MKS Granville-Phillips 358 series, Instruction Manual

Page: 28 / 122

Chapter 3
28
Series 358 Micro-Ion Controller Instruction Manual - 358013 - Rev. B
Figure 3-2 Location of Screws for Top Cover Removal
3.3 Pressure Units Setup
If units of measure are as desired (see Figure 3-1), skip to Changing Display
Update Rate on Electrometer Module on page 30.
3.4 Changing Units of
Measure for Electrometer
Module
Your unit will have been shipped from the factory preset to display the unit
of measure, Torr, mbar, or pascal, that you requested. Selection between
Torr and mbar units is done by adjusting the Micro-Ion gauge tube
sensitivity to the appropriate units. For example, a tube has a sensitivity of
20/Torr or 15/mbar. Thus, for this tube, adjusting the sensitivity for a display
reading of 2.0+1 will result in display of pressure in Torr (see
Sensitivity
Adjustment on page 99). Adjusting to 1.5+1 will result in display in mbar.
If you want to change pascal units, change the switch on the electrometer
module as follows:
1. Shut OFF power to the Controller.
2. Remove the top cover as described in Top Cover Removal on page 27.
3. Locate the Micro-Ion gauge electrometer module. See Figure 2-4 and
Figure 3-3.
4. Locate the Unit of Measure display units control switch.
Bracket
Do not remove the two
lower front screws