8
ZERO
ZERO
AUTO CAL
ZERO
NEXT
-
+
RESET
CYCLE
SNIFFER
SET POINTS
SPECTRO
MAINTENANCE
OTHER
F1
F3
F2
F4
10
mbar
hPa
Torr
-3
10
-12
10
-11
10
-10
10
-9
10
-8
10
-6
10
-5
10
-4
10
-3
10
-2
10
-2
10
-1
1
10
1
10
2
10
3
COR
mbar.l/s
STDBY
INLET PRESSURE
LEAK RATE
EVAC
TEST
Pa.m
3
/s
Torr.l/s
10
-7
Zero function
Deactivation of zero function:
The digital display shows the standard He signal.
Use Helium signal analog scale.
Analog display:
When zero function is activated, use the Helium signal zero scale.
The He signal zero scale displays 2 leds signal centered around the zero value.
Example:
2 leds flash
1 . 10
-7
1 . 10
-8
1.1 . 10
-7
9 . 10
-8
2 . 10
-7
Purpose
: the zero function offers the operator the possibility to detect small leaks that are
smaller than the helium background.
Activation of zero function
: connect the part or installation to be tested.
Operator could find an example in the Operating manual
C 540
CYCLE
on the digital display, the detector He background displays.
ZERO
ZERO
the digital display becomes 0.0E-00. On and after this time, it will display only
Helium variation.
