min)
- print function (15:15 min)
- Software- and firmware-update (16:58 min)

To the Tutorial Video:

Lufft OPUS20 Datalogger and SmartGraph3 Monitoring Software