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STABILITY TESTING
1. The manufacturer has performed temperature stability tests on Mini Block Heaters.
The manufacturer used calibrated temperature measuring devic for the stability
tests. Units were set-up with the Mini Modular Heating Blocks so the heater plates
were not exposed to the environment.
a. Set up the unit in a stable environment.
b. Set up the unit with the Mini Modular Heating Block and then place the proper
fitting tubes into the block. Fill the tubes with liquid, where the liquid level is
lower than the top surface of the Mini Modular Heating Block. Use a calibrated
temperature measuring device that is designed for immersion in liquids, and
place the temperature probe in the bottom of one of the tubes or vials in the
block. Set the temperature of the unit. Allow the unit to reach temperature and
stabilize for twenty (20) minutes or more and then take temperature readings
for stability. Please note the characteristics of the liquid used for the test and
the fit of the tube in the Mini Modular Heating Block can affect the results of a
stability test for the Mini Dry Block Heaters. Tubes must be the proper size for
the Modular Heating Block so there is a secure fit with no air gaps to ensure
good thermal contact.
UNIFORMITY TESTING
1. The manufacturer has performed uniformity tests on Dry Block Heaters to ensure
even heating across the entire heater plate. The manufacturer placed tubes into
all the wells in the block and used (4) thermocouples in these tubes to measure
uniformity. Five independent calibrated temperature measuring devices were
used during the test. The 5th probe was used to measure ambient temperature.
Temperature was set and the units were allowed to heat up and stabilize for twenty
(20) minutes or more. Readings were then taken at regular intervals to monitor the
temperature uniformity for four hours. These tests were repeated after rotating the
temperature measuring devices to different thermometer well positions to confirm the
temperature uniformity of the units.
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2. The recommended procedure for testing the unit's temperature uniformity is as
follows:
a. Set-up the unit in a stable environment.
b. Set-up the unit with the Mini Modular Heating Block to cover the entire heating
plate. Then set up the block with the proper fitting tubes. Place liquid samples
in tubes or vials where the liquid level is lower than the height of the top surface
of the Modular Heating Block.
c. Select multiple calibrated temperature measuring devices that are designed for
immersion in liquids. Use these temperature measuring devices at the same
time across various positions in the Mini Modular Heating Block. Place the
temperature probes in the bottom of several of the filled tubes. Ensure the liquid
levels in the tubes or vials with the temperature probes does not rise above the
height of the top surface of the Mini Modular Heating Block.
d. Set the temperature of the unit. Allow the unit to reach temperature and stabilize
for twenty (20) minutes or more and then take temperature readings from all the
temperature devices to test for temperature uniformity.
e. Please note the characteristics of the liquid used for the test and the fit of the
tube or vial in the Mini Modular Heating Block can affect the results of the
uniformity test for the Mini Block Heaters. Tubes must be the proper size for the
Mini Modular Heating Block so there is a secure fit with no air gaps to ensure
good thermal contact. Enable/Disable Function Settings
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