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Lab%208%20-%20Pressure%20and%20Load

Lab%208%20-%20Pressure%20and%20Load - LAB 8 PRESSURE AND...

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LAB 8: PRESSURE AND LOAD MEASUREMENT Sensitivity Both pressure transducers and load cells, among many other types of instrumentation, are described using “sensitivity.” This sensitivity is typically given in units of mV/V/FS. FS refers to the full scale of the instrument, or total range. The calibration factors for these types of equipment can be found by multiplying (Sensitivity) x (Excitation Voltage) / (FS Range). Pressure Transducers The most common type of pressure transducer is based upon the strain gage. A small diaphragm inside the pressure transducer flexes with an increase in pressure and a strain gage measures the increase in strain of the diaphragm. This strain is then converted into an output voltage. The voltage output typically increases linearly with pressure increase. Load Cells Load cells, like pressure transducers, are also based on the strain gage. Internal strain is measured as load and is applied and converted into a voltage. The voltage output typically increases linearly with pressure increase. There are many, many different types of load cells in all different shapes and sizes.
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PRE-LAB 8 You are given the following: Model A Model B Model C Model D Pressure Range (psig) 0–20 0–50 0–100 0–200 Sensitivity (mV/V/FS) 10 10 10 10 Excitation Voltage (V) 5 5 5 5 1)
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