110-509 PSC/EN
37
Reservoir Fluids
Depending on your needs, a variety of fluids can be used with your Circulator. No matter what bath fluid is
selected, it must be chemically compatible with the reservoir and the materials in your Circulator. It must
also be suitable for the desired temperature range.
WARNING
: Do not use a flammable liquid as a bath fluid as a fire hazard may result.
WARNING:
Always use fluids that satisfy safety, health, and equipment compatibility requirements.
For optimum temperature stability, the fluid’s viscosity should be 50 centistokes (cSt) or less at its lowest
operating temperature. This permits good fluid circulation and minimizes heating from the pump.
For temperatures from 10°C to 90°C, distilled water is recommended. For temperatures below 10°C, a
mixture of laboratory grade ethylene glycol and water should be used. Do not use deionized water.
The following chart is intended to serve as a guide in selecting a bath fluid for your application. For
optimum temperature stability and low vaporization, be sure to stay within the fluid's normal temperature
range.
You are responsible for proper selection and use of the fluids. Avoid extreme range operation
.
Fluid Description
Viscosity
(cSt)
@ 25°C
Specific Heat
Normal
Temperature
Range
Extreme
Temperature
Range
@ Fluid
Temperature
BTU/lb°F
KJ/Kg°C
distilled water
1
50°C
1.00
4.18
10° to 90°C
2° to 100°C
polyclear MIX 30
1
50°C
1.00
4.18
15° to 90°C
2° to 100°C
polytherm S150
50
100°C
0.41
1.71
50° to 150°C
5° to 270°C*
polytherm S200
125
150°C
0.40
1.67
100° to 200°C
80° to 232°C*
polytherm S250
500
200°C
0.39
1.63
150° to 250°C
125° to 260°C*
polytherm M170
40
85°C
0.40
1.67
50° to 170°C
25° to 190°C
polycool HC -50
3
-30°C
0.62
2.59
-50° to 100°C
-62° to 118°C
polycool EG -25
(50/50 mix with distilled H
2
O)
20
-20°C
0.78
3.26
-25° to 100°C
-30° to 115°C
polycool EG -25
(30/70 mix with distilled H
2
O)
12
0°C
0.89
3.72
0° to 95°C
-15° to 107°C
polycool PG -20
(50/50 mix with distilled H
2
O)
20
-10°C
0.83
3.47
-20° to 100°C
-30° to 115°C
polycool PG -20
(30/70 mix with distilled H
2
O)
12
5°C
0.92
3.85
5° to 90°C
-10° to 107°C
polycool MIX -25
(50/50 mix with distilled H
2
O)
20
-20°C
0.78
3.26
-25° to 100°C
-30° to 115°C
polycool MIX -25
(30/70 mix with distilled H
2
O)
12
0°C
0.89
3.72
0° to 95°C
-15° to 107°C
*WARNING:
This is the fluid’s flash point temperature.
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