| 摘要 |
A device for testing and diagnosing air-conditioning apparatus of a car in the preferred embodiment comprises an control unit (1), indicated as CPU and having a microprocessor; a first sensor (2) for measuring the low pressure LP upstream of the compressor; a second sensor (3) for measuring the high pressure HP downstream the compressor, a third sensor (4) for measuring the environment temperature Ta; fourth sensor (5) for measuring the temperature Ti at the air outlet in the car; possible sensors of auxiliary temperatures (5a and 5b); a couple of connectors (6a, 6b) for measuring the voltage at the ends of the clutch cycling switch in orifice tube system with clutch cycling switch; a sensor of relative humidity (7); a data input unit (8), such as a keyboard; a unit (8a) for displaying the data, such as a alphanumeric LCD, and/or a printing unit (8b); a connector of type RS232 for communicating with a computer; an external memory unit (9), in particular a memory card, with relative interface. The device is capable of working with any type of system installed on vehicles.
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