Advanced Instruments 3900, Service Manual

Page: 126 / 184

3LP700 Rev6
(4D35/3255/3905 Service Manual)
Page 2 of 2
If vertical adjustment is necessary:
a. Loosen the probe setscrew and then
raise or lower the probe within its
mandrel, as necessary.
b. When the bottom of the probe is
exactly even with LEVEL B, gently
retighten the probe setscrew (over-
tightening will crack or distort the thin
plastic wall of the mandrel).
c. Recheck the probe position.
4. Align the stir/freeze wire, as necessary
(see below):
The following instructions refer to the
3250, 3900 or 3D3 osmometer:
The bottom of the stir/freeze wire should
be level with the alignment tool STEP.
a. Remove the head cover.
b. Loosen the stir/freeze wire setscrew(s)
and reset the stir/freeze wire.
c. Firmly retighten the stir/freeze wire
setscrew(s). As necessary, bend the
wire so that its tip is directly over the
STEP.
d. Replace the head cover.
The following instructions refer to the
4250 or 4D3 cryoscope:
The bottom of the stir/freeze wire should
be even with alignment tool LEVEL A.
a. Remove the head cover.
b. Loosen the stir/freeze wire setscrew(s)
and reset the stir/freeze wire.
c. Retighten the stir/freeze wire
setscrew(s). As necessary, bend the
wire so that the surface nearest the
probe is next to the vertical edge, as
shown.
d. Replace the head cover.
5. Remove the alignment tool.
6. After making any probe and/or stir/freeze
wire adjustments, check the instrument
calibration and re-calibrate as necessary.
The stir/freeze wire should be 1/32 to
1/16” (1 to 1.5 mm) away from the mandrel
at this point.
Stir Wire
Mandrel
Probe