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ACM 150
•
Pump Enabled: The LEDs indicate adequate sample pump vacuum
•
Venturi: The LEDs indicate adequate venturi pump vacuum
•
Line Leak: Lights when the ACM 150 monitor is performing a Line Leak Test,
which may be initiated manually or automatically. In order for the Line Leak Test
to perform properly, check valves must be installed in the sample lines connected
to the ACM 150 monitor. This feature may be disabled via the configuration
software.
Control panel status
The three control panels on the ACM 150 monitor have the same Status LEDs. These
LEDs provide status on the following:
•
Power On: Lights to confirm that power is supplied to the valves or relays
associated with the Control Panel. This LED should be lit whenever the ACM 150
monitor is powered. Loss of power requires service attention.
•
Test Mode: Lights when selecting the Manual Mode or Frontpanel Mode on the
touchscreen.
•
Comm. Active: Flashes when the computer and the control panel are
communicating. Frequent communication is normal.
Figure 8. Control panel status LEDs
Cycle valves
When a sample area is selected by the computer, the corresponding sample valve
diverts the flow path from bypass to sample. The boost pump draws the air sample
in and pumps it to the gas cell. The boost pump connects to the gas cell through the
cycle valve assembly.
Solenoid valves S1, S2, S5, and S6 are the cycle valves. They control the flow path
of the air samples, ensuring the spent sample is evacuated from the gas cell and
filled with fresh sample before each analysis. They also switch to nitrogen during the
background cycle. The timing and switching is controlled by the computer using a
program that is configurable.
All valves are 24 VDC, 2-way, and normally closed (energized to open). These valves
are mounted on a removable plate.
Valves S1 and S2 contacting the air sample before it passes to the gas cell have
Teflon bodies, S5 and S6 are made of stainless steel.
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