Pressure transmitters are important in many industries. They measure pressure in systems. If they give wrong readings, it can cause problems. This article will talk about common calibration errors. It will also give simple solutions.
What is Calibration?
Calibration is checking if a device gives correct readings. It compares the device reading to a known standard. If they match, the device is good. If not, it needs adjustment.
Why is Calibration Important?
Correct calibration ensures accurate readings. This is vital for safety and efficiency. Incorrect readings can lead to system failures. They can also cause safety hazards.

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Common Calibration Errors
Let’s look at some common calibration errors. We will also discuss how to fix them.
1. Zero Error
This happens when the transmitter does not show zero at no pressure. It may show a positive or negative value.
Solution
Adjust the zero setting. Follow the manual to do this. Check if it shows zero with no pressure.
2. Span Error
Span error occurs when the transmitter does not cover the full range. For example, it should measure 0-100 PSI but only measures 0-90 PSI.
Solution
Adjust the span setting. Follow the manual to do this. Make sure it covers the full range.
3. Linearity Error
Linearity error means the output is not a straight line. It may curve up or down at different points.
Solution
Use a calibration tool to check the linearity. Adjust the transmitter settings. Make sure the output is a straight line.
4. Hysteresis Error
Hysteresis error happens when the transmitter shows different readings. This occurs when pressure increases and decreases.
Solution
Check the transmitter for wear and tear. Replace if needed. Calibrate the transmitter again.
5. Temperature Error
Temperature changes can affect the transmitter. It may give wrong readings at different temperatures.
Solution
Use transmitters with temperature compensation. Calibrate the transmitter at different temperatures. Check if the readings are accurate.
6. Mechanical Damage
Mechanical damage can cause errors. This includes dents, scratches, or broken parts.
Solution
Inspect the transmitter regularly. Check for any signs of damage. Repair or replace damaged parts. Calibrate the transmitter after repairs.
7. Electrical Interference
Electrical interference can cause wrong readings. This includes nearby electrical equipment or power lines.
Solution
Keep transmitters away from strong electrical sources. Use shielded cables. Calibrate the transmitter in a low-interference environment.
8. Improper Installation
Improper installation can lead to errors. This includes incorrect mounting or wrong connections.
Solution
Follow the installation guide carefully. Check all connections. Ensure the transmitter is mounted correctly. Calibrate the transmitter after installation.
9. Dirty Or Blocked Ports
Dirt or blockages can affect the transmitter. This can cause wrong readings.
Solution
Clean the transmitter ports regularly. Check for blockages. Ensure the ports are clear before calibration.
Steps for Proper Calibration
Here are some steps to follow for proper calibration:
- Check the manual for calibration instructions.
- Use a known standard for comparison.
- Adjust the zero and span settings.
- Check for linearity and hysteresis errors.
- Calibrate at different temperatures if needed.
- Inspect for mechanical damage and electrical interference.
- Ensure proper installation and clean ports.
Frequently Asked Questions
What Causes Pressure Transmitter Calibration Errors?
Incorrect installation or environmental factors often cause calibration errors in pressure transmitters.
How Often Should Pressure Transmitters Be Calibrated?
Pressure transmitters should be calibrated every six to twelve months for optimal performance.
What Is Zero Shift Error In Pressure Transmitters?
Zero shift error occurs when the transmitter’s baseline reading drifts from zero.
How Can Temperature Affect Pressure Transmitter Accuracy?
Extreme temperatures can cause drift and inaccuracies in pressure transmitter readings.
Conclusion
Calibration is key for accurate pressure transmitter readings. Common errors include zero, span, and linearity errors. Hysteresis, temperature, and mechanical damage also cause issues. Electrical interference, improper installation, and dirty ports are also problems. Follow the solutions to fix these errors. Ensure proper calibration steps for best results. Accurate readings ensure safety and efficiency in systems. Regular calibration and maintenance are vital. Always follow the manual and use the right tools.

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Summary Table
Error Type | Solution |
---|---|
Zero Error | Adjust zero setting |
Span Error | Adjust span setting |
Linearity Error | Check and adjust linearity |
Hysteresis Error | Check for wear, replace if needed |
Temperature Error | Use temperature compensation, calibrate at different temperatures |
Mechanical Damage | Inspect, repair or replace parts |
Electrical Interference | Keep away from electrical sources, use shielded cables |
Improper Installation | Follow installation guide, check connections |
Dirty or Blocked Ports | Clean and check ports |