946 Controller Instruction Manual
pg. 36
Setup Convection Pirani Gauge C2
Gas Type
Auto Zero
Relay
Relay 12
Relay 11
N2
Enable
DIR
SET SP
ABOVE
Hyst
ENABLE
1.0E-02
9.0E-03
BELOW
CLEAR
3.0E-01
3.3E-01
NA
FD
NO
Manual Zero
CP
Message
Box
Auto-detected
Auto-detected
ATM Value 7.6E+02
ATM Cal
NO
Sensor
Figure 6-9 Pirani/Convention Pirani Setup Information Screen
1. Sensor
The Sensor Type (Convection Pirani or Pirani) is often auto-detected during the initial power up. If
the sensor type is auto-detected, the sensor type cannot be changed from the front panel. Should
the auto-detect fail, the sensor type can be selected manually, and stored in the memory. This
information will be used as the default sensor type if sensor power is cycled.
Note that a Sensor ON/OFF sequence should be performed after manually entering the
gauge type.
2. Gas Type
Select the gas type by moving the cursor to the Gas Type box and pressing
Enter
key. Use the
or the
keys to select the gas type being used with the sensor. Three gas types (N
2
, Ar and
He) can be selected. The default setting is N
2
which is also used for air.
3. FD (Factory Default)
When YES is selected and entered for Factory Default, any Manual Zero and ATM Cal values are
removed and the Zero and ATM values restored to the factory default ones.
A small
U
under the sensor type indicator (PR or CP) on the front panel LCD display will be
removed when default values are restored.
4. Auto Zero
Use the
or the
keys to select a valid gauge for autozeroing the Pirani (PR) or Convection
Pirani (CP). Only cold or hot cathode sensors can be used as the zero reference.
The zero will be executed only when:
(1) The system pressure per the CC/HC is less than 1X10
-5
Torr (1x10
-6
Torr for the PR).
(2) The Convection Pirani (or PR) reading is lower than 1x10
-2
Torr.