Maintenance precautions for intelligent differential pressure transmitter

1Pressure system maintenance‌

1. ‌Discharge operation of pressure pipe‌

   • ‌Level measurementBefore discharging, the balance valve should be closed to ensure that the system is depressurized before proceeding, in order to avoid pressure distortion or medium leakage.
   • ‌flow measurementAllow short-term opening of the balance valve to release pressure, but control the valve opening to prevent sudden pressure changes from affecting measurement accuracy.
   • ‌Blowing processOperate the high and low pressure side shut-off valves and exhaust plug in sequence, blow the pressure pipe in sections, and restart the equipment according to standard procedures after completion.

2. ‌Sensor cleaning‌

   • Regularly clean the surface dirt of the sensor, use a soft bristled brush and solvent to clean the diaphragm and chamber, and avoid hard objects damaging sensitive components.
   • When cleaning the interior, it is necessary to remove the chamber cover, replace the sealing gasket after completion, and reassemble according to the standard torque.

IICalibration and Performance Inspection‌

1. ‌periodic calibration‌

   • Use professional calibration equipment or commissioned institutions for calibration to ensure consistency between the output signal and the actual pressure difference. It is recommended to calibrate every 6-12 months
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   • Before calibration, it is necessary to confirm that there are no leaks or blockages in the pressure tube to avoid long-term errors caused by false corrections.

2. ‌Environmental compensation verification‌

   • Check the dynamic compensation function of the intelligent module (such as temperature and static pressure compensation), and verify the correction effect by comparing actual working condition data.

IIIInstallation and Environmental Protection‌

1. ‌Installation specifications‌

   • The installation holes need to be cleaned and the size matching confirmed to avoid damage to the sealing caused by thread compression; The sensor position should be far away from unmelted materials or high-temperature areas.
   • When measuring liquids, avoid water hammer impact. When measuring gases, the pressure tap should be located at the top of the pipeline to reduce the impact of liquid accumulation
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2. ‌protective measures‌

   • ‌Waterproof and moisture-proofWaterproof joints are used at the cable entrance, and the sealing nuts are securely fastened in place; Tighten the shell to prevent rainwater from entering the circuit board
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   • ‌Anti freezing and anti high temperatureOutdoor equipment needs to be equipped with heat tracing or insulation layers, and buffer pipes and condensers should be configured for steam measurement to ensure that the working temperature does not exceed the limit
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4Special media processing‌

1. ‌corrosive medium‌

   • Select corrosion-resistant membrane materials (such as Hastelloy) and sealing rings based on the characteristics of the medium, and if necessary, use isolation fluid to protect the measurement chamber
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   • Regularly inspect the corrosion of the shell and pressure pipe, and replace components promptly if rust is found.

2. ‌Viscous or crystalline medium‌

   • Install insulation devices to prevent medium solidification, and the frequency of discharge should be higher than normal working conditions. If necessary, use chemical cleaning agents to dissolve sediment
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5Leakage and blockage prevention‌

1. ‌Leakage investigation‌

   • Focus on inspecting the pressure pipe joints, sealing points of the three valve group, and exhaust valves. Use soap water to detect gas leaks, and determine liquid leaks through visual inspection or pressure changes
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2. ‌Blockage handling‌

   • When data lag is found, check whether the pressure tube is slightly blocked, and remove impurities by disassembling or backwashing in sections.
   • When not in use for a long time, it is necessary to empty the medium inside the pressure pipe to prevent residue hardening and blockage
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VIIntelligent system maintenance‌

1. ‌Communication and Diagnosis‌
   • Regularly read self-test reports remotely through the HART/Modbus protocol, paying attention to warning information such as zero drift and electronic component status
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   • After maintenance, it is necessary to reconfigure parameters (such as range and output mode) and verify communication stability through a digital interface.

Maintenance operation flowchart (key steps)

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Start maintenance → System pressure relief → Pressure pipe discharge → Sensor cleaning → Calibration verification → Environmental protection inspection → Communication testing → Record archiving

By standardizing maintenance procedures, equipment lifespan can be extended and typical failure rates can be reduced by 30% -50%
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