UNI-T UT381PV Solar Irradiance Meter

UNI-T UT381PV Solar Irradiance Meter in Sri Lanka

Advanced PV Site Survey and Solar Panel Testing Instrument

The UNI-T UT381PV Solar Irradiance Meter is a professional handheld instrument for measuring solar irradiance in natural and simulated sunlight. It is designed for photovoltaic panel installation, solar plant maintenance, site assessment, PV product testing, meteorological research, and agri-environmental monitoring.

The UT381PV combines irradiance measurement with dual-channel temperature monitoring, built-in inclination and azimuth sensors, data recording, Bluetooth communication, and mobile-app connectivity. Its integrated solar panel mounting bracket and suction-cup temperature probe help technicians collect practical field measurements directly during photovoltaic installation and maintenance work.

Technical Specifications

Solar Irradiance Measurement: 0–1400 W/m² | Resolution: 1 W/m² | Accuracy: ±(5.0% of reading + 5 digits)

Alternative Irradiance Unit: 0–500 Btu/(ft²·h) | Resolution: 1 Btu/(ft²·h) | 1 Btu/(ft²·h) ≈ 3.15459 W/m²

Temperature Measurement: -40°C to 120°C / -40°F to 248°F | Resolution: 0.1°C or 0.2/1°F

Temperature Accuracy: ±1°C from -10°C to 75°C; ±2°C outside this range | ±2°F from 14°F to 167°F; ±4°F outside this range

Inclination Measurement: -90.0° to +90.0° | Resolution: 0.1° | Accuracy varies by angle

Azimuth Measurement: 0° to 360° | Resolution: 1° | Accuracy: ±7° when inclination is within -20° to +20°

Data Storage: Up to 12,800 measurement sets

Recording Interval: 1 second to 60 minutes

Bluetooth Transmission Distance: Up to 100 m in open, unobstructed conditions

Dimensions: 201 × 54.2 × 33.7 mm

Weight: Approximately 212 g without batteries

Key Features

Professional Irradiance Measurement: Measures solar irradiance from 0 to 1400 W/m² for photovoltaic installation, inspection, and maintenance applications

Dual Temperature Channels: Displays temperature from the built-in sensor and the supplied external suction-cup temperature probe

Built-In Tilt and Azimuth Sensors: Measures panel inclination from -90° to +90° and direction from 0° to 360° for solar installation assessment

Data Recording: Stores up to 12,800 sets of measurement data with selectable recording intervals from 1 second to 60 minutes

Bluetooth Connectivity: Transmits measurement data wirelessly to a compatible mobile device or UNI-T UT541 photovoltaic I-V curve analyzer

iENV Mobile App Support: Supports real-time data viewing, analysis, and PDF or CSV report export through the compatible mobile application

Visual and Audio Alerts: Provides alerts when irradiance or configured inclination conditions are outside the selected limits

Outdoor Protection: IP65-rated housing with specialized anti-UV construction and 2 m drop protection

Long Battery Operation: Operates for approximately 95 hours with Bluetooth and LED light switched off

Automatic Power-Off: Can switch off automatically after approximately 30 minutes without operation

Applications

Solar PV panel installation and commissioning

Photovoltaic plant inspection and preventive maintenance

Solar site surveying and panel orientation assessment

Solar module testing in PV laboratories

Solar irradiance monitoring in natural or simulated sunlight

Meteorological and solar-energy research

Agri-environmental monitoring and sunlight assessment

Data collection for photovoltaic I-V curve testing workflows

Important Operating Notes

Panel Temperature: Use the supplied suction-cup probe in contact with the rear or surface area of the PV panel when an external panel-temperature reading is required

Inclination Measurement: Place the meter on the PV panel or mounting surface and zero the inclination when required before taking a measurement

Azimuth Measurement: For accurate compass readings, keep the meter approximately within -20° to +20° inclination and away from metal objects and magnetic interference

Bluetooth Range: The stated 100 m transmission distance applies to open and unobstructed environments

Package Includes

1 x UNI-T UT381PV Solar Irradiance Meter

2 x AA batteries

1 x Suction-cup temperature probe

1 x Solar panel mounting bracket

1 x Cloth carrying bag

1 x User manual

1 x Safety guide

1 x General download operation guide

Downloads

📄 Download UNI-T UT381PV Data Sheet
📄 View UNI-T UT381PV User Manual