As a core component in industrial flow control, the HR-M2 pressure transmitter’s choice of diffused silicon sensor model directly affects system accuracy and cost. This article provides a detailed analysis of the characteristics of 5 mainstream models in the HR-M2 series, compares the advantages and disadvantages of products such as ST-ST950 and CY-CY3018, and offers a selection decision tree to help technical evaluators quickly match operating condition requirements and assist business decision-makers in balancing budget and performance.

Analysis of 5 Mainstream Diffused Silicon Sensor Models for HR-M2 Pressure Transmitters

The HR-M2 series pressure transmitters use diffused silicon sensor technology and are widely applied in industries such as petrochemicals, electric power, and water treatment thanks to their high accuracy and stability. This series currently mainly includes 5 models:

• HR-M2A: Basic model, suitable for general industrial environments, with a measuring range from 0-1MPa to 0-100MPa
• HR-M2B: Corrosion-resistant model, using a 316L stainless steel isolation diaphragm, suitable for the chemical industry
• HR-M2C: High-temperature model, with an operating temperature up to 150℃, suitable for boilers and thermal systems
• HR-M2D: Smart model, with HART protocol, supporting remote configuration and diagnostics
• HR-M2E: Explosion-proof model, ATEX certified, suitable for hazardous areas

Comparison of Key Performance Parameters

Comparative Analysis of HR-M2 and Competing Products

Analysis of the Drawbacks of the ST-ST950 Pressure Transmitter

As a common diffused silicon pressure transmitter on the market, the main drawback of the ST-ST950 lies in temperature stability. In environments exceeding 80℃, its zero drift is significantly higher than that of the HR-M2 series, and long-term use results in an accuracy decline of about 0.1%/year. In addition, its enclosure protection rating only reaches IP54, making it unsuitable for dusty or humid environments.

Performance Comparison Between CY-CY3018 and HR-M2

CY-CY3018 has a price advantage, but the ceramic piezoresistive sensor it uses is inferior to the HR-M2’s diffused silicon sensor in impact resistance. Actual testing shows that under the same vibration conditions, the service life of HR-M2 is more than 1.5 times that of CY-CY3018. For critical processes requiring long-term stable operation, HR-M2 is undoubtedly the better choice.

In the field of load cells, Domestic HGLS-5 Tension and Compression S-Type Stainless Steel Load Cell also demonstrates excellent performance, with a combined accuracy of 0.02～0.03, making it suitable for various scenarios such as batching scales and crane scales.

HR-M2 Pressure Transmitter Selection Decision Tree

To help users quickly select the appropriate model, we have designed the following selection process:

1. Determine the measured medium: choose HR-M2B for corrosive media, and HR-M2A for ordinary media
2. Assess ambient temperature: choose HR-M2C for temperatures exceeding 85℃
3. Whether smart functions are needed: if yes, choose HR-M2D
4. Whether it is a hazardous area: if yes, HR-M2E must be selected
5. Budget consideration: HR-M2A offers the highest cost performance, while HR-M2D provides the most complete functions

Recommendations for Balancing Budget and Performance

For users with limited budgets but requiring reliability, HR-M2A is an ideal choice. For process industry users, HR-M2D is recommended as a priority, as its smart diagnostic function can significantly reduce maintenance costs. According to statistics, users adopting HR-M2D can reduce downtime by an average of 30%.

Technical Advantages of Diffused Silicon Sensors

Compared with traditional technology, the diffused silicon sensor used in HR-M2 offers significant advantages:

• Higher sensitivity（10-50mV/V）
• Better long-term stability（<0.1%/year）
• Stronger anti-interference capability
• Wider operating temperature range

These features make HR-M2 particularly outstanding when measuring media such as steam and gas. Compared with DG-DG1210, HR-M2 has a 20% faster response time and is more suitable for dynamic pressure measurement.

Installation and Maintenance Highlights

Installation Comparison with HT-805 Pressure Transmitter

HR-M2 uses a standard G1/2" process connection and is compatible with HT-805. However, the sealing design of HR-M2 is superior, requiring no additional sealant during installation. In terms of maintenance intervals, HR-M2 is recommended to be calibrated once every 2 years, while HT-805 requires annual calibration.

Common Fault Troubleshooting

If unstable output occurs, it is recommended to check the following steps:

1. Check whether the power supply voltage is stable（recommended 24VDC±10%）
2. Confirm that there is no leakage at the process connection
3. Eliminate electromagnetic interference（keep a distance from equipment such as frequency converters）
4. Check whether the cable shielding is intact

Industry Application Cases

In a petrochemical enterprise project, after HR-M2D replaced the original CHR-CHR3000, the overall accuracy of the measurement system improved from 0.5% to 0.2%, saving about 150,000 yuan in annual maintenance costs. Its HART function enabled remote diagnostics, reducing on-site inspection frequency by 90%.

In the food and beverage industry, HR-M2B, due to its excellent corrosion resistance, has performed outstandingly in CIP cleaning systems, achieving a service life 2 times the industry average.

Summary and Selection Recommendations

The HR-M2 pressure transmitter series offers multiple models to meet different operating condition requirements:

• For cost performance: HR-M2A
• For corrosive environments: HR-M2B
• For high-temperature applications: HR-M2C
• For smart requirements: HR-M2D
• For explosion-proof requirements: HR-M2E

Compared with BP-BP200, HR-M2 has greater advantages in accuracy and stability; compared with SP-802, HR-M2 has a higher protection rating and is suitable for harsher environments. Whether for technical evaluators or business decision-makers, the most suitable model should be selected based on actual operating condition requirements and technical budget.

If you need more detailed technical parameters or customized solutions, please contact our professional technical team, and we will provide you with the optimal product configuration recommendations.