Honeywell ACM 150 Manual To Installation, Operation, And Maintenance page 12

ACM 150
Hazardous Energy Isolation
The ACM 150 monitor uses both high pressure CDA (compressed clean dry air up to
100 psig) and low pressure (5 psig) nitrogen. Both of these energies may be stored
inside the monitor and must be relieved before performing any maintenance work
involving the pneumatics. The CDA is used by the venturi vacuum generators located
inside the main enclosure behind the computer door. Nitrogen is used to purge
the sample gases between analysis cycles and is plumbed to the solenoid valve
assembly located next to the optics bench inside the cabinet.
It is the responsibility of the customer to install external lockable manual isolation
valves for both the CDA and the nitrogen supply. The valves should be visible, easily
accessible, properly labeled and close to the monitor. It is recommended that a
pressure gauge be installed to visually indicate the supply pressure.
Refer to the installation instructions i for additional details and precautions. A
class 1 laser is part of the ACM 150 monitor optics bench. During any maintenance
procedures that involve servicing the optics bench or its components, electrical
power should always be disconnected.
The noise generated during operation of the ACM 150 monitor has been measured to
be less than 70 dB.
Compressed Air Isolation
Compressed air can be isolated by ensuring that during installlation or setup of the
ACM 150 monitor compressed air isolation valves for the supply have been installed.
Since each site's requirements vary, it is up to the end-user to provide this isolation.
Compressed air stored energy can be removed by first shutting off the air supply and
then allowing time for the pressure to bleed down. Under normal automatic operation
the pressure should bleed down through the venturis in seconds. Under manual
operation, it may be necessary to actuate the venturi supply solenoid valve briefly
to bleed off the pressure. Pressure gauges are provided on the venturi manifold
assembly to help verify that the pressure has been relieved.
Nitrogen Isolation
Nitrogen under low pressure purges sample gases between cycles. It also provides
continuous purging of the optics bench mirrors through a small orifice. Shutting off
the nitrogen supply should relieve any stored pressure through the optics bench
purge without any further actions.
Emissions
The ACM 150 monitor does not emit or generate hazardous levels of ionizing/non-
ionizing radiation or audio noise.
Ergonomics
Ergonomic factors such as the height and weight of the monitor do not pose a
significant hazard. The height of the monitor should be at a comfortable level, with
the computer approximately 4 feet above the ground. It is recommended that a work
stool be used while working for long periods.
There are two heavy components that may need infrequent servicing or replacement
every few years.
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