8
2.9.
Electrical safety
Tools are required to access sections of the ACM 150 monitor with electrical connections.
An appropriately sized ball driver or Allen wrench is needed to access the interior portions
of the enclosure. A Phillips screwdriver is required to access the power cords at the AC
power distribution unit, located immediately behind the computer door. A Phillips
screwdriver is also needed to open the main power disconnect switch on the top of the
cabinet. There are no hardware or electrical interlocks on the ACM 150 monitor.
A “Lockout/Tagout” power isolation box is installed on the top of the monitor’s enclosure.
Before any electrical repair work is started, turn the knob to the “0” position to isolate the
main power to the monitor. To return power to the monitor, turn the knob to the “1” position.
Electrical energy may be stored within the system if it is necessary to enter any electronic
areas. Allow sufficient time for any power to discharge, and use a voltmeter to check
before doing any work in the area. Do not perform internal electrical work on the monitor
without using the correct procedures (Lockout/tagout (LOTO) disconnect). Lock out and
tag out the main power switch per local safety procedures.
The user must provide a circuit breaker for the main power supply per local electrical codes.
2.10.
Hazardous Energy Isolation
The ACM 150 monitor uses high-pressure CDA (compressed clean, dry air up to 100 psig)
and low-pressure (5 psig) nitrogen. Both 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 purges the sample gases between analysis cycles and is
plumbed to the solenoid valve assembly next to the optics bench inside the cabinet.
The customer is responsible for installing external lockable manual isolation valves for the
CDA and the nitrogen supply. The valves should be visible, easily accessible, properly
labeled, and close to the monitor. A pressure gauge to indicate the supply pressure
visually is recommended.
The ACM 150 monitor optics bench includes a class 1 laser. Electrical power should
always be disconnected during maintenance procedures that involve servicing the optics
bench or its components.
The noise generated during the ACM 150 monitor operation has been measured to be
less than 70 dB.
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