HELIX GRANVILLE-PHILLIPS Convectron ATM, Instruction Manual

Page: 39 / 98

Analog Module Operation
Convectron
®
ATM Vacuum Gauge Module Instruction Manual
31
Be
for
e
You Beg
in
In
stallation
A
na
log O
per
atio
n
R
S–48
5 Op
er
ation
M
ain
te
n
a
n
ce
Setpoint 2: differential
pressure sensor
Refer to Figure 3-12 and use a a high-precision, high-input impedance
(Z
in
> 1 M
Ω
) DVM to adjust relay 2.
1. Use the following equation or the data in Figure 3-12 to determine the
analog output voltage that corresponds to the differential pressure, in
Torr, at which relay 2 will activate and deactivate:
Figure 3-12 Setpoint relay 2 (differential pressure sensor) analog voltage
Output voltage 4.000 P
differential
0.004 V
×
+ =
-1000 -750 -500 -250 0 250
0
1.0
2.0
3.0
4.0
5.0
6.0
Differential Pressure (Torr)
Setpoint 2 testpoint v
oltage