9
METHOD 1: 45UV5 SCANNERS WITH ENGINEERING CODE 00-03 (built through mid- 2008)
Sensitivity is adjusted by changing the position of the p/n 4-320-1 UV tube in its socket (Figure 10).
FIGURE 10.
45UV5 -ENGINEERING CODE 00-03 UV TUBE POSITION
Note: To change UV Tube position, pull tube out of eight pin (octal) socket, rotate to desired position, and then insert.
The tube has four different positions. When the electrodes are almost perpendicular to the Terminal
Board and approximately parallel to the shutter slot, the detector tube will generate maximum signal.
This is the “MAX" position shown in Figure 10. When the electrodes are 90
from the "MAX" posi-
tion, minimum signal will be generated. The intermediate positions, “A and B” will yield intermedi-
ate signals. Position “A” will yield a slightly higher signal than position “B” since more electrode
will be exposed to the radiation entering the shutter slot. To adjust the signal further, use the appro-
priate sensitivity adjustment in the 25SU3 or 25SU5 control. Refer to the control bulletin for further
information.
The detector is shipped in the "MAX" signal position
.
If the tube position is changed in the field, and the scanner is later replaced, verify that the signal
strength is not excessive.
METHOD 2: 45UV5 SCANNERS WITH ENGINEERING CODE 04 AND HIGHER (built after mid-2008)
The sensitivity is adjusted by changing the position of the orifice plate in front of the p/n 4-290-2 or
4-314-1 UV tube. See Figure 11.
FIGURE 11.
45UV5 -ENGINEERING CODE 04 or HIGHER ORIFICE PLATE POSITION
Sensitivity adjustment - loosen but do not remove the two adjustment plate retaining nuts. Pull orifice plate back
toward retaining nuts to detach from locating pins. Slide the orifice plate up toward the shutter coil for more sensitivity
or down from the shutter coil for less sensitivity. Position the plate onto locating pins to lock in place. Tighten the
adjustment plate retaining nuts.
SCANNER WITH COVER REMOVED TO
REPLACE TUBE OR CHANGE SLOT
POSITION OF 4-320-1 TUBE
( )
( )
( )
( )
A
A
ELECTRODES
TERMINAL BOARD
UV TUBE
SHUTTER
SLOT
RECTANGULAR
MAX
MAX
B
B
Sensitivity adjustment
plate with orifices
Adjustment plate
retaining nuts (2)
UV tube
retaining
clip
UV tube,
4-290-2 or
4-314-1
