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Questions and Answers
What would be the mA signal if the pressure reading is 687 lbs on a transmitter scaled between 500 and 1000 lbs?
What would be the mA signal if the pressure reading is 687 lbs on a transmitter scaled between 500 and 1000 lbs?
What pressure reading corresponds to a 14 mA signal on a transmitter scaled between 500 and 1000 lbs?
What pressure reading corresponds to a 14 mA signal on a transmitter scaled between 500 and 1000 lbs?
What would be the mA signal for a temperature reading of 425 degrees Fahrenheit on a temperature transmitter scaled from 200 to 800 degrees Fahrenheit?
What would be the mA signal for a temperature reading of 425 degrees Fahrenheit on a temperature transmitter scaled from 200 to 800 degrees Fahrenheit?
If a temperature transmitter sends a 14 mA signal to a temperature controller, what would the temperature reading be?
If a temperature transmitter sends a 14 mA signal to a temperature controller, what would the temperature reading be?
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What would be the level percentage in a vessel if a level transmitter sends a signal of 7 mA to the level controller with a range of 0 to 100%?
What would be the level percentage in a vessel if a level transmitter sends a signal of 7 mA to the level controller with a range of 0 to 100%?
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What level percentage corresponds to an 8 psi signal sent to a pneumatic level controller with a range of 0 to 100%?
What level percentage corresponds to an 8 psi signal sent to a pneumatic level controller with a range of 0 to 100%?
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If a level is indicating 83%, what would the psi signal reading be?
If a level is indicating 83%, what would the psi signal reading be?
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If a delta p flow transmitter is signaling 'zero', what does that imply about the flow rate?
If a delta p flow transmitter is signaling 'zero', what does that imply about the flow rate?
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What is the flow rate at a delta p flow transmitter scaled to read (0 to 50 gpm) when the maximum delta p is 100 inches of water and a pressure of 15 psi is applied?
What is the flow rate at a delta p flow transmitter scaled to read (0 to 50 gpm) when the maximum delta p is 100 inches of water and a pressure of 15 psi is applied?
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Study Notes
Pressure Transmitters
- Standard electronic pressure transmitters are typically scaled to a set range; example range: 500 to 1000 lbs.
- For a pressure reading of 687 lbs, the equivalent “mA” signal is calculated to be 10 mA.
- If the signal reads 14 mA, the corresponding pressure would be 812.5 lbs.
Temperature Transmitters
- Standard electronic temperature transmitters can be scaled, e.g., between 200 and 800 degrees Fahrenheit.
- A temperature reading of 425 degrees Fahrenheit corresponds to a 10 mA signal.
- For a 14 mA signal sent to a temperature controller, the indicated temperature would be 575 degrees Fahrenheit.
Level Measurement
- Level transmitters that range from 0 to 100% can give signals indicative of percentage fill.
- A 7 mA signal from a level transmitter translates to a vessel level of 18.75%.
- Pneumatic level transmitters also operate within a 0 to 100% range; an 8 psi signal corresponds to a level of 41.67%.
Pneumatic Signals
- For a level indicating 83%, the psi signal reading will be 13 psi.
- A delta P flow transmitter signaling "zero" flow indicates that the transmitter may be broken, rather than actual zero flow or maximum flow conditions.
Flow Measurement
- For a flow transmitter scaled from 0 to 50 gallons per minute (gpm) and a maximum delta P of 100 inches of water, a reading of 15 psi yields a flow rate of 5 gpm.
I/P Transducers
- In a standard I/P transducer, a 12 mA input signal corresponds to an output of 9 psig.
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Description
Test your understanding of electronic pressure and temperature transmitters with this quiz. Explore how mA signals correspond to specific readings in pressure and temperature scenarios. Perfect for students and professionals in instrumentation and control systems.
