As a key device in industrial flow control, the stable operation of the DLT-DLT200 pressure transmitter's diffused silicon sensor directly affects production efficiency. This article provides professional solutions for common faults of diffused silicon pressure sensors, covering the complete process of calibration methods, accuracy maintenance, and fault handling, helping contract operators quickly solve on-site application problems of transmitters in the PH-PH210, OT-1, and other series.

Working Principle and Common Fault Types of Diffused Silicon Sensors

The diffused silicon pressure sensor is based on the piezoresistive effect principle. When the medium pressure acts on the sensing element, the silicon diaphragm deforms, causing a change in the resistance value of the Wheatstone bridge and ultimately outputting a standard electrical signal. Taking the A-10 pressure transmitter as an example, its typical faults include: zero drift（accounting for 42%）, signal fluctuation（28%）, overload damage（15%）, and temperature compensation failure（10%）. Contract operators should pay special attention to the nonlinear error that occurs during the calibration process of the OC-1 pressure transmitter, which is often directly related to uneven stress distribution on the sensor diaphragm.

Fault Diagnosis and Handling Process

Step 1: Signal Abnormality Troubleshooting. When the PM-PM200 pressure transmitter displays abnormalities, first check whether the power supply voltage is stable（within the 9-36VDC range）, and then use a multimeter to measure whether the output signal is within the 4-20mA range. If intermittent signal issues similar to those of the FDS-S pressure transmitter occur, it is recommended to give priority to replacing the four-core shielded cable. This type of fault accounts for 67% in hydraulic systems.

Step 2: Mechanical Damage Inspection. For cases where the accuracy grade of the SPB-SPB101 pressure transmitter declines, disassemble and inspect whether the 316 stainless steel diaphragm has corrosion or scratches. Data from the petrochemical industry show that diaphragm wear caused by medium crystallization accounts for 39% of the total faults. At this time, you may consider upgrading to Domestic Direct Cable Pressure Transmitter P499 Constant Pressure Water Supply Negative Pressure Sensor, which adopts a reinforced diaphragm design, with overload capacity increased to 300MPa.

Maintenance Technical Specifications

Procurement Selection and Replacement Solutions

When the 501 pressure transmitter needs to be updated, it is recommended to compare the following parameters:

• Range matching degree: the CHSP-210 series covers -0.1MPa to 250MPa
• Output signal type: two-wire 4-20mA is more suitable for long-distance transmission
• Medium compatibility: 316 stainless steel can resist H2S corrosion

For projects with limited budgets, you may consider using the DLT-DLT200 and P499 transmitters in combination, the latter being particularly cost-effective in constant pressure water supply scenarios.

Why Choose Our Solution

Xi'an Shenghongchuang Instrument Co., Ltd. has 15 years of experience in diffused silicon sensor R&D, and all products have passed ISO9001 certification. We provide lifetime technical support for the PH-PH210, OT-1, and other series, with on-site fault response time not exceeding 24 hours. Click to learn the detailed technical parameters of Domestic Direct Cable Pressure Transmitter P499 Constant Pressure Water Supply Negative Pressure Sensor and obtain customized solutions.