28176 Parallax Inc, 28176 Datasheet - Page 195

• Manufacturer Part Number: 28176
• Description: KIT PARTS PROCESS CONTROL W/TEXT
• Manufacturer: Parallax Inc

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

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