Home > Science Equip > Science Equip CH1920-001 Magnetic Stirrer Hot Plate Thermostat Instructions
Science Equip CH1920-001 Magnetic Stirrer Hot Plate Thermostat Instructions
Instruction Sheet
Why Am I Having Trouble Boiling Water On A Hot Plate ?
IEC Hot Plates have with either ‘Simmerstat’ or ‘Thermostat’ temperature control. It is sometimes
confusing as to which style should be chosen. This sheet is to try to explain the difference and to
make the choice more correct.
Information on Simmerstat’ and Thermostat Models:
A ‘Thermostat’ control cycles the heating element to hold a specific temperature up to 320oC and
only enough heat is fed to the plate to maintain this set temperature. This type of plate control is
excellent for lower temperature work or for melting solids at specific temperatures. It is not ideal
for boiling water or other applications where maximum heating effort and highest plate
temperature is required.
A ‘Simmerstat’ control (or energy regulator) adjusts the heat from zero to maximum on a scale of
0 to 10. When set to ‘5’, the heater is on for 50% of the time and off for 50% of the time. When
set to ‘10’, the heater is on 100% of the time and it reaches its maximum temperature of around
o
420 C.
This temperature is much higher than can be obtained with the Thermostat control and, for
bringing water to the boil in a vessel (beaker or similar), the plate needs to achieve the highest
temperature, as explained below.
Explanation:
When a beaker of liquid is heated on a hot plate, several things should be considered:
1) Most of the available heating energy is lost from the plate area that is not covered by the
beaker.
2) The beaker normally has a small air space that is captive between the hot plate and the
glass of the beaker and heat must pass through this insulating pocket.
3) As water is approaching a boil, steam is produced which cools the surface of the water.
This loss of heat must be made up by further heat from the plate.
4) As water approaches a boil, there is considerable heat loss also from the walls of the
beaker to the surrounding atmosphere.
In summary, the ‘Simmerstat’ control permits the maximum power of the hot plate to be used and
provides a higher plate temperature. It is the better choice for general laboratory applications and
particularly for bringing fluids to a simmer or a boil.
Note for Electrical Safety Testers:
The Hot Plate has a 600W tubular heating element. It is necessary that the insulation resistance
to earth exceeds 10,000 ohms. Ref: AS/NZS 3000:2000 Para 1.11.2.3.
Insulation resistance is NOT required to exceed 1 Megohm.
Designed and manufactured in Australia
4
| General | Details |
|---|---|
| Name | Science Equip CH1920-001 Magnetic Stirrer Hot Plate Thermostat Instructions |
| Make | Science Equip |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.06 MB |
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