OHAUS HB1AL Manual De Instrucciones página 13

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MODULAR HEATING BLOCKS AND SAMPLES
Only Ohaus Modular Heating Blocks are to be used in the Dry Block Heaters.
1. Select the proper blocks that will be a precise fit for the tubes, plates, or vials that
you will be using for your application.
2. Only plastic or glass tubes, plates, or vials are to be used in the Modular Heating
Blocks. Metal vessels will adversely affect the temperature performance of the unit.
Metal vessels will dissipate too much heat into the air, thus adversely affecting the
temperature readings of the unit.
3 . Blocks need to be in all positions on the unit so the heating plate is not exposed to
the environment.
4. To ensure proper heating, the tubes, plates, or vials that are used must be the
correct size for the Modular Heating Block. The tubes, plates or vials must fit
securely in the hole with no air gaps and maintain as much contact as possible with the
wall of the block. This will ensure good thermal contact between the Modular Heating
Block and the tube, plate or vial you are using for your application.
5. For proper heating, the fluid level within your tube, plate or vial should not exceed
the height of the Modular Heating Block. If your application requires the fluid level
to be above the height of the block, then a temperature cover is recommended.
6. When using a temperature measuring device in a sample, the end of the probe
should be placed at the bottom of the sample and the height of the liquid should
not exceed the height of the Modular Heating Block. Ensure that your temperature
measuring device is designed for immersion in liquids.
7. Contact your Ohaus representative for information on ordering Modular Heating
Blocks and other Dry Block Heater accessories.
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OPTIONAL EXTERNAL RTD PROBE KIT (FOR DIGITAL UNITS)
1. If your application requires a high level of accuracy, the optional external RTD
probe should be used with the Dry Block Heater.
2. Follow the 'Operating Instructions' for the proper installation of the optional
external RTD probe. With the RTD probe plugged into the back of the unit, place
the thermometer portion in the thermometer well of the Modular Heating Block.
With the external RTD probe in place, the RTD probe is now driving the displayed
temperature setting for the operation of the unit, not the heating plate of the unit.
Once the optional external RTD probe is properly installed, the probe indicator LED
above the temperature display will be illuminated.
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