testo 191-T3 - HACCP temperature data logger with long, flexible probe

Order-Nr.  0572 1913

  • Precise temperature measurement in liquids and on surfaces using a long, flexible probe

  • Durable, robust, reliably tight, even after changing the battery

  • Changing the battery takes just seconds, saving time and increasing efficiency

  • Simultaneous programming and readout of several HACCP data loggers via the multifunction case

Certified by HACCP International, the testo 191-T3 temperature data logger is ideal for monitoring the temperature in liquids or on surfaces, such as on plates of freeze-drying systems. Use the data logger designed for food production for monitoring pasteurization, sterilization and freeze-drying processes.


Product Description

Pasteurization, sterilization and freeze-drying are key processes in food production when it comes to increasing the shelf life of foods. These processes place extremely high demands on the measuring technology used.

Our reliable and robust temperature HACCP data logger supports you in monitoring these processes efficiently.

This is what the testo 191-T3 HACCP temperature data logger offers

  • High-precision: precise HACCP data logger with long, flexible probe (length 775 mm, Ø 1.5 mm), reading memory of 60,000 readings
  • Long, flexible probe: ideal for sterilization applications in liquids or on surfaces of freeze-drying systems. In combination with the freeze dryer probe holder (please order separately), the surface temperature of freeze-drying systems can be accurately measured
  • Slim design: with a diameter of 20 mm, the loggers are ideal for use in tight objects or cramped conditions
  • Robust and durable: high-quality materials and innovative construction make the HACCP data logger particularly robust and durable. Thanks to hermetically sealed measuring technology in a separate stainless steel housing, the HACCP data logger impresses due to its reliability and maximum robustness
  • Battery change in seconds: the practical thread enables the battery to be screwed onto the HACCP data logger and changed intuitively and securely without using any tools
  • Reliably tight: the HACCP data logger remains 100% tight even after the batteries are changed. The battery housing is coated in highly temperature-proof polyether ether ketone (PEEK)
  • Flexible height: the size of the HACCP data logger can vary with two different types of battery. The small battery makes the logger's dimensions particularly compact. The larger battery (included in the scope of delivery) is suitable for measurements at low temperatures, for example in freezer systems


Programming, readout and analysis of the data logger

Very practical to use: in addition to being used for storage, the multifunction case (available in two different sizes) can also be used for parallel programming and readout of up to 8 data loggers simultaneously. This means you do not need any additional readout unit and you also save time.

With the specially developed testo 191 professional software (please order separately) you can program and read out the data logger, as well as analyzing the measurement data, on the PC. The clear software structure guides you intuitively through the process step by step. During input, it provides help at critical points through warnings. The software thus enables even inexperienced users to carry out the measurement process easily.

Delivery Scope

1 x testo 191-T3 HACCP data logger, including battery large, distance adapter long for testo 191 programming and readout unit, calibration protocol and instruction manual.

Technical Data

Temperature - Pt1000

Measuring range

-50 to +140 °C


±0.2 °C (-50 to -40 °C)

±0.1 °C (-40 to 140 °C)


0.01 °C

Reaction time

t₉₀ = 6 s

General technical data


20 x 63 mm (ø x height)

Operating temperature

-50 to +140 °C

Product-/housing material

Stainless steel, PEEK plastic

Protection class


Diameter probe shaft

15 mm

Diameter probe shaft tip

3 mm

Length probe shaft

775 mm

Length probe shaft tip

25 mm

Measuring rate

1 s to 24 h





Battery life

2,500 operating hours (measuring cycle 10 sec at +121 °C)

Battery type

1/2 AA lithium


60,000 measuring values

Storage temperature

-20 to +50 °C