Heat Transfer Fluid Pump Assembly Replacement
4D3690
Fluid Filter Replacement
4D3710R
One-way Check Valve Replacement
4D3705R or 99133R
Reference: Use this instruction with replace-
ment parts 4D3690, 4D3710R,
4D3705R, or 99133R.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver.
Warning-Hazardous Voltage
Warning-Internal components may
be damaged by static electricity.
CAUTION: Improper tubing connec-
tions may result in fluid leakage and
may cause damage to the instrument.
General Information:
Advanced Instruments, Inc. Models 3D3,
4D3, 3250, and 4250, and Fiske Associates
Models Mark 2 and Mark 3 osmometers and
For additional information or technical assistance,
please contact Advanced Instruments Hot-Line
®
Service Center (U.S. 1-800-225-4034, outside
North America +US 1-781-320-9000).
4DP690 Rev3
(4D35/3255/MK05 Service Manual)
Page 1 of 7
cryoscopes use a closed-loop circulation sys-
tem for the heat transfer fluid in the cooling
system. Various design modifications to the
Pump Assembly affect the part replacement
instructions. Please turn to the appropriate
section listed in the table of contents, based
upon the part being replaced and the model
instrument that is being serviced.
Instruments shipped prior to 1996 have a
cooling assembly inlet tube with a much
smaller diameter. A tubing adapter has been
provided in the 4D3690 kit to allow easy con-
nection to this smaller tube.
Instruments shipped prior to 2004 use the
same type of one-way check valve (4D3705R)
in two places. One is located next to the
Fluid Filter on the pump intake in the Heat
Transfer Fluid bottle. The other is located at
the outlet end of the Pump Assembly attached
to the inlet of the Cooling Assembly.
Effective in 2004, the one-way check valve
Table of Contents
Replacement Part Model Page
Heat Transfer Fluid Pump Assembly (4D3690) 3D3, Mark 3, 4D3, Mark 2 2
Heat Transfer Fluid Pump Assembly (4D3690) 3250, 4250 4
Fluid Filter (4D3710R) All 5
Bottle One-way Check Valve (4D3705R) All 5
Cooling System Inlet One-way Check Valve All 6
(99133R)
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