What are acceptable turbo currents on ion traps?

What are acceptable turboe currents for ion traps?

Lower cost ion traps such as 220 MS and Saturn 2000 do not have either foreline gauges or high vacuum gages to montor high or low vacuum.  For these instruments, a good indication of vacuum is turbo current.  The idea is that the harder the turbo works (more current it draws) will be an indication of a leak.  This is generally very accurate for spotting leaks

Model                  Spec
240/4000             <280 mAmp
Saturn 2000        <280 mAmp
220  MS               <350 mAmp
225 MS                <200 mAmp

The 220 has a different controller thena the Saturn 2000.  The 225 has an IPS (integrated pumpling solution) and roughing pump is in closer proximity to the turbo.