I have an Optima 5300DV ICP OES. I am having problem of the plasma not igniting. We started having problem three months ago when the plasma kept turning on and off in the middle of the day while instrument is running. When I turned the plasma back on it will not ignite. I have to clean the shear gas nozzle and for a little while that helped. A week ago we changed the compressed air filter trap for shear gas ( we are using air as shear gas). While changing, we noticed that there is a trace of water in the line going to the instrument. Then our problem started. Plasma will not ignite. It give an error message “Plasma fails to ignite”, “ Shear gas is still flowing”, and “Shear gas will not shut off”. I found a topic here about plasma is not igniting. I check all the obvious like make sure that there’s leak, checked that the ignitor contact finger is making contact with the tape on the bottom of the torch glassware and I checked ignitor ground. Check the exhaust vent is operating properly and is not blocked. Checked the torch connection, RF coil for condensation, argon supply is on, injector is not clogged, optic interlock is centered over the torch and check that nebulizer end cap and fitting are tightly secured to the spray chamber. Plasma is still not igniting.
What am I doing wrong? Please help!