The AZ-402 pressure transmitter plays a key role in industrial automation control, and any sudden failure will directly affect production safety and efficiency. This article provides a 3-step quick diagnostic method for common pressure transmitter faults in models such as the AC-P2 series and BS-602, helping technicians quickly identify issues such as zero drift and abnormal signals in the AZ-402 pressure transmitter, and provides general repair solutions for similar products such as the JSRY-316T.

I. Common Types of Pressure Transmitter Failures and Their Impact

In flow control equipment, failures of pressure transmitters such as the AZ-402 and AC-P2-1 are usually manifested as abnormal signal output, zero drift, or complete lack of response. These failures not only affect the accuracy of production data, but may also trigger chain reactions, causing the entire control system to fail. According to industry data, about 60% of pressure transmitter failures stem from the following three types of problems:

• Abnormal signal output: Manifested as unstable output signals, sudden jumps, or exceeding the measurement range, commonly seen in models such as AC-P2-2 and BS-602.
• Zero drift: When there is no pressure input, the output signal is not zero, affecting measurement accuracy. This problem is likely to occur in AZ-402 and JSRY pressure transmitters.
• Hardware damage: Including diaphragm rupture and circuit board burnout, commonly seen in equipment such as the MH1100 or NOS-Y202 operating under long-term high load.

II. Detailed Explanation of the 3-Step Quick Diagnosis Method

1. Preliminary Inspection and Signal Testing

First, use a multimeter to check whether the supply voltage of the AZ-402 pressure transmitter is stable (usually 24VDC±10%). If the voltage is normal but the output signal is abnormal, refer to the following process:

If the test results deviate from the above expectations, it may indicate a fault in the sensor or signal conditioning circuit of models such as the JSRY-316T.

2. Zero and Range Calibration

For smart transmitters such as the NOS-Y203 or OPEC201, software calibration can be performed through the built-in menu:

1. Enter calibration mode and select the "Zero Trim" function.
2. Confirm the zero output under no-pressure conditions.
3. Use a standard pressure source to apply full-scale pressure and adjust the "Span Trim" parameter.
4. Save the settings and exit, then repeat the test to verify linearity.

Note: Hardware calibration requires professional equipment, and it is recommended to contact the manufacturer or an authorized service provider for handling.

3. Hardware Diagnosis and Replacement

If software calibration is ineffective, the following hardware components need to be checked:

• Pressure sensor diaphragm: Observe whether there is deformation, cracking, or corrosion.
• Circuit board: Check for obvious damage such as bulging capacitors and burnt resistors.
• Cables and connectors: Test insulation resistance to ensure there is no short circuit/open circuit.

For products with modular design such as the AC-P2-1, replacing the sensor module can be tried to verify the fault point.

III. General Repair Solutions and Preventive Measures

1. Repair Reference for Similar Products

The following are corresponding solutions for common pressure transmitter failures:

2. Daily Maintenance Recommendations

Key measures to extend the service life of pressure transmitters such as the MH1100 and NOS-Y202:

• Carry out a basic calibration check once every quarter
• Avoid medium crystallization or clogging, and flush the pressure guiding pipeline regularly
• Use anti-vibration brackets to secure equipment in vibration environments
• Record historical fault data and establish a predictive maintenance model

IV. Summary and Professional Support

Through the 3-step diagnostic method in this article, technicians can quickly resolve common faults of pressure transmitters such as the AZ-402 and AC-P2-2. As a professional pressure sensor manufacturer, Xi'an Shenghongchuang Instrument Co., Ltd. provides technical support and original factory parts for its full product range. If you encounter complex faults or require batch testing, our engineering team can provide on-site service and customized solutions.

Contact our technical team now: Obtain the complete repair manual for the AZ-402 pressure transmitter or schedule calibration services to ensure the continuous and stable operation of your flow control system.