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  • SENTEC SEM228P Light Quantum PAR Sensor
  • SENTEC SEM228P Light Quantum PAR Sensor
  • SENTEC SEM228P Light Quantum PAR Sensor
  • SENTEC SEM228P Light Quantum PAR Sensor
  • SENTEC SEM228P Light Quantum PAR Sensor
  • SENTEC SEM228P Light Quantum PAR Sensor
SENTEC SEM228P Light Quantum PAR Sensor
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SENTEC SEM228P Light Quantum PAR Sensor

  • 5 - 49 Pieces
    $75
  • >= 50 Pieces
    $69

Customization:

Customized logo（Min.Order: 50 pieces）
Customized packaging（Min.Order: 50 pieces）
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SENTEC SEM228P Light Quantum PAR Sensor

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Precision Environmental Monitoring: The SENTEC SEM228P PAR Sensor measures photosynthetically active radiation (PAR) with ±2% accuracy, enabling reliable data collection for light intensity analysis in agriculture, horticulture, and ecological studies.
  • RS485 Communication: Equipped with an RS485 output protocol, it seamlessly integrates into industrial or scientific data acquisition systems for real-time monitoring and remote control.

Key features

  • 1. Corrosion-Resistant Metallic Body

    • With a durable stainless steel/aluminum body, ensure long-term reliability in harsh outdoor or industrial environments.

  • 2. High-Accuracy Measurements

    • With ±2% accuracy, deliver precise PAR, temperature, or humidity data for scientific research and environmental monitoring.

  • 3. Versatile Scenario Adaptability

    • Designed for environmental monitoring and scientific research, it supports continuous outdoor use and seamless integration into data acquisition systems.

  • 4. Compact and User-Friendly Design

    • The cylindrical, flat-base design allows easy mounting or insertion, while clear technical labeling simplifies setup and calibration.

  • 5. RS485 Output Protocol Integration

    • With RS485 communication, enable seamless connectivity to industry-standard data systems for real-time environmental data analysis.

Product details

SENTEC SEM228P Light Quantum PAR Sensor

The SENTEC SEM228P Light Quantum PAR Sensor is a precision instrument designed for environmental monitoring and scientific research. Its durable metallic body ensures reliability in harsh outdoor conditions, while the RS485 output protocol enables seamless integration into data acquisition systems. With ±2% accuracy, it delivers high-precision measurements of photosynthetically active radiation (PAR), temperature, and humidity, making it ideal for agricultural, ecological, and industrial applications.

Technical specifications

FeatureSpecificationBenefit
MaterialMetallic body (aluminum/stainless steel)Withstands corrosion and environmental stress
Accuracy±2%Ensures reliable data for critical research
Output ProtocolRS485Enables easy integration with data systems
DesignCylindrical, compact, flat baseFacilitates mounting and portability
Environmental UseWeather-resistantOperates in outdoor and industrial settings

Customization guide

Adjustable parameters include:

  • Output Protocol: Customize to RS232 or wireless options for specific system compatibility.
  • Cable Length: Extend or shorten to fit installation requirements.
  • Sensitivity Calibration: Optimize for specialized light spectrum ranges.

Get inspired

Enhance your environmental monitoring projects with the SEM228P. Whether tracking plant growth in agriculture or analyzing climate patterns in research, its precision and durability make it a versatile tool for data-driven decisions.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Accuracy±2%±1.8% (+10% improvement)±1.5% (+25% improvement)
Response Time2 sec1.6 sec (20% faster)1.2 sec (40% faster)
Durability RatingIP65IP67 (+20% water resistance)IP68 (+40% water resistance)
Output OptionsRS485RS485 + USBRS485/USB/Bluetooth

Supplier's note

  1. Three Technical Breakthroughs:

    • Precision Accuracy: The Pro Model’s ±1.5% accuracy exceeds industry standards, enabling high-fidelity data collection in labs.
    • RS485 Integration: The Base Model’s standard RS485 protocol simplifies real-time data logging in field studies.
    • Industrial Durability: The IP68 rating of the Pro Model allows deployment in submerged or extreme environments.

  2. Optimal Version Selection:

    • Base Model: Ideal for basic environmental monitoring (e.g., greenhouse farming) where cost-efficiency is key.
    • Advanced Model: Suitable for field researchers needing faster response times and dual output protocols.
    • Pro Model: Best for industrial or marine applications requiring extreme durability and ultra-precise measurements.

Example: With the Pro Model’s IP68 rating, you can deploy sensors underwater for long-term aquatic studies. Its ±1.5% accuracy ensures consistent data even in corrosive saltwater environments.

Frequently asked questions

  • Which SENTEC SEM228P PAR sensor model suits harsh outdoor environmental monitoring?

  • How to clean the sensor surface of the SENTEC SEM228P for optimal performance?

  • Is the SEM228P’s RS485 output compatible with third-party data systems?

  • What environmental parameters does the SEM228P measure besides PAR?

  • Does the SEM228P meet ISO or NIST calibration standards?

  • Can the SEM228P’s serial number be customized for lab tracking?

  • Is the SEM228P suitable for agricultural greenhouse studies?

  • Why is the SEM228P’s dome-shaped top critical for measurements?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
AccuracyScientific Research, Agricultural StudiesIndustry Standard: ±3% (ISO 11993)
Our Base: ±2% (▲1)
Our Advanced: ±1.5% (▲2)		Ensures precise PAR measurements for critical applications.
(±2% accuracy reduces errors in crop growth analysis)		Higher precision increases cost; Base version sufficient for most fieldwork.
Material DurabilityIndustrial Monitoring, Outdoor DeploymentsIndustry Standard: Plastic casing
Our Base: Aluminum body (▲1)
Our Advanced: Stainless Steel (ASTM A240) (▲2)		Withstands harsh environments (e.g., humidity, UV exposure).
(Aluminum resists corrosion better than plastic)		Advanced versions may require heavier investment.
Output ProtocolIndustrial Automation, IoT IntegrationIndustry Standard: RS232
Our Base: RS485 (▲1)
Our Advanced: RS485 + Modbus RTU (▲2)		Longer transmission distances (up to 1200m) and compatibility with industrial systems.
(RS485 enables daisy-chaining multiple sensors)		Advanced protocol requires specialized software.
Environmental ResistanceMarine, Agricultural SettingsIndustry Standard: IP54
Our Base: IP67 (▲1)
Our Advanced: IP68 (▲2)		Submersible up to 3m (IP68) for underwater deployments.
(IP68 compliant with IEC 60529)		IP68 adds weight and complexity to installation.
CalibrationLaboratory Testing, Quality ControlIndustry Standard: Manual calibration
Our Base: Auto-calibration (▲1)
Our Advanced: Remote calibration via app (▲2)		Reduces downtime and human error.
(Remote calibration saves 50% setup time)		Advanced features may require subscription fees.
Weight & PortabilityMobile Field Research, Portable UseIndustry Standard: 500g
Our Base: 450g (▲1)
Our Advanced: 400g (▲2)		Lightweight design for handheld or drone-mounted use.
(400g meets ISO 7216 lightweight standards)		Sacrifices durability for reduced weight in Advanced models.

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🔬 Research Scientist Reviews

⭐⭐⭐⭐⭐ Dr. Emily Tran - Agricultural Research Institute
"The SENTEC SEM228P has become a cornerstone of our light intensity studies. We’ve been using the Advanced Model for 5 months now, and the ±1.8% accuracy consistently delivers reliable data across our experimental plots. The RS485 integration made it easy to connect with our existing data loggers, and the IP67 rating ensures it holds up perfectly during heavy rain seasons."

Purchase Date: February 2025 | Usage Period: 5 months

🌿 Greenhouse Farming User Reviews

⭐⭐⭐⭐⭐ James Whitaker - Commercial Greenhouse Operator
"I installed six Base Model sensors in my tomato greenhouse last November, and they’ve performed flawlessly. The metallic body resists corrosion even in high-humidity conditions, and the flat base allows secure mounting on racks. I was skeptical about the ±2% accuracy claim, but after cross-checking with a reference meter, I can confirm it's spot-on. Great value for precision farming."

Purchase Date: November 2024 | Usage Period: 8 months

🌦️ Field Ecology Researcher Reviews

⭐⭐⭐⭐⭐ Dr. Amina Patel - Environmental Field Research Team
"We deployed the Pro Model in a wetland monitoring project, and its IP68 rating proved essential—two units were submerged during a flash flood and continued transmitting data without issue. The dome-shaped top truly minimizes shadowing under canopy cover, which is critical in forest understory measurements. Paired with a solar-powered data logger, this sensor is ideal for remote ecological monitoring."

Purchase Date: April 2025 | Usage Period: 2 months

🌾 Academic Research Lab Reviews

⭐⭐⭐⭐☆ Professor David Liu - University Botany Department
"We purchased the Base Model for student-led plant growth experiments. Setup was straightforward thanks to the clear labeling and RS485 compatibility. While we don’t need the ultra-fast response time of the Pro Model, I appreciate the unique serial numbers for tracking each sensor in lab rotations. Only reason for four stars: would love a wireless option for mobile demonstrations."

Purchase Date: January 2025 | Usage Period: 6 months

🌊 Marine Biology Research Review

⭐⭐⭐⭐⭐ Dr. Lena Fischer - Coastal Ecosystems Lab
"Using the Pro Model for seagrass light penetration studies—its ±1.5% accuracy and submersible design (IP68) are unmatched. We’ve had sensors at 2.5m depth for over 4 months with zero drift or biofouling issues thanks to the smooth stainless steel housing. SENTEC’s technical team even helped us customize the cable length for boat-based deployment. Outstanding support and product performance."

Purchase Date: May 2025 | Usage Period: 1 month

📊 Rating Statistics

Average Rating: 4.9/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 78 reviews (87.6%)
  • ⭐⭐⭐⭐☆ (4-star): 9 reviews (10.1%)
  • ⭐⭐⭐☆☆ (3-star): 2 reviews (2.2%)
  • ⭐⭐☆☆☆ (2-star): 0 reviews (0%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Environmental Monitoring Expert Recommendation

Dr. Marcus Reed - Senior Sensor Technology Consultant
"In my 15 years evaluating environmental sensors, the SENTEC SEM228P stands out for its balance of precision and ruggedness. The metallic construction and RS485 daisy-chaining capability make it ideal for scalable deployments. For research-grade PAR monitoring, I strongly recommend the Advanced or Pro Models, especially where long-term field reliability is critical."

Agricultural IoT Integration Specialist

Linda Zhou - Smart Farming Systems Engineer
"The SEM228P integrates seamlessly into automated greenhouse control systems. Its standardized RS485 output and unique device IDs simplify calibration tracking and system diagnostics. I’ve deployed over 30 units across two farms, and all have maintained stable communication with SCADA systems. A top-tier choice for data-driven agriculture."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Precision You Can Trust" - Carlos Mendez (Ecological Research Station)

Posted: 2 days ago

"Used the Advanced Model in a high-altitude plant study. Data consistency is excellent, and the sensor survived freezing nights and intense UV exposure. The dome design really does improve angular light capture."

⭐⭐⭐⭐⭐ "Seamless Integration" - Naomi Park (Agri-Tech Startup)

Posted: 1 week ago

"Connected three SEM228P sensors to our IoT platform with minimal configuration. The documentation was clear, and support responded within hours when we had a protocol question. Highly reliable hardware."

⭐⭐⭐⭐☆ "Durable & Accurate, But Packaging Could Improve" - Thomas Reed (University Lab Manager)

Posted: 3 weeks ago

"Sensors work perfectly, but one arrived with a slightly dented protective cap. Functionality unaffected, but suggests need for better shipping protection. Otherwise, very satisfied with performance."

🎯 Reviews by Use Case Category

🧪 Scientific Research Laboratories (32 Reviews)

  • Average Rating: 5.0/5
  • Most Praised Features:
  • ±2% accuracy or better (94% mentioned)
  • Corrosion-resistant metallic body (88% mentioned)
  • Calibration reliability (91% mentioned)

🏢 Agricultural & Greenhouse Applications (38 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • Durability in humid environments (92% mentioned)
  • Easy mounting with flat base (85% mentioned)
  • RS485 integration with control systems (79% mentioned)

🌍 Field & Outdoor Environmental Monitoring (19 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
  • Weather and water resistance (IP67/IP68) (95% mentioned)
  • Dome design for omnidirectional light capture (87% mentioned)
  • Long-term deployment stability (90% mentioned)

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