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Liquid Baths with Maximum Temperature Uniformity

Our calibration baths from Kambic are ideal for calibrating temperature probes, temperature transmitters or even complete temperature systems. They allow simultaneous calibration of multiple systems with the added benefit of being able to accommodate probes of all shapes and sizes. Exceptional temperature stability and precise temperature distribution across the entire bath volume ensure that sensors and reference probes always measure a uniform temperature.

The range of Kambic liquid temperature calibration baths we offer are calibrators with a highly stable temperature control system and a unique temperature uniformity of better than ±0.007 °C across the entire used part of the tank.  Such precision is achieved using a 2-cylinder system with a uniform vertical flow throughout the utilized portion of the tank while using a finely balanced, high-performance microprocessor control loop. 
Depending on the temperature range, Kambic calibration baths are equipped with different cooling systems: These range from simple tap water cooling to integrated refrigeration compressors and even multi-stage cascade compressors for models with extremely low temperatures.

The calibration baths are available as laboratory versions, baths with deep tanks and micro calibration baths.

  • “True” -90 °C to +250 °C
  • Uniformity and stability in the mK range
  • Fast heating and cooling rates
  • Up to 500 mm immersion depth
Customized solutions
We realise customized calibration baths to offer the ideal solution for your calibration application. Describe your requirements and we implement your individual calibration solution.
Micro Calibration Bath OBM with “Vertical Flow Design
The unique “Vertical Flow Design (VFD)” guarantees maximum stability and uniformity.


Kambic Liquid Calibration Baths

Calibration bath for high temperatures above +40 °C

High-Temperature calibration bath “OB”
Temperature range +40 °C to +250 °C
Temperature stability (°C) 

±0.001 °C at 50 °C
±0.002 °C at 100 °C
±0.006 °C at 250 °C
Temperature uniformity (°C)  ±0.007 °C at 100 °C
Tank volume 7, 22 and 50 liters 
Learn more about the OB calibration baths

Calibration bath for low temperatures down to -40 °C

Low-Temperature calibration bath “OB-LT”
Temperature range -40 °C to +180 °C
Temperature stability ±0.004 °C at 40 °C
±0.005 °C at 20 °C
±0.002 °C at 100 °C
Temperature uniformity ±0.007 °C at 40 °C
Tank volume 7, 22 and 50 liters 
Learn more about the OB-LT calibration baths

OB-LT calibration baths

Kambic calibration bath -90 °C

Calibration bath for ultra-low temperatures down to -90 °C  

With our low-temperature calibration baths, you can get “real” temperatures of -90 °C to +250 °C for your calibration needs.

Ultra-Low Temperature Calibration Bath “OB-ULT"
Temperature range -90 °C to +130 °C
Temperature stability ±0.005 C at -90 °C
±0.005 °C at +20 °C
±0.002 °C at +50 °C
Temperature uniformity ±0.007 °C at -90 °C
Tank volume 22 and 50 liters 
Learn more about the OB-ULT calibration baths

Portable calibration bath

With their small dimensions, the portable micro-calibration baths are ideal for applications that need to be done in various remote locations.
Nevertheless, these portable mini-calibration baths offer exceptional performance as well as fast heating and cooling rates.

Features of the OBM and OBM-LT:

  • Portable use - independent of location
  • Usable immersion depth of 200 mm
  • Uniformity and stability in the mK range
  • Proven cooling system with compressor technology
  • Fluid ensures perfect heat transfer
Micro Calibration Bath OBM
Temperature range +35 °C to +220 °C
Temperature stability (°C) 

±0.005 °C at +50 °C
±0.008 °C at +100 °C
Temperature uniformity (°C)  ±0.02 °C at +50 °C
Tank volume 1 liter
Micro Calibration Bath OBM-LT
Temperature range -40 °C to +130 °C
Temperature stability (°C) 

0.007 °C at -40 °C
0.005 °C at +50 °C
0.008 °C at +100 °C
Temperature uniformity (°C)  ±0.02 °C at +50 °C
Tank volume 1 liter

Learn more about the Micro calibration baths

Ultra stable maintenance bath for resistance standards

Kambic Ultra-stable Maintenance Bath

The ultra-stable maintenance baths for reference resistors offer exceptional operating characteristics.


  • State-of-the-art metrological equipment with exceptional performance
  • Uniformity and stability in the mK range
  • Unique “Vertical flow design (VFD)”
  • Hinged, transparent cover
  • Multiple access ports
  • Two bath sizes available

Maintenance baths for resistance standards OB-60 US and OB-100
Temperature range +5 °C to +60 °C 
Temperature stability (°C) 

±0.003 °C at +23 °C
Temperature uniformity (°C)  Better than ±0.007 °C at +23 °C
Tank volume 60 and 100 liters

Learn more about the calibration baths for resistance standards


Calibrator with black body cavity for infrared thermometers

These black body calibration baths are ideal for calibrating infrared thermometers and thermal imagers, or other non-contact temperature sensors, over a wide temperature range. 


  • Black body calibrator 
  • Perfect solution for calibrating IR thermometers
  • Several shapes of Black Body Cavities available
                                                     OB-15/2 BB OB-15/2 BBLT
Temperature range +40 °C to 250 °C -20 °C to +130 °C
Temperature stability (°C) 

±0.003 °C at 100 °C

±0.006 °C at -20 °C
±0.005 °C at 0 °C
±0.003 °C at +100 °C
Temperature uniformity (°C)  ±0,007 °C at +100 °C ±0,007 °C at -20 °C
Tank volume 15 Liters 15 Liters

Learn more about Black Body Cavities for infrared temperature instruments

Kambic infrared calibrator

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What is a calibration bath?

A calibration bath is a machine equipped with a tank (bath), which allows a liquid to be kept at a precise specified temperature, using a combination of heating, cooling and circulation systems. Temperature sensors, probes and transmitters are calibrated in this liquid by comparison with a known temperature reference.

Here, the preset temperature should ideally match the actual temperature of the bath liquid. Even more important, however, is the stability of the temperature over time and the homogeneity of the temperature across the entire bath volume.

Compared to calibration in air, the advantage of the calibration bath is a much faster heat transfer via the fluid. In addition, more precise temperature control is possible. Calibration baths can offer stability and homogeneity of up to ±5 mK at temperatures ranging between -100 °C and +300 °C. This makes then the perfect equipment for the calibration of high-precision temperature probes, especially those of a more irregular shape that cannot be calibrated in block calibrators.

Common sizes for calibration bath tanks range from 1 to 60 liters. Bath fluids typically consist of special, temperature-stable silicone oil, particularly in high-temperature applications. High-purity alcohol is used in the ultra-low temperature ranges.

Selection criteria for a temperature calibrator

If you need to calibrate industrial temperature probes such as RTDs, thermocouples, thermistors, bimetallic thermometers, or glass thermometers, you need a reliable temperature source to verify accuracy. For calibration applications demanding the highest-quality, a fluid-based calibration bath offers a superior combination of stability, uniformity and value for money. 

Typical temperature block calibrators offer stability of around ±0.5 °C over a temperature range of -25 °C to 650 °C. The temperature uniformity between the individual wells, which is important for the comparison of sensors, typically sits at around ±0.05 °C. These uncertainties match the measurement uncertainties achieved by industrial temperature sensors well.

If you need an extended temperature range, highest stability and greater precision, calibration baths are the better choice. Compared to most temperature block calibrators, the Kambic calibration baths excel by having much better temperature stability of up to ±1 mK over a temperature range of -90 °C to +250 °C. The temperature uniformity of a liquid bath, which is a very important characteristic for the comparison of probes, is ±7 mK.

When selecting calibrators for your industrial sensors and probes, you should consider the following criteria:

• temperature range
• accuracy and stability
• flexibility of use and immersion depth of the probe
• portability
• throughput

Do you have general or technical questions about our calibration baths? Do you need more information or an obligation-free quote?
Contact us! 

Other topics that may interest you:

Kambic Air-Calibration Chambers

These temperature air-chambers stand out due to their exceptional temperature stability (to 0.005 °C) - ideal for refence resistors.

Humidity Calibrators

For calibration and validation of humidity probes and transmitters

Kambic Climate Chambers

Constant Climate Cabinets and Top-of-the-range Environmental Chambers - Kambic Metrology