A constant check is conducted for gas leakage from the fuel gas tube inside the gas control unit.
This section describes the method for inspecting for leakage from the gas piping (customer's equipment), the gas hose (standard accessory), and the gas piping that includes the gas control section inside the instrument.
WARNING: If a gas leak occurs, stop using the instrument immediately and request
your Shimadzu representative to inspect the instrument.
Continuing to use the instrument without taking action could lead to an accident.
1. Turn the power switch of the AA-7800/7000 OFF. Also start the compressor.
2. Open the main valves on the gas cylinder and compressor, and all the stop cocks.
3. Verify that the gas pressure is set correctly.
Fuel gas: Acetylene(C2H2): 0.09±0.01MPa
Support gas: Air, Nitrousoxide(N2O): 0.35±0.03MPa
4. Wait for at least 5 seconds, then close the main valves.
5. Read the indications of the pressure gauge between the main valve and the instrument in each case.
6. Read the indication of each pressure gauge after an interval of 30 minutes.
If the drop in pressure over 30 minutes at the fuel gas side is greater than 0.01 MPa, or if the drop in pressure at the assist gas side is greater than 0.02 MPa, it is judged that there is a gas leak.
NOTE
• If it is judged that there is a gas leak, apply soapy water or leak detection fluid (optional) at each connection between the gas cylinder or compressor and the gas control unit and burner to check the location of the leak.
• If a gas leak has occurred at a connection, make the connection again. If it is judged that there is a gas leak inside the gas control unit, stop using the instrument and contact
your Shimadzu representative.