MKS Stabil-Ion 370 Series, Instruction Manual, Page: 86 / 122

4 Preparing the Stabil-Ion System for Operation
4-28
Series 370 Stabil-Ion Instruction Manual - 370119
4.8 Ionization Gauge Auto Turn ON/OFF
If a Convectron Gauge is exposed to the same pressure environment as a Stabil-Ion Gauge, then the
Convectron Gauge may be used to automatically turn ON the IG. Convectron Gauge A can turn
ON IG1 and Convectron Gauge B can turn ON IG2. Stabil-Ion Gauge automatic turn-ON occurs
when the Convectron Gauge pressure drops below the auto turn-ON setpoint defined by the auto
turn-ON setting. The Stabil-Ion Gauge will also be turned OFF automatically when the pressure
rises slightly above the auto turn-ON setpoint if the electrometer overpressure setpoint does not trip
first.
The automatic ON/OFF function will execute only once per setpoint crossing. For example, if the
IG is turned OFF manually when below the setpoint, the auto-ON function will not turn it back ON
until the Convectron Gauge pressure has risen above the setpoint and then dropped below it again.
4.8.1 To Set the ON/OFF Pressure for IG1/IG2
1. Place the AUTO switch for IG1 in the SET position. See Figure 4-15.
2. The existing turn ON pressure is displayed on the A display.
3. Set the desired turn ON pressure with the AUTO adjustment for IG1.
4. To deactivate this capability place the AUTO switch for IG1 in the
OFF
position.
5. Set the Convectron Gauge B/IG2 function the same way.
Do not leave either switch in the SET position as this prevents pressure from being displayed.
Warning – If used improperly, Convectron Gauges can supply misleading
pressure indications that can result in dangerous overpressure conditions
within the system. For use with gases other than air or N
2
, consult the gas
type correction charts in Section 4.7.1 on page 4-19, or use a Memory
Module programmed with data for the specific gas being used.
Figure 4-15 Control Unit Front Panel (with Door Open) Showing Ionization Gauge
Auto Turn-ON/OFF Switches
O
I G 1
O
Degas
O
Power
O
I G 2
Data Port
IG1 L F1
N2 TORR
▲
▼
Cancel
Select
IG-1 AUTO
SET OFF
ATM
VAC
IG-2 AUTO
SET OFF
ATM
VAC
CONVECTRON ELECTROMETER PROCESS CONTROL RS-232
Off SP On
▲
▲
▲
▲
▲
▲
Off SP On
1
2
3
4
5
6
3
Set