lav877 wrote:
Thank you, I carefully read the link you suggested. I have at my disposal two capillaries resistive and non-resistive. I also tried several ways of washing, including the one described in the discussion. Unfortunately it did not bring any results. That is why I turned to a respected community, I just have no more ideas where to look for a problem.
The only problem diagnosed by the device itself is the inability to set the value of the HEX2 RF parameter in the collision cell, which is the default. This is 650V. I just set the value to 500V, I passed the autotune procedure, and the device works without giving an error message. Perhaps due to a malfunction of the electronics unit, this value is also subject to drift during operation of the device, which causes a decrease in the signal during operation. This is just the only version I have about the observed problem. But I do not know how believable it is.
If the voltage is drifting on the HEX RF it could be a power supply problem or a problem on the control board. I had an Agilent 7500ICPMS that had a drifting sensitivity problem, it would become twice as sensitive over night as it ran, turning off the plasma and starting over would bring it back to normal. I finally noticed that while the Electron Multiplier voltage was set to 1800v, and the setting would remain the same, the readout in diagnostics would show that after about 5 hours the voltage was actually 2200v while the setting was 1800v. Once the control board was replaced it was a very steady instrument for years.
I would have Agilent take a look at the drifting voltages just to be sure.