28176 Parallax Inc, 28176 Datasheet - Page 195
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
Specifications of 28176
Accessory Type
Process Control
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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temperature difference between the sensor and air are just two examples of energy
transfer.
Just as the RC network required 5 time constants (5 τ) to fully discharge, the LM34
requires 5 τ to fully cool. Based on the curve, what is the value of 1 τ for this device?
Approximately 200 seconds/5 = 40 seconds.
The LM34 has a very large mass that must be heated and cooled when responding to
temperature changes.
resistance based on temperature, may have very small mass in order to quickly respond to
temperature changes.
Challenge 6-1: Testing Another Temperature
Part A:
Was there a significant change in the time constants using the two temperatures? Why or
why not?
Part B:
√
√
√
√
√
1. Explain the graph of the warming based on your understanding of energy
2. Determine the value of 5 τ and 1 τ for warming to room temperature.
Heat the sensor to approximately ½ the temperature in Activity #1.
Allow the sensor to return to room temperature.
Determine the value of 5 τ and 1 τ.
Being careful not to get the electronics wet, cool the system to 50° F using ice or
a cold can.
Monitor the graph of cooling and returning to room temperature.
transfer rates.
Other temperature sensors, such as thermistors that change
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