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Monitoring of oil concentration in the refrigerant circuit

Decades of experience show that measurements in research, especially in the refrigerant circuit, are complex and complicated. Sampling is often difficult or not possible. Therefore, the ratio between oil and refrigerant must be estimated by indirect methods.

The goal is to find out how efficiently a cooling system operates depending on the oil concentration. The information obtained from the measurements provides insight into how the processes in the compressor take place and when it is no longer operational.

To carry out the measurements as precisely as possible, SensoTech has developed the inline solution LiquiSonic® OCR which brings unbeatable advantages.

What if the ratio between oil and refrigerant is known at all times with high precision?
What if no elaborate samples had to be taken to determine the oil/refrigerant ratio?

Measuring the refrigerator circuit with LiquiSonic® OCR

Through LiquiSonic® OCR Comprehensive information about the refrigerant process is continuously available. Permanent knowledge of the concentration ensures optimal process control, while quickly approaching the optimal oil/refrigerant ratio reduces the adjustment time.

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The optimal ratio of refrigerant and oil with LiquiSonic® OCR

SensoTech makes it possible to have precise knowledge of the concentration of compressor oil in refrigerant at any time. Accurate inline measurements eliminate the need for complex and error-prone sampling. Measurement values are available at all times and are updated every second.

Highest precision in monitoring oil in the refrigerant circuit

SensoTech places the highest value on precise measurements in monitoring oil concentration. The determination of the oil concentration is based on pressure, temperature, and sound velocity measurements in the liquid refrigerant. This highly accurate measurement principle allows precise adjustment of the desired oil circulation speed.

Continuous determination of the oil concentration instead of spot measurements

The great advantage of online oil condition monitoring is the permanent availability of the measurements. Due to the second-by-second updating of the data, the operator always has precise knowledge of the measured oil concentration. Time-consuming adjustment of the oil concentration in the circuit is thus a thing of the past.

Monitoring a variety of refrigerants with just one refrigerant measuring device

SensoTech impresses with sustainable and comprehensive process solutions. In total, up to 32 product data sets (calculation models) can be stored in the controller. This makes it easy to cover a wide range of refrigerants with the LiquiSonic® measurement technology to monitor. Due to decades of experience and manufacturing of measuring devices, there is almost no refrigerant left that has not been measured by SensoTech.

Determination of the oil concentration in the refrigerator with LiquiSonic® OCR.

Selection of measured refrigerants

  • R134a
  • R407c
  • R410A
  • R744
  • R1234yf
  • R1234ze
  • R290 (Propane)
  • R1233zd (E)
  • R407A
  • R404A
  • R454-B
  • R454-C
  • R717 (Ammonia)

Selection of measured compressor oils

  • D11
  • ND12
  • PAG
  • ACC-HV
  • POE 68

Holistic support for the analysis of oil in the refrigerant circuit

  • Clarification of the framework conditions
    First, it is discussed with the user which medium is to be measured. The SensoTech engineers check whether the combination of refrigerant and oil already exists in the existing database. If this is not the case, the feasibility of the measurement is determined in the in-house laboratory.
  • Clarification of the specification for the measurement of oil in refrigerant
    Once the measurement task is clear, specifics are clarified. Among other things, whether special materials, installation variants, or special accessories are required for monitoring in the refrigerant circuit. The system developed for this application LiquiSonic® OCR system already has a special measuring head and an adapter vessel. This equipment enables seamless integration into the refrigerant circuit.
  • Installation qualification on site at the refrigerant circuit
    Upon request, SensoTech supports the entire process. Our application engineers check the correct installation of the measurement system and verify that the initial measurements are correct.
  • Regular training and further education
    For various applications, SensoTech offers additional webinars and training. This gives the operator the opportunity to get to know the measurement system in advance or to discover new functions afterwards.
  • Provision of new datasets for oil in refrigerants
    The LiquiSonic® measurement system is not limited to a specific refrigerant or oil. As part of investigations, different refrigerants, such as refrigerant R32 and R134a, are analyzed in SensoTech's in-house laboratory. The use of another refrigerant at a later stage is not a problem. For this, SensoTech simply calculates a new dataset, loads it onto the controller, and the oil content in the new refrigerant can be determined.
  • Consultation on follow-up projects
    For questions about projects or other applications, the competent team at SensoTech is available for consultation.

Application examples of already measured refrigerants

There are countless refrigerants in use worldwide. As a globally operating company, SensoTech has already implemented countless projects with partners.

Oil circulation rate in R410A

    • Mainly used in refrigeration and air conditioning systems as well as in heat pumps in buildings
    • Very precise inline determination of oil concentration
    • Replacement refrigerant for banned R22 systems

    Refrigerant analysis for R1234yf

      • 357 times more climate-friendly than other used refrigerants
      • Used as a replacement for R134a in new cars
      • More efficient operation at higher temperatures
      • Used in automotive air conditioning systems

      Oil in refrigerant R134a

        • Banned in new cars within the EU, thus often used outside the EU
        • Worldwide use in automotive air conditioning systems
        • R134a is considered the standard reference worldwide

        FAQ on determining the concentration of refrigerant oil

        For questions about measuring the oil concentration in the refrigerant circuit or about the measurement system LiquiSonic® OCR the competent team of SensoTech is available.

        Frequently asked questions:

        • Why is sampling for determining the concentration of the refrigerant-oil mixture problematic?
          Sampling to determine the concentration is inaccurate and cumbersome as it interferes with the closed system. In general, refrigerants evaporate as soon as they come into contact with air. The samples amount to about one liter. The analysis takes place in the laboratory. The concentration of oil in refrigerant to be determined is only available after some time and is only a snapshot. The missing sample quantity ensures that the determined measured value does not reflect the current concentration. The systemmust first stabilize again. A real-time inline monitoring is therefore preferable to sampling.
        • What is the purpose of the oil in a refrigeration system?
          The oil in the refrigeration system lubricates the compressor and ensures that it operates smoothly and does not get damaged. It is important to maintain the perfect mixture ratio of oil and refrigerant. The rule is: as little oil as possible, but as much as necessary. Too much oil can reduce the cooling performance, among other things.
        • What happens if there is too much oil in the AC system?
          If there is too much oil in the AC system, it results in a reduction of cooling performance. This reduction means that the AC system only works to a limited extent, requiring more time to reach the desired cooling or the desired temperature may not be achieved.
        • What type of oil is used in the refrigerant?
          There are a variety of combinations of oil and refrigerant used in different compressors. The exact type of oil used depends entirely on the compressor manufacturer, as the respective compressors are only suitable for certain oils.
        • Can the refrigerant in the air conditioning system be replaced with another?
          While measurements can be taken with any known refrigerant, not every refrigerant can be used in every air conditioning system. If a different refrigerant than the previous one is used, it can attack and damage the compressor seals.

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