ATLAS TRACKER PIXEL AND SCT - COOLING OF THE ELECTRONICS
Phase II - Extensive Tests with Haug Compressor 4 cylinders
Typical Run

First 8 mn are heating up at 40°C of the cylinders. During this time the by-pass valve of the compressor is open and the valve 3 is closed. Then the by-pass is closed and the valves 2 and 3 are open.

During the first part of the test, the expansion valve is open at 1/8 turn, and then 1/4 turn.

The inlet pressure in the buffer tank is controlled by the inverter (frequency change) via an autotune PID controller and a pressure transmitter during all the test.

Except the expansion valve and the heater, all the sequences are controlled by the PLC.