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Programming and Operation
Parameter Lock
Zero Auxiliary Thermocouple
3-38
The eighth parameter of the SERVICE function prevents an unauthorized
user from accessing all programmable REGEN parameters and relay
setpoints. When an attempt is made to change a programmable setpoint
with Parameter Lock ON, the CHANGES LOCKED message is displayed
as shown in Figure 3-35. All parameters which can be turned ON or OFF,
including Regeneration, are still accessible with Parameter Lock turned
ON.
Last
3
1
2
Next
4
5
6
Clear
7
8
-
0
Figure 3-35: Parameter Lock ON Display
The ninth parameter of the SERVICE function, as shown in Figure 3-36,
resets the auxiliary thermocouple gauge to zero. The auxiliary
thermocouple gauge reading is displayed until the gauge is set to zero.
NOTE: The auxiliary thermocouple gauge must be turned ON and under a
vacuum of less than 10
be used. Any attempt to zero the gauge at a pressure above 30 microns, or
when the gauge is turned OFF, results in a calibration failure.
Last
1
3
2
Next
4
5
6
Clear
7
8
-
0
Figure 3-36: Zero Auxiliary Thermocouple Display
PARAM LOCK OFF
MONITOR
CONTROL
REGEN
RELAYS
9
SERVICE
HELP
Enter
oo
®
.
ON-BOARD
-4
torr (less than 1 micron) before this parameter can
ZERO AUX TC
MONITOR
CONTROL
REGEN
RELAYS
9
SERVICE
HELP
Enter
oo
®
.
ON-BOARD
-
C
TI
CRYOGENICS
HELIX TECHNOLOGY CORPORATION
P/N 8040406
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