The Importance of Calibration for Diffused Silicon Liquid and Gas Pressure Sensors

Diffused silicon liquid and gas pressure sensors play a crucial role in industrial automation, but accurate measurement relies heavily on proper calibration. This article uses the DG1300-BZ-A-2-40 model as an example to explain the calibration process for diffused silicon sensors, covering maintenance points for CL-H, HT-316, and other series products. It also helps you master calibration techniques for models such as PMP131-C1A2L16, ensuring accurate and reliable pressure measurement data.

I. Definition and Working Principle of Diffused Silicon Pressure Sensor

Diffused silicon pressure sensors are precision measuring devices designed based on the semiconductor piezoresistive effect. Their core component is a Wheatstone bridge on a silicon wafer. When pressure is applied to the sensitive diaphragm, the resistivity of the silicon material changes, and the bridge outputs a millivolt-level signal proportional to the pressure. Taking the DG1300-BZ-A-2-40 as an example, its measuring range covers 0-40 MPa, and it uses a 316L stainless steel diaphragm, making it compatible with corrosive media measurements.

II. Preparatory work before calibration

1. Equipment Inspection : Confirm that the CL-H pressure transmitter is undamaged and that the cable connectors meet the IP65 protection rating.
2. Environmental requirements : Maintain a constant temperature of 23±5℃ and a relative humidity of ≤85%RH.
3. Standard equipment : Prepare a 0.05-grade standard pressure source and a 4½-digit digital multimeter.
4. Safety Protection : For HT-316 models with alarm control, the interlock protection must be disengaged first.

Example of calibration equipment configuration

III. Detailed Explanation of DG1300-BZ-A-2-40 Calibration Procedure

Step 1: Zero-point calibration
Disconnect the pressure port and adjust the Zero potentiometer under normal pressure to output 4.000mA (or 1.000V) for the PBM4-13.B29R.A115.2663 model. If using the HDA4744-B-600-000 version with remote signal transmission, the MODBUS register value must be checked simultaneously.

Step 2: Full-scale calibration
Apply a standard pressure of 40 MPa and adjust the Span potentiometer to a 20,000 mA output. Note that the PA-21R-16 model requires three cycles of pressurization to eliminate mechanical hysteresis.

IV. Calibration Precautions for Special Models

1. HT-316 with alarm control : Before calibration, the upper and lower limits of the alarm threshold must be set according to the JPB-CNM instruction manual.
2. Customized DG1300-BZ-A-2-2.5/AA/SZWZH : Media compatibility code and sealing material need to be confirmed.
3. High-temperature type PMP131-C1A2L16 : Temperature compensation calibration is required at the rated temperature.

V. Verification and Document Management after Calibration

After calibration is completed, a calibration record should be filled out in accordance with ISO 9001 requirements, including:
• Standard instrument serial number and validity period
• Ambient temperature and humidity data
• Deviation values at each test point (DG1300 series allows ±0.1%FS error)
• Operator's signature and date

Why choose our calibration service?

1. CNAS-accredited laboratory : Provides statutory calibration in accordance with JJG882-2019 standard.
2. Full model coverage : From the basic CL-H model to the customized PBM4-13.B38R.A115.2663 model.
3. On-site service : Supports online calibration in special locations such as explosion-proof areas.
4. Data Traceability : Provides a QR code electronic calibration certificate; authenticity can be verified by scanning the code with a mobile phone.

For customized calibration solutions for models such as DG1300-BZ-A-2-40/CJ/AM/FZ, please call 400-xxx-xxxx or visit our website for online consultation. Our pressure sensor experts will provide you with one-on-one technical support.