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Selecting a bath liquid
The "Ideal" Bath Liquid
Temperature Ranges
CAUTION
CAUTION
CAUTION
Revision 1.1b—November, 1998; CANNON
The "ideal" bath liquid would have a low viscosity, high heat capacity,
and low vapor pressure over a wide range of temperatures. This liquid
would also have a very high flash point and be relatively inexpensive. If
the liquid were to be used in kinematic viscosity measurements where
visual observation is important, it would be clear and colorless.
Unfortunately, there is no one "ideal" liquid to use when a wide tempera-
ture range is needed. No single liquid meets all of the above require-
ments.
The kind of liquid used in the TE-1500 Temperature Bath depends upon
the desired temperature range of the instrument. The table below lists
several different operating ranges and the liquids suitable for use in those
ranges:
T
E
1 -
5
0
T
E
M
P
E
R
A
T
U
R
R
A
N
G
E
-
0 3
C °
o t
+
0 1
C °
-
0 1
C °
o t
+
0 1
C °
+
5
C °
o t
+
0 1
C °
Methyl alcohol (methanol) is very close to the "ideal" liquid; it can be
used at all temperatures in the TE-1500 operating range. However,
methanol may not be suitable for some laboratories because of its low
flash point and degree of toxicity.
Isopropyl alcohol is less toxic than methyl alcohol and somewhat less
volatile. However, it becomes very viscous at low temperatures, making
it difficult to maintain good temperature control.
Silicone fluids CANNOT be used in the TE-1500 Constant Temperature
Bath. NEVER place a silicone liquid in the TE-1500.
Do not attempt to use water as a bath fluid for operation at temperatures
of 2°C or lower.
®
TE-1500 Thermoelectric Constant Temperature Bath
CANNON
2139 High Tech Road • State College, PA 16803 • USA
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Instrument Company
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11
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