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OPUS 20 THI - discontinued

For climate monitoring in buildings and the control of all climate-sensitive production processes


The data logger is equipped with built-in sensors of high precision. It runs on battery power, via USB port or PoE (Power over Ethernet).

IMPORTANT: OPUS 20 THI is discontinued

  • Temperature & Relative humidity
  • Temperature / NTC, Humidity / Capacitive
  • LAN datalogger with built-in sensors and highest precision, evaluation software SmartGraph3 included
  • USB (Cable and SmartGraph3 monitoring software included)

Advantages of the indoor/inroom datalogger OPUS 20 THI

  • 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 THI

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

  • 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 THI

The Opus 20 THI is available in 4 product variants:

  • OPUS20 THI  (Article no. 8120.00)
  • OPUS20 THI, Neutral = without Lufft branding (Article no. 8120.00N)
  • OPUS 20 THI, PoE = Power over Ethernet energy supply (Article no. 8120.01)
  • OPUS 20 THI, PoE, Neutral = Power over Ethernet energy supply, without Lufft branding (Article no. 8120.01N)
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 > 1 Year
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, 1/3/6/12/24 h
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
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