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4250 Design Changes Advanced
™
Osmometer 3250/Cryoscope 4250 Service Manual
Dimensions inches centimeters
Width: 13.0 33.0
Depth: 18.0 45.7
Height: 12.0 30.5
with head up: 16.0 40.6
Weight pounds kilograms
Net: 23 10
Shipping: 34 15
Warranty: One-year limited warranty on workmanship and all parts except
glass, plastic and parts warranted by their makers.
Certification:
98214
Refer to Regulatory Notices for applicable standards.
Installation Class: I
Over-Voltage Category: II
Pollution Degree: 2
Moisture Protection: IPX0 (Ordinary)
4250 Design Changes
The serial number suffix indicates the revision of the instrument. The chart below lists the
major changes made at each revision of the 4250 Cryoscope.
Model 4250 Cryoscope Description
Serial Suffix ‘A’
November 2005
Original model released.
Serial Suffix ‘B’
May 2007
Base chassis and cover redesigned.
Serial Suffix ‘C’
October 2007
Up/Down relay PC boards redesigned into a single RoHS-compliant
PC board.
Serial Suffix ‘D’
September 2009
**MAJOR REVISION**
AC head motor and supporting components replaced with a DC
stepper motor, multi-driver PC board and power supply, Seiko
thermal printer assembly with thread-through paper loading and
supporting components replaced with a Citizen thermal printer
assembly with easy-load paper loading.
Serial Suffix ‘E’
October 2010
Application board redesigned to power display and keypad
LEDs from VCC +5 VDC line. Main harness redesigned.
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