Ratek SWB10D240 User Manual Download Page 19

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Ratek SWB10D Water Bath - Operating Manual

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Page 19 of 24

Ove

Overrrr----Temperature Safety Cutout Test

Temperature Safety Cutout Test

The over-temperature safety cutout should be tested periodically to ensure correct operation. This test
should be conducted once every 2 years of normal operation.

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Turn off both mains power switches (elements 6 and 8 in Figure 1).

Unplug the equipment from the mains power supply outlet.

Empty the water bath by referring to the section in this User Manual labeled “Emptying The Water
Tank”.

Fill the water tank with 300mL (approximately 1.5 cups) of cold water by referring to the section in this
User Manual labeled “Filling The Water Tank”, ensuring water is covering the element plate in the
bottom of the water tank.

CAUTION

CAUTION
NEVER touch the water tank or heating element whilst conducting the Over-Temperature Safety Cutout
Test as serious burns and scalding could result.

The test involves water reaching boiling temperature and the resulting steam present could cause serious
burns or scalding.

ALWAYS wear eye protection during the Over-Temperature Safety Cutout Test.
ALWAYS maintain a safe working distance from the water bath during the Over-Temperature Safety
Cutout Test.

Connect power to the water bath as per the section of this User Manual labeled “Connecting Power”.

Switch on the heating system as per the section of this User Manual labeled “Switching On The Water
Heating”. There is no need to switch on the oscillating cradle for the test.

Ensure the temperature set-point is set higher than the temperature of the water used to fill the tank,
this ensures the heating element will remain on during the test. Refer to the section of this User Manual
labeled “Setting the Required Water Temperature”.

The water bath will begin heating the water and the Heating Element Indicator (element 7 in Figure 1)
will light up.

Prepare 600mL of cold water ready to fill the water tank on completion of the test.

The water in the water tank will gradually boil away until the heating element plate is dry, this may take
some minutes. Do not leave the water bath unattended during the tes

Do not leave the water bath unattended during the tes

Do not leave the water bath unattended during the test.

After a period of less than 60 seconds following the surface of the heating element being completely
dry, the over-temperature cutout should activate. When the cutout activates, a small click sound may be
heard and the Heating Element Indicator (element 7 in Figure 1) light will go out. If the over-temperature
cutout has failed to operate within 60 seconds of the heating element being completely dry, the test has
failed and the water bath should be turned off immediately to prevent damage to the water bath.

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.

Once the test has been completed (either the cutout activated or 60 seconds has passed following the
element being completely dry and the cutout has not activated), turn off all power to the water bath
immediately by setting both mains power switches (elements 6 and 8 in Figure 1) to the up position
marked with a circle and refill the water tank with 600mL of cold water to cool the element by referring
to the section in this User Manual labeled “Filling The Water Tank”. This will help to maintain the
working life of the over-temperature safety device.

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”.