Ratek TH8000/TH8200 Precision Immersion Heater Circulator - User Manual
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Page 21 of 25
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Connect power to the Immersion Heater Circulator and set the Mains Power Switch to the position indicated with
a vertical line.
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Ensure the temperature set-point is set to 100°C, this ensures the heating element will remain on during the test.
Refer to the section of this User Manual labeled “Operating a Single Static Temperature”.
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Using a long thin-shafted screwdriver or other suitable instrument with an insulated handle, raise the low level
float bulb to it’s uppermost position by inserting the screwdriver through a hole in the guard panel. Be sure to use
a tool long enough to ensure your hands are kept away from the heating element and any resulting steam to avoid
burns. This will override the low-level cut-out and ensure the element will remain on to test the over-temperature
safety cutout.
Use a long thin screwdriver to lift the low level float bulb
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The Immersion Heater Circulator will begin heating and the Heating Element Indicator will light up.
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The water in the water bath will gradually boil away until the over-temperature safety cutout is exposed, this may
take some minutes.
Do not leave the Immersion Heater Circulator unattended during the test.
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Once the top coil of the heating element has become exposed, the over-temperature cutout should have activated.
When the cutout activates, a small click sound may be heard and the over-temperature reset button will pop out. If
the over-temperature cutout has failed to operate or any part of the heating element has begun to glow, the test
has failed and the Immersion Heater Circulator should be turned off immediately to prevent damage to the
Immersion Heater Circulator.
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Remove the screwdriver and allow the low level float bulb to drop back down.
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Depending on the quality of the water being used, an unpleasant smell may also be noticed as a result of the
impurities in the water becoming hot. This is normal.
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Once the test has been completed, turn off power to the Immersion Heater Circulator immediately by setting the
Mains Power Switch to the position marked with a circle.
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If the over-temperature cutout has failed to operate, contact Ratek using the contact details provided in the
section of this User Manual titled “Ratek Service Contact Information”.
CAUTION
NEVER
operate the Immersion Heater Circulator if the over-temperature safety cutout test has failed. Operating the
Immersion Heater Circulator without a functional over-temperature safety cutout may result in serious injury, threat
to life, fire or damage to property.
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Turn off the mains power supply at the outlet.
