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ETP Electron Multiplier for your Agilent 5971, 5972, 5973 & 5975 GC/MS

18 Oct 2011


After several technical service calls in the span of only a few days and my own good and bad experiences with electron multipliers I’m prepared to offer you helpful hints for your Agilent 5971, 5972, 5973, & 5975. We first tried out an ETP on the advice of customers and it wasn’t long after that we had switched several of our Agilent instruments over to the ETP Electron Multipliers (EM). We and many of our customers have found it to be a sensitive and linear electron multiplier with good longevity, but you will have to try it yourself.

a machine on the counter
Figure 1

There are two major differences when replacing the factory EM with an ETP EM on an Agilent 5971 (and an Agilent 5972). A slight bend of a prong is required to provide clearance from the dynode and there are two unused mounting posts as shown in figure 1.

a machine with a screen
Figure 2

Figure 2 shows the EM mounting to the end of the quadruples.

Two things to remember on this installation: make sure the active dynode film is fully seated and make sure the high voltage line is not grounded (figure 3). The brass colored female connector should not be touching any parts of the detector.

Read the instructions that come with your ETP EM and follow these simple tips and you will be on your way to running samples. And don’t hesitate to contact us if you need any help.

a machine on the counter
Figure 3