EISCO PH0453A 250mL Double Wall Electric Calorimeter

1. Introduction

The EISCO PH0453A Double Wall Electric Calorimeter is designed for precise calorimetry experiments in educational and laboratory settings. This apparatus allows for the measurement of heat changes during various processes, utilizing an electric heating coil to introduce a known amount of energy. Its double-wall construction minimizes heat loss to the surroundings, ensuring more accurate results.

2. Components

The calorimeter kit includes the following components:

• 250mL Aluminum Inner Vessel: The primary container for the substance undergoing calorimetry.
• 900mL Outer Vessel: Provides insulation for the inner vessel, reducing heat exchange with the environment.
• Transparent Cover: Features two terminals for electrical connections and two holes for a thermometer and stirrer.
• 5 Watt Heating Coil: Integrated into the cover terminals, used to introduce a controlled amount of heat.
• Stirrer: Used to ensure uniform temperature distribution within the inner vessel.

Note: A 6V 1A power supply and a thermometer are required for operation but are not included with this kit.

Figure 2.1: View of the calorimeter components, including the inner and outer vessels, transparent lid with terminals, and heating coil.

3. Setup Instructions

1. Assemble Vessels: Carefully place the 250mL aluminum inner vessel inside the 900mL outer vessel. Ensure it is centered and stable.
2. Position Cover: Place the transparent cover onto the outer vessel. The cover should fit securely, with the heating coil terminals extending downwards into the inner vessel.
3. Insert Stirrer: Insert the provided stirrer through one of the designated holes in the transparent cover. Ensure it can move freely to stir the contents of the inner vessel.
4. Insert Thermometer: Insert a suitable thermometer (not included) through the second hole in the transparent cover. Position the thermometer bulb to be immersed in the substance within the inner vessel without touching the bottom or sides.
5. Connect Power Supply: Connect the terminals of the 5-watt heating coil to a 6V 1A DC power supply (not included) using appropriate electrical leads. Ensure connections are secure before applying power.

Figure 3.1: Assembled calorimeter with stirrer being inserted into the transparent lid.

4. Operating Instructions

Follow these steps for a typical calorimetry experiment:

1. Prepare Sample: Place the substance (e.g., water) into the 250mL inner aluminum vessel. Ensure the volume is appropriate for your experiment and allows for proper immersion of the thermometer and stirrer.
2. Initial Temperature Reading: Allow the system to equilibrate for a few minutes. Record the initial temperature (T_initial) of the substance using the thermometer.
3. Apply Heat: Turn on the 6V 1A power supply to activate the 5-watt heating coil. Simultaneously, start a timer.
4. Stir Continuously: Gently and continuously stir the contents of the inner vessel using the stirrer throughout the heating period to ensure uniform heat distribution.
5. Monitor Temperature: Observe the temperature rise. After a predetermined time interval (e.g., 5-10 minutes) or when a desired temperature is reached, turn off the power supply and stop the timer.
6. Final Temperature Reading: Continue stirring for a short period (e.g., 30 seconds) to ensure the heat is fully distributed, then record the final maximum temperature (T_final).
7. Calculations: Use the recorded temperature change, mass of the substance, and specific heat capacity to calculate the heat absorbed. The energy supplied by the heating coil can be calculated using the power (5W) and the duration of heating.

5. Maintenance

Proper maintenance ensures the longevity and accuracy of your calorimeter.

• Cleaning: After each use, disassemble the calorimeter and wipe all components clean with a soft, damp cloth. Ensure all parts are thoroughly dried before storage to prevent corrosion, especially the aluminum vessels. The product is designed for easy cleaning.
• Storage: Store the calorimeter in a clean, dry place away from direct sunlight and extreme temperatures.
• Heating Coil Replacement: The 5-watt heating coil is designed to be easily replaceable. If the heating coil ceases to function, disconnect the power supply, carefully remove the transparent cover, and replace the coil by unscrewing the terminals. Ensure the replacement coil is compatible (5W, 6V).
• Inspection: Periodically inspect the electrical connections and the integrity of the vessels and cover for any signs of damage or wear.

6. Troubleshooting

If you encounter issues with your calorimeter, consider the following:

• No Heat from Coil:
  • Check if the 6V 1A power supply is correctly connected and functioning.
  • Verify that the electrical leads are securely attached to the heating coil terminals.
  • Inspect the heating coil for visible damage; it may need replacement.
• Inconsistent Temperature Readings:
  • Ensure continuous and thorough stirring of the substance during the experiment.
  • Verify that the thermometer is properly calibrated and its bulb is fully immersed without touching the vessel walls.
  • Check for drafts or significant temperature fluctuations in the experimental environment.
• Excessive Heat Loss:
  • Ensure the transparent cover is securely placed on the outer vessel.
  • Minimize the time the cover is removed during the experiment.
  • Confirm the double-wall construction is intact and free from damage.

7. Specifications

8. Safety Information

Always prioritize safety when conducting experiments with the calorimeter.

• Electrical Safety: Ensure the 6V 1A power supply is appropriate and in good working condition. Avoid contact with electrical terminals when power is applied. Disconnect power before making or breaking connections or performing maintenance.
• Hot Surfaces: The heating coil and inner vessel will become hot during operation. Allow components to cool before handling. Use appropriate heat-resistant gloves if immediate handling is necessary.
• Chemical Handling: If using chemicals, follow all standard laboratory safety procedures, including wearing appropriate personal protective equipment (PPE) such as safety goggles and gloves.
• Supervision: This apparatus is intended for educational and laboratory use. Always operate under the supervision of a qualified instructor or professional.
• Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Handle with care and follow all safety guidelines.

9. Warranty and Support

Specific warranty details are not provided in this manual. For information regarding warranty coverage, technical support, or replacement parts, please contact EISCO customer service or refer to the product packaging and official EISCO website.

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