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Figure 3-8
Relay 2 behavior
Setpoint 1: Convectron
gauge
®
Convectron
ATM Vacuum Gauge Module Instruction Manual
Activate
Deactivate
Activated
Deactivated
If the module will measure the pressure of any process gas other than N
air, you must adjust setpoint 1 for the process gas that will be used.
The true pressure of a gas other than N
from the pressure that the output indicates. For example, outputs might
indicate a pressure of 10 Torr for argon, although the true pressure of the
argon is 250 Torr. Such a substantial difference between indicated pressure
and true pressure can cause overpressurization resulting in an explosion.
Failure to use accurate pressure conversion data for N
or air to other gases can cause an explosion due to
overpressurization.
If the module will measure any gas other than N
connecting relays to system control devices, adjust setpoints for
the process gas that will be used.
Test points on the module front panel, Table 3-5 on page 22, and
Figure 3-10 and Figure 3-11 on pages 29–30 enable you to determine the
amount of voltage that corresponds to a specific pressure.
1.
Make sure the module is properly installed, the axis is horizontal (see
page 8), and the power supply is ON.
2.
Figure 3-10 and Figure 3-11 are graphs that show test point voltage
versus pressure for N
voltage versus pressure for 12 commonly used process gases, including
N
and air.
2
Time
Relay
activated
or air may be substantially different
2
WARNING
or air. Table 3-5 on page 22 lists test point
2
Analog Module Operation
8 Torr
hysteresis
or
2
2
or air, before
2
27
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