Pfeiffer Vacuum ASM 310 - RS-232 Serial link

Logarithmic (0/10 V)
Examples Example 1
Low decade at 10
-12
(0 V = 1 · 10
-12
) -> D
0
= -12
●
V = 3.91 V -> Leak rate = 10
(3,91 - 3)
x 10
(3 - 12)
= 8.13 · 10
-9
●
V = 8.25 V -> Leak rate = 10
(8,25 - 8)
x 10
(8 - 12)
= 1.78 · 10
-4
Example 2
Low decade at 10
-10
(0 V = 1 · 10
-10
) -> D
0
= -10
●
V = 3.91 V -> Leak rate = 10
(3,91 - 3)
x 10
(3 - 10)
= 8.13 · 10
-7
●
V = 8.25 V -> Leak rate = 10
(8,25 - 8)
x 10
(8 - 10)
= 1.78 · 10
-2
Graph
Curve got with low decade = 10
-12
Curve got with low decade = 10
-10
10
10
-12
10
-11
10
-10
10
-9
10
-8
10
-7
10
-6
10
-5
10
-4
10
-3
10
-2
9
8
7
6
5
Measured voltage
Tracer gas leak rate
4
3
2
1
0
Inlet pressure
The “Inlet Pressure” output corresponds with the inlet pressure source.
The leak detector is equipped with an internal gauge (2.5 V/8.5 V).
Formula U = Voltage measured (V) on analog output
Inlet pressure = 10
(U -5,5)
hPa
Graph
10
10
-3
10
-2
10
-1
10
+0
10
+1
10
+2
10
+3
9
8
7
6
5
Measured voltage
Pressure (hPa)
4
3
2
1
0
12.3 RS-232 Serial link
Refer to the Operating instructions of the RS-232 Serial link (see chapter “Applicable documents”).
Appendix
93/98