Generally, the vacuum pump status would be controlled within the instrument start up process, and likely in a start up script. There is no reason to turn off the high vacuum pump during system operation. For most GCMS systems, you want to have the system maintained at high vacuum for several hours to several days prior to running samples. If the system start up script or process has been run, and there have not been any interruptions of power, the diffusion pump should be on. If the diffusion pump is turned on, or commanded on, it should be hot, unless there is a fault in the heater control circuit. Doing a complete system shut down, followed by the system start up procedure would be a first step in getting back into operation. If this does not work, then it is likely that your system is in need of repair.

Hi Sir;

First of all you should make the vacuum pumps as pressure to decrees and the column should be at 30 C. After that insert your methods to the PC of the MS software and applied it

Before the turning on of the diffusion pump a base vacuum must be required so check first the initial vacuum given by the external pump. Normally the software of the equipment allow you to see that value. Is that value is higher it will never allow to star the process of turning on the diffusion pump.

Why could be higher? pump it is not working well, leaks in the septum, leaks in the fitting of the column, leak in the interface or incorrect close of the chamber after maintenance.

best,

This should be written in the handbook of the instrument

Are you sure that the pump does not work and you have a high vacuum in your system?

If the vacuum status is the same as before, then this could be a software problem. A simple solution is the software restarting and running a method other than the current method.

If the problem persists, shut down the instrument by using the software. After that

start up the instrument through the software again.If there is no hardware problem, the pumps will start working as usual.

If none of these work, there is probably a serious problem with the pump, so you should contact the manufacturer service.