The performance of direct liquid cooling (DLC) and immersion cooling systems depends on far more than coolant selection alone. Throughout development, qualification, production, and operation, fluid properties must remain within specification to ensure efficient heat transfer, reliable flow behavior, long-term stability, and safe operation.
Anton Paar provides laboratory and inline measurement solutions for every stage of the coolant lifecycle – from formulation development and quality control to continuous process monitoring and predictive maintenance.
E-Book - Advanced Characterization of Cooling Liquids for Data Centers
Learn how precise fluid characterization supports efficient, safe, and reliable liquid cooling throughout the entire coolant lifecycle. AI workloads and high-density computing are accelerating the transition from air cooling to direct liquid cooling and immersion cooling.
As heat loads rise, cooling fluids become critical operating assets whose condition directly affects thermal performance, system reliability, safety, and equipment lifetime. This comprehensive e-book explains how laboratory analysis and continuous inline monitoring help coolant manufacturers, equipment suppliers, and data center operators select suitable fluids, verify specifications, detect degradation, and make better maintenance decisions.
Measure coolant condition, maximize system performance
Water-glycol mixtures are the most widely used heat transfer fluids in direct liquid cooling systems. Maintaining their composition and thermophysical properties is essential for freeze protection, corrosion resistance, pumping efficiency, and reliable heat transfer.
Anton Paar supports DLC applications with measurement solutions for:
Glycol concentration (laboratory and inline)
Density and concentration
Viscosity and viscosity index
Specific heat capacity
Oxidation stability
Particle contamination
Colloidal stability (zeta potential)
Thermal interface materials
Continuous glycol concentration monitoring
Inline refractometers continuously monitor ethylene glycol or propylene glycol concentration directly in the cooling loop, enabling early detection of dilution, degradation, or contamination before cooling performance is affected.
Density measurements verify coolant composition, establish concentration-temperature relationships, and detect concentration changes throughout operation.
Particle sizing and concentration measurements identify contamination, agglomeration, and degradation products before they lead to fouling or blockage of critical cooling components.
Temperature-dependent viscosity measurements support coolant development and help optimize flow behavior in increasingly compact cold-plate and microchannel designs.
Characterize thermal interface materials under realistic assembly conditions. Measure bond line thickness (BLT) with controlled normal force compression to improve heat transfer, cooling performance, and device reliability.
Immersion cooling fluids require tight control of thermophysical properties and chemical stability. During qualification, production, and operation, manufacturers must verify that fluids remain within specification while maintaining long-term thermal and safety performance.
Anton Paar enables comprehensive characterization of immersion coolants through measurements of:
Density
Viscosity
Flash point
Oxidation stability
Specific heat capacity
Pour point
Distillation characteristics
High-precision density measurement
Generate density-temperature profiles, verify product specifications, and detect contamination or fluid mixing with exceptional sensitivity.
Evaluate specific heat capacity together with oxidation induction time (OIT) and oxidation onset temperature (OOT) to assess long-term coolant stability.
Anton Paar also supports thermal management systems surrounding data centers.
Oil circulation ratio (OCR)
Inline density and sound velocity sensors continuously monitor refrigerant-oil mixtures in chillers, refrigeration systems, and heat pumps, optimizing compressor lubrication and cooling efficiency.
High-pressure density and rheological measurements provide valuable input for compressor development and waste heat recovery using high-temperature heat pumps.
Multiparameter Coriolis flowmeters simultaneously measure mass flow, density, temperature, and coolant concentration, providing significantly more process information than conventional flow measurement alone.
Whether you are developing next-generation coolants, qualifying new formulations, manufacturing heat transfer fluids, or operating mission-critical cooling systems, Anton Paar offers a comprehensive portfolio covering both laboratory and inline measurements.
Laboratory characterization
Refractometers
Density meters
Viscometers
Differential scanning calorimeters
Particle characterization instruments
Rheometers
Flash point testers
Pour point testers
Distillation analyzers
Oxidation stability testers
Process instrumentation
Inline refractometers
Coriolis mass flowmeters
Together, these solutions provide complete insight into coolant composition, thermophysical properties, contamination, degradation, and process performance – helping manufacturers and operators maximize cooling efficiency, improve reliability, and extend coolant lifetime.
Measurement expertise you can trust
With decades of experience in measuring thermophysical properties and process parameters, Anton Paar supports coolant manufacturers, OEMs, and data center operators with accurate instruments, application know-how, and worldwide technical support.
Actionable process insights
Our measurement solutions go beyond reporting values. They detect contamination, degradation, concentration changes, and fluid aging at an early stage – helping operators optimize cooling performance, reduce maintenance, and prevent unplanned downtime.
Laboratory and inline solutions
Whether performing batch release testing or continuous process monitoring, Anton Paar combines laboratory instruments with inline sensors to deliver consistent measurement data from R&D to production and operation. This enables seamless quality control and real-time process optimization.
Complete coolant characterization
From glycol concentration and viscosity to particle contamination, oxidation stability, and flash point, Anton Paar provides analytical instruments for key measurements in coolant development, qualification, and monitoring.
We use cookies on our website. Some of them are necessary (e.g. for the shopping cart), others help us make our online content better and easier for you over the long term via analysis, external media, and marketing services. We also use third-party cookies from providers in the USA like Google or Facebook if provided with your consent (Art. 49(1)(a) GDPR). Your data may be transferred to the USA which does not have a data protection level comparable to GDPR. In this case your data may potentially be accessed by US Authorities for surveillance purposes and you may not be able to exercise effective legal remedies. You can accept or reject all cookies by clicking on the respective button or define your cookie settings using the link "Customize your cookie settings".
If you reject all cookies, only technically required cookies will be used. You can also withdraw your consent at a later time by accessing the Cookie Settings.
Marketing cookies are used by third parties or publishers to show you personalized advertising. They do this by tracking which websites visitors go to.
Content from video platforms and social media platforms is blocked by default. If you accept cookies from external media, accessing these contents no longer requires giving manual consent.
After being informed of potential risks for my data (including transfer to the USA and potential access by US authorities) in the Cookie Banner and Privacy Policy I accept the cookies from US-providers.
