Malvern Mastersizer Series Getting Started page 158

A P P E N D I X C
Remote interlock
The Mastersizer does not require an external interlock switch to comply with
CDRH or EC laser safety regulations. However, some company safety regulations
may require the room in which the Mastersizer is installed to be protected so that
if the door to the room is opened then the laser in the optical unit is disabled.
The Mastersizer allows you to do this by using the "Remote" connector socket on
the transmitter end panel. This socket is shown in the diagram below À.
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If no remote interlock is to be used then the connector is fitted with a shorting
plug that will enable the laser to be switched on.
It should be noted that the continual interruption of the power supply to the laser
will reduce the life of the laser. To solve this problem an interlock switch system
similar to the circuit diagram below is recommended.
In this system there are two switches. The first À is a normal interlock switch that
is attached to the door of the room that will disable the laser when the door is
opened. The second switch Á is a "spring return" type manual override switch
that allows the user of the Mastersizer to keep the laser power on if they know
that someone is going to enter the room. Using this configuration will reduce the
number of times the laser is switched off by only disabling the laser when
someone unexpectedly enters the room. The circuit is connected to the remote
socket using a standard 3 pin DIN plug.
P a g e C . 1
G E T T I N G S T A R T E D