The following differential pressure sensor uses a matched pair of strain gauges. As the differential pressure increases, one strain gauge becomes compressed while the other becomes stretched. A voltmeter registers the bridge circuit’s imbalance and displays it as a pressure measurement:
Differential Pressure Sensor
Determine the following:
- Identify which port is the “high” pressure port
- Identify what the voltmeter will register if fixed resistor R1 fails open
- Identify a component fault that would drive the voltmeter full upscale (“peg” positive)
- Identify another component fault that would drive the voltmeter full upscale (“peg” positive)
Answer:
Which port is the “high” pressure port: Port “B”
What will happen if fixed resistor R1 fails open: Voltmeter will drive fully upscale (“peg” positive)
Identify a component fault that would drive the voltmeter full upscale (“peg” positive): as follows below
- Strain gauge #1 fails shorted
- Strain gauge #2 fails open
- R1 fails open
- R2 fails shorted
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Credits: Tony Kuphaldt
