Differential Pressure Transmitter (DPT) Calibration

In summary, the conversation discusses the process of calibrating a standard 4-20mA Differential Pressure Transmitter (DPT) to measure differential pressure in the range 5 to 20 psi. The recommended method involves using a calibrated pressure pump and setting the upper and lower range values using a HART communicator. The conversation also suggests referring to a blog for more information on the calibration procedure.
  • #1
JohnielWhite
47
0
I understand the basic principle behind pressure sensor calibration but i am still not able to do a calibration problem. Could someone Explain how you would go about calibrating a standard 4-20mA Differential Pressure Transmitter (DPT) to measure differential pressure in the range 5 to 20 psi?
Or direct me to literature that may be helpful in solving this problem. Thanks in Advance.
 
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  • #2
A calibrated pressure pump is often used. With the calibrated pressure pump, you would "teach" the instrument that 5 psid is 4 mA and 20 psid is 20 mA.
 
  • #3
thanks for replying...
 
  • #4
if you are using a smart transmitter you can use a hart communicator ..set URV and LRV according to your requirement..

pls refer the following link for more information..
http://instrumentpedia.blogspot.in/2012/04/calibration-procedure-differential.html
 
  • #5


I can understand your struggle with calibrating a Differential Pressure Transmitter (DPT). Calibrating a DPT is a crucial step in ensuring accurate and reliable measurements. I can provide some guidance on how to approach this problem.

Firstly, it is important to understand the basic principle behind pressure sensor calibration. Pressure sensors, including DPTs, work by converting physical pressure into an electrical signal. The electrical signal is then interpreted by the device to provide a pressure reading. Calibration is the process of adjusting the device to accurately measure a known pressure value.

In order to calibrate a standard 4-20mA DPT, you will need a calibration kit that includes a pressure source, pressure gauge, and a multimeter. The pressure source should be able to generate pressures within the range of 5 to 20 psi. The pressure gauge will be used to verify the actual pressure being applied, and the multimeter will be used to measure the output signal from the DPT.

The calibration process involves applying different known pressure values to the DPT and adjusting the device to match the output signal with the corresponding pressure value. This can be done by adjusting the zero and span settings on the DPT. The zero setting adjusts the output signal at zero pressure, while the span setting adjusts the output signal at the maximum pressure. It is important to note that these adjustments should be made slowly and carefully to avoid any errors.

To start the calibration process, connect the pressure source to the DPT and apply a pressure of 5 psi. Use the multimeter to measure the output signal and adjust the zero setting until the output signal matches the applied pressure. Next, increase the pressure to 20 psi and adjust the span setting until the output signal matches the new pressure value. Repeat this process for a few more pressure points within the range to ensure accuracy.

It is also important to check the hysteresis and linearity of the DPT during calibration. Hysteresis refers to the difference in output signal when the pressure is applied and removed at the same point. Linearity refers to the deviation of the output signal from a straight line when different pressure values are applied. These can be checked by applying different pressure values and comparing the output signal to the expected values.

I would also recommend referring to the manufacturer's manual for specific instructions on calibrating your DPT model. Additionally, there are many online resources and literature available that can provide more detailed guidance on D
 

1. What is a Differential Pressure Transmitter (DPT)?

A Differential Pressure Transmitter (DPT) is a device used to measure the difference in pressure between two points. It consists of a sensor that detects the pressure difference and converts it into an electrical signal, which can then be transmitted and displayed on a control panel or computer.

2. Why is calibration important for DPTs?

Calibration is important for DPTs because it ensures the accuracy and reliability of the pressure measurements. Over time, DPTs may become less accurate due to environmental factors or wear and tear. Regular calibration ensures that the DPT is performing within acceptable tolerances and provides accurate readings.

3. How often should DPTs be calibrated?

The frequency of calibration for DPTs depends on several factors, including the manufacturer's recommendations, the application, and the level of accuracy required. In general, DPTs should be calibrated at least once a year, but some may require more frequent calibrations.

4. Can DPTs be calibrated in-house?

Yes, DPTs can be calibrated in-house if the proper equipment and expertise are available. However, it is recommended to have DPTs calibrated by a certified calibration laboratory to ensure accurate and traceable results.

5. What is the process for calibrating a DPT?

The process for calibrating a DPT involves comparing the readings of the DPT to a known reference standard. The DPT is connected to a calibrated pressure source, and the readings are adjusted until they match the reference standard. The results are then documented and a calibration certificate is issued.

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