Users' Guide User guide

108 Calorimetry

GLX Set-Up

1. Connect the temperature probes.

a) Connect the probe in Cup 1 to one of the temperature ports on the left

side of the GLX.

b) Connect the probe in Cup 2 to the other temperature port.

c) If there are other sensors connected to the GLX, remove them.

2. Set up the Graph to display both temperatures versus time.

a) Press to return to the Home Screen; press to open the Graph.

b) The Graph will automatically be set up for the first temperature probe.

Press to open the Graphs menu, press to select Two Measure-

ments mode. The second temperature probe will be added to the Graph.

Data Collection

1. Press to start data collection.

2. Remove the masses from the hot water. Lower one mass into Cup 1; lower

two masses into Cup 2.

3. Gently stir the water in both cups.

4. Press to automatically scale the Graph.

5. After both temperature measurements have stabilized, press to stop data

collection.

Analysis

1. Use the Delta Tool to find the temperature change in Cup 1.

a) Press to open the Tools menu; press to turn on the Delta

Tool.

b) Press the up arrow to move one of the cursors to the first data point.

c) Hold and press to swap control to the other cursor; press the

down arrow key to move that cursor to the last data point.

The Delta Tool should now show the changes in temperature and time

from the first to the last data point.

Cup 1 temperature change = _____________________

Optional: after connecting the probes,

perform the alignment calibration

described on page 77.

Graph in Two Measurements mode

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