ME 322 LAB 7 Computer Data Acquisition System for Steady Thermocouple Signals

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ME 322 LAB 7 Computer Data Acquisition System
for Steady Thermocouple Signals

• Performed 02/13/2004

Sinan Ozcan I believe I performed 50 of this
lab Participation (__/50 points) Soma I believe
I performed 50 of this lab Participation (__/50
points)
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ABSTRACT

• The temperature of boiling and room-temperature
  water, and an ice/water bath were measured using
  a mercury-in-glass thermometer and a computer
  data acquisition system.
• Measurements from both instruments were in
  agreement for all three baths.
• The measure boiling water temperatures were in
  agreement with the predicted saturation
  temperature at the measured barometric pressure.

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Figure 1 VI Front Panel
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Figure 2 VI Block Diagram
Formula Formula Uses a calculator interface to create mathematical formulas. You can use this Express VI to perform most math functions that a basic scientific calculator can compute. -------------------- This Express VI is configured as follows Formula voltage1000
Convert from Dynamic Data Convert from Dynamic Data Converts the dynamic data type to numeric, Boolean, waveform, and array data types for use with other VIs and functions.
Formula2 Formula Uses a calculator interface to create mathematical formulas. You can use this Express VI to perform most math functions that a basic scientific calculator can compute. -------------------- This Express VI is configured as follows Formula (F-32)/1.8
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Fig. 4 Measured Temperature versus Time

• The measured temperatures are fairly constant

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Table 1 Measured and Predicted Temperatures

• This table presents the mean and standard
  deviation of the computer-acquired temperatures
  for three different baths. The readings from a
  mercury-in-glass thermometer are also included.
• The temperatures from both measurement devices
  are in agreement for all three baths
• The saturation temperature at the measured
  barometric pressure of Patm 87 kPa is 95.6oC
  (Reynolds, W.C. and Perkins, H.C., Engineering
  Thermodynamics, 2nd edition, McGraw Hill, 1977).
  This is within the uncertainty of the measured
  boiling water temperature.