How to Fine-Tune a Pressure Transmitter
Pressure transmitters are devices that measure air and hydraulic pressure and convert them into standard electrical signals (such as 0-5V, 4-20mA). They are widely used in industries such as petroleum, chemical, metallurgy, power, food, paper, pharmaceuticals, and mechanical manufacturing. These devices are known for their reliability, stability, ease of installation and use, small size, light weight, and high performance-to-price ratio, making them suitable for various positive and negative pressure measurements.
To ensure the accuracy of pressure transmitters, it is necessary to fine-tune them. Below are the specific steps for fine-tuning a pressure transmitter.
1. Analog-to-Digital Fine-Tuning (Sensor Fine-Tuning)
The main tasks are complete fine-tuning and zero fine-tuning. Complete fine-tuning requires a precision three times that of the transmitter. In the hand-held device menu, navigate to Device Settings - Diagnostics and Maintenance - Calibration - Lower Limit Sensor Fine-Tuning to perform the operation. If the sensor's precision is 0.25, the lower limit fine-tuning value should be 0.06. During the entire operation, simply follow the instructions provided by the hand-held device. Then, adjust the upper limit sensor fine-tuning in the same location. Note that the upper limit fine-tuning should not exceed the maximum measurement range of the transmitter.
2. Zero Fine-Tuning
First, expose the transmitter to atmospheric pressure and connect it to the measurement loop using a hand-held device. Navigate to Device Settings - Diagnostics and Maintenance - Calibration - Sensor Fine-Tuning - Zero Fine-Tuning. Follow the hand-held device's prompts to perform the zero fine-tuning. It is important to note that the transmitter must be within 3% of zero to perform the zero fine-tuning. During fine-tuning, the transmitter's protection setting must be turned off. The protection setting is usually a red switch on the front of the transmitter, with states ON and OFF. If the protection function is enabled, the fine-tuning will not be successful.
3. Digital-to-Analog Fine-Tuning (Output Fine-Tuning)
In the hand-held device menu, navigate to Device Settings - Diagnostics and Maintenance - Calibration - Output Fine-Tuning - Digital/Analog Fine-Tuning. Set the "control loop" to manual mode. Then, according to the "Connection Reference Table" prompt, connect an accurate reference ammeter to the transmitter, paying attention to the polarity of the connections. Select OK, and set the transmitter's output to 4mA. At this point, the transmitter's output should be 4mA. Record the actual value from the reference ammeter and enter this value in the "Enter Instrument Value" prompt. Check whether the hand-held device's output matches the reference ammeter value. If they do not match, continue to enter the reference value and verify whether it matches the hand-held device's output. If they match, change the 4mA to 20mA and compare the reference value with the hand-held device's output again until they are accurate. The final step is to set the "control loop" back to automatic control to complete all operations.
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