The gelation point is usually characterized by a sudden, pronounced increase in material viscosity
The determination
of the gelation point for thermosetting compounds is critical in
evaluating the rate of polymerization for materials such as resins,
waxes, varnishes, styrenes, monomers, potting compounds, melamine,
formaldehydes, unsaturated oils, thermosetting foodstuffs, and other
polymerizable materials. The gelation point is usually characterized by
a sudden, pronounced increase in material viscosity (thickness).
The gelation point can help determine shelf life of a substance by
plotting the log of gel time vs.1/t (absolute temperature). Simply
determine gel times at two or more elevated temperatures and extrapolate
to ambient. The points should fall into a straight line. A Gel Time
meter provides a highly reliable means for measuring the gel time
defined as the time for the material under test to reach the incipient
gelled state at a constantly, controlled temperature.
Model 2295A Digital Temperature Controller
The Model 2295A provides the ultimate in safe, automatic, variable
temperature control. It is the ideal way to provide temperature bath
control for gel time testing. Simply set the front panel to the desired
set point (up to 315° C) and the 2259A maintains precise temperature
regulation to within ± 0.2° C after temperature stabilization.
Features
Ideal
for production, quality control and research work
Simple,
Intuitive operation
Determine
precise gelation point for thermosetting compounds
Reproducible
results within ±1%
Automatic
shut-off at Gel Point for error-free testing
Audible
and visual indication at gel point
Self-indicating
to nearest second
Fully
automatic temperature controler available (Model 2295A)
Portable
Design: Compact and lightweight
ApplicationsGel
Time Meter and Components
A
typical system used to measure the gelation point consists
of the following items:
The
test sample is placed into a test tube and immersed within a
constant temperature bath
A
rotating glass rod spindle is placed into the sample
The
glass rod is attached to a torsion wire being driven by a
synchronous motor rotating at 1 rpm
Timing
commences and the Gel time meter monitors the test until the
gel point has been reached
The Gel
Time is displayed and a beeper and indicator light provide
audible and visual indication of the gel time being reached
SPECIFICATIONS
Model 2295A
Temperature Controller
Display
4 1/2
digit LED 1/2" high
Temperature Range
32 to 1,562°
F (0 to 850° C)
Accuracy /
Resolution
± 1° C (0 to 325°
C) / 0.1° for Centigrade scale
Input Sensor Type
K Type
Thermocouple
Power
120 VAC,
50/60 Hz
CAT
NO.
MODEL
DEscRIPTION
AVAIL
PRICE
22A
22A
Gel Time
Meter, 120V/60Hz
Yes
3,013,200
22A/50
22A/50
Gel Time
Meter, 120V/50Hz
Yes
3,013,200
22A-240
22A-240
Gel Time
Meter, 240V60Hz
Yes
3,445,200
22A-240/50
22A-240/50
Gel Time
Meter, 240V/50Hz
Yes
3,445,200
2295A
WD-68900-01
Digital
Temperature Controller
Yes
1,501,200
2296
2296
Thermocouple
Type K with 5 Foot Coil Cord
Yes
270,000
22A Kit A
22A Kit A
Start up Kit
Yes
Call
031-777-1588
(12)
Test Tubes (2232-5),(12) Stirring Rods (2242-1), (12) Plastic
Sleeves,large & small 2242-2), (12) Allen Set Screws (2242-5), (1)
Allen Wrench Small, (0.035”)(2232-31)
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