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Figure 1 Source 12 Radiation Interlock PCB
Radiation Interlock.
The shutter and the flags are on the same plane. In theory, if the shutter were closed and the flag or
flags actuated, they could push open the shutter permitting radiation to escape. The board prevents
either flag air valve from receiving +24V when the shutter is not activated; lessening the chance
of this fault condition.
Versions
There are two versions of the board -00 and -01; the difference is for the various radiation warning
lamps employed. The -00 version requires low current to operate the shutter and is used with such
scanners such as the 09208000 (those with LED radiation warning lights). The -01 version is designed
to be placed in series with four incandescent red rad lamps such as the ones found in the 092040XX
and 092106XX (those with incandescent radiation warning lights).
LEDs
A red led illuminates when the shutter air valve receives power and amber LEDs are illuminate when
the flag air valves receive power. These are clearly labeled "SHTR" (shutter), "FLAG1", and FLAG2".
There is a separate maintenance procedure for replacement of the fire safety pin.
Warning. Only those qualified under radiation safety license and getting clearance
from the Honeywell Measurex Radiation Safety Department are allowed to replace
the fire safety pin.
Fuse
A pico fuse, labeled "F2", is in series with the shutter signal and a spare fuse is provided on the board.
This spare is labeled "F1 SPARE". These fuses are inserted and not soldered.
Receiver Assembly
The receiver assembly consists of a compensator, the ion chamber detector, the amplifier card with
jumper selectable gain, and an integral air curtain. The ion chamber is the same as used on the earlier
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