During 7700 ICP-MS optimization, my electron multiplier failed. What might be the issues and how do I resolve this? Can I still analyze sample if my method tune passed?
Find maintenance, best practice, and troubleshooting articles.
During 7700 ICP-MS optimization, my electron multiplier failed. What might be the issues and how do I resolve this? Can I still analyze sample if my method tune passed?
Hi
Log a service call..Look like life time of electron multiplier reached so giving error.
So i will suggest to call your local agilent support to check it onsite.
From your query, look like electron multiplier need to change..
I have moved this for better visibility.
I would check the pulse and analog HV values. If they reached ~ 1800V and 3300V accordingly, you will need to replace the EM detector. If EM tune fails but your calibration is fine, you can still measure. You just need to be sure that EM is replaced soon, if the thresholds are reached for pulse and analog regions.
Hi emreretoprak,
I have just replaced the electron multiplier myself at ICP-MS 7900. I have reset the EM and done an EM auto setting. I've got discriminator at 3.6 mV, analog 2197 and pulse 950 V. I have done a PA factor adjustment in batch, but on the tune report generated the sensitivity has gone down by half using the same lenses voltages and plasma conditions. Before the change we had 59 and 89 sitting at around 1000cps and 205 at around 2000 cps. Any suggestion?
Hi,
assuming all cables are correctly installed, and none is missing, the most common issue is, that the washers from the fixing screws are under the baseplate of the EM.
They need to be on top of the baseplate, so that the EM is flat on ground.
Hi cschulz,
Thank you for your help. I opened again to check and two of the wires were touching some metal on the detector. It seems to be okay now.