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2 Initial Setup Procedures
Table 2-3
Relay Polarity Switch Settings
Switch
Settings
1
1
2
2
3
3
Channel
Activated
Pressure
Indication
Relative to
Setpoint
Switch
Settings
OFF
6
below*
4
ON
6
above
4
OFF
5
below*
5
ON
5
above
5
OFF
4
below*
6
ON
4
above
6
Channel
Activated
Pressure
Indication
Relative to
Setpoint
OFF
3
below*
ON
3
above
OFF
2
below*
ON
2
above
OFF
1
below*
ON
1
above
* factory setting
2.1.3.3 Process Control Tips
1.
The process control override switches can be used to hold relays on or off during initial turn
on or during non-typical process conditions.
2.
When IG1 and IG2 are off, setpoints 1 and 2 are inoperative.
3.
When Convectron Gauges are disconnected, setpoints 3-6 are inoperative.
4.
The status of relays 1 and 2 will not change during degas. They function as if the pressure
reading was frozen when degas began.
5.
Relay actuation occurs when the second digit pressure indication differs from the setpoint
value by one display unit. A 10% hysteresis is automatically programmed into each setpoint
for returning pressures. Table 2-4 illustrates this using an assumed setpoint pressure and
assuming the polarity is set for falling pressure activation.
Table 2-4
Setpoint Hysteresis
Setpoint Pressure
Pressure Change
Relay Actuation Pressure
6.30 X 10-7
Falling
6.29 X 10-7
6.30 X 10-7
Rising
6.30 X 10-7 + 10% = 7.00 X 10-7
2-7
Series 370 Stabil-Ion Instruction Manual - 370119 - Rev. 05