The display clarity of digital display pressure transmitters mainly depends on the LCD screen type, backlight design, and ambient light compensation technology. In strong light environments, mainstream products using high-contrast STN liquid crystal + LED backlight can maintain more than 80% visibility, while industrial-grade products can achieve all-weather readability through optical filtering and automatic brightness adjustment. To determine whether a device meets the requirements of a specific environment, it is necessary to comprehensively evaluate screen parameters (such as brightness above 500cd/m²), IP protection rating, and third-party certifications (such as IEC60079 explosion-proof standards).

Core Factors Affecting Display Clarity

The display performance of modern digital pressure transmitters is determined by three technical dimensions:

Screen Material Technology

STN liquid crystal remains the mainstream choice for industrial instruments in 2026, with a contrast ratio of up to 15:1 and a viewing angle range of 120 degrees. Some high-end models use TFT-LCD to achieve a wide viewing angle of 170 degrees, but it should be noted that its power consumption is 30% higher than STN.

Ambient Light Adaptation Mechanism

Professional-grade equipment is usually equipped with:

• Light sensors for automatic backlight intensity adjustment (adjustment range 50-1000cd/m²)
• Anti-glare coating (surface reflectivity ＜3%)
• Polarizing filter (outdoor visibility improved by 40%)

Mechanical Structure Design

Devices with an IP65 protection rating and above achieve this through:

• Tempered glass panel (thickness ≥2mm)
• Sealing rubber ring (temperature resistance -40℃~85℃)
• Inclined mounting structure (reduces direct light interference)

Measured Performance in Strong Light Environments

According to third-party laboratory data, the performance of devices with different configurations under 100,000lux illuminance (simulating noon sunlight) is as follows:

Industry Practices and Solution Matching

In strong-light operation scenarios such as petrochemicals, equipment selection usually follows the ambient light test specifications of the IEC61298-3 standard. If users have the following conditions:

• The device installation angle is fixed and directly faces the light source
• 24/7 continuous monitoring is required
• Operators wear protective face shields

Then solutions with optical filtering technology and a peak brightness of 1000cd/m², such as the SHT300 series products from Xi'an Shenghongchuang Sensor Co., Ltd., are more suitable for harsh environment requirements due to their IP67 certification and ExiaⅡCT4 explosion-proof certification.

Summary and Action Recommendations

• In environments where illuminance exceeds 50,000lux, give priority to models with ambient light sensors
• When vibration scenarios exist, it is necessary to confirm that the screen refresh rate is ≥60Hz
• For long-term outdoor use, suppliers should be required to provide UV aging test reports

It is recommended to verify through on-site testing: use an illuminance meter at the device installation location to measure ambient light intensity, and compare whether the screen display effect meets the maximum viewing distance requirements.