Inline analytical technology for oil or refrigerant concentration in the cooling cycle and detection of product leakages
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expansion valve Measuring point Measuring task monitoring of cooling circuit Cooling circuit Introduction Compressor-based cooling systems are often used in air-conditioning. Within these systems, there are circulating refrigerants such as R134a, R1234yf or CO2 that are ideal as a heat transfer medium due to their thermodynamic properties. In addition, to the refrigerants, refrigerator oils can also be found in the cooling circuit to lubricate the compressor. Cooling systems consist of four main components: ·· expansion valve ·· evaporator ·· compressor ·· capacitor Depending on the type and use of the cooling system, there are a variety of combinations of oils and refrigerants. Whereas a high percentage of oil is for a good lubrication, it also reduces the efficiency of the cooling system. Therefore, the aim is a perfect mixture of oil and refrigerant. The LiquiSonic® measuring technology monitors the concentration of the oil in the cooling circuit. Moreover, the measurement include temperature and pressure to provide a compensated measuring result. In the cooling circuit, the gaseous refrigerant (R134a or R1234yf) is compressed and condensed by a compressor. The pressure and the temperature increase strongly. The heated refrigerant is then passed through the capacitor, where the heat is extracted. The capacitor is outside the passenger compartment. The expansion valve reduces the high-pressure of the liquid. Thereby, the refrigerant is evaporated completely and releases the cold in the evaporator to the environment. For example, in the car the evaporator is located in the passenger compartment. On the low pressure side, the gaseous refrigerant regresses to the compressor where the circuit starts all over again.

Cooling circuit Customer benefits Based on the sonic velocity measurement, the LiquiSonic® 30 analyzer enables a precise determination of the oil concentration in the cooling circuit and of the temperature as well. This affects the following aspects positively: ·· optimum heat transfer in the evaporator and capacitor ·· maximum enthalpy of vaporization of the refrigerant ·· prevention of unintended increase in temperature at the compressor caused by viscosity increasing The continuous monitoring of the oil content in the refrigerant puts high requirements on the analysis. Since the...

Cooling circuit 21001301 controller 30 V8 21004435 BUS connection: Profibus DP 21003271 immersion sensor 24-08, DIN DN25 PN40, V150, separated housing 21004322 desktop housing for controller 21004331 T-adapter for refrigerant measurement PN40 21004202 bus cable indoor (100 m) 21004725 pressure transmitter 0 - 25 bar abs. SensoTech GmbH Steinfeldstr. 1 39179 Magdeburg-Barleben Germany SensoTech Inc. 1341 Hamburg Tpk., Suite 2-3 Wayne, NJ 07470 USA