Class A pyranometer 3S-TP-MB-A

ModbusRS-485Modbus RTU

Product description
The SEVEN 3S-TP-MB-A thermopile pyranometer measures solar irradiance (W/m²) with ISO 9060:2018 Class A and IEC 61724-1:2021 Class A performance. Equipped with an advanced thermopile detector and optical diffuser, it delivers stable, fast and spectrally flat measurements across 280–3000 nm for solar, meteorological and agricultural monitoring.

Measured parameters

• Global Horizontal Irradiance (GHI) or Plane of Array (POA) irradiance
• Internal temperature
• Housing temperature
• Internal humidity

How it works
The pyranometer converts the temperature difference generated on the thermopile absorbing surface into a voltage proportional to irradiance. A glass dome captures direct and diffuse radiation from the entire hemisphere (2π sr), providing rapid response and accurate readings in W/m². Spectral coverage is 280–3000 nm.

Why choose SEVEN 3S-TP-MB-A

• Class A accuracy: complies with ISO 9060:2018 and IEC 61724-1:2021 for high-precision irradiance measurement.
• Multiparameter monitoring: irradiance, internal and housing temperature, and internal humidity.
• Fast response and low zero-offsets suitable for dynamic monitoring applications.
• Rugged design: IP67 protection for outdoor and harsh environments.
• Easy integration: RS485 Modbus RTU communication; optional Modbus TCP/IP.

Installation and maintenance

• Unpacking and inspection: verify all components and check for damage.
• Site selection: install with an unobstructed 180° view of the sky, free from shading.
• Mounting: level and secure the pyranometer on a stable support.
• Electrical connection: connect to 12–30 V DC power and data logger following wiring diagrams.
• Configuration: set communication parameters via configuration tool.
• Daily: inspect for visible damage or obstructions.
• Weekly: clean the dome to remove dust and debris.
• Monthly: verify data output and system integration.
• Annually: perform full system check and calibration.
• Recalibration: recommended every two years per IEC 61724-1:2021; up to five years possible due to stable diffusers.

Technical specifications

• Item Code: 3S-TP-MB-A
• Measured data: GHI or POA irradiance, internal & housing temperature, internal humidity
• Sensor type: Thermopile
• Spectral range (50% points): 280–3000 nm
• Irradiance range: 0–4000 W/m²
• Response time (95%): 0.5 s (≤ 10 s as per ISO 9060:2018 Class A)
• Zero offset A – Thermal radiation (200 W/m²): ±1 W/m² (±7 W/m² per ISO 9060:2018 Class A)
• Zero offset B – Temperature change (5 K/hr): ±1.5 W/m² (±2 W/m² per ISO 9060:2018 Class A)
• Total zero offset C: ±3 W/m² (±10 W/m² per ISO 9060:2018 Class A)
• Non-stability (change/year): <0.5% (±0.8% per ISO 9060:2018 Class A)
• Non-linearity (100–1000 W/m²): ±0.2% (±0.5% per ISO 9060:2018 Class A)
• Directional response (1000 W/m² | 0–80°): ±10 W/m²
• Spectral error: ±0.2%
• Temperature response (-20°C to 50°C): ±0.4%
• Irradiance resolution: 0.1 W/m²
• Internal humidity range: 0–100% RH; accuracy: ±1% RH (20–70%) @25°C; resolution: 1%
• Internal temperature range: -40°C to +85°C; accuracy: ±0.1°C (5–60°C) @20–80% RH; resolution: 0.1°C
• Housing temperature range: -40°C to +85°C; accuracy: ±0.2°C; resolution: 0.1°C
• Bubble level accuracy: ±0.1°
• Viewing angle: 2π sr
• Data output: RS485 up to 38400 Baud
• Communication protocol: Modbus RTU (optional Modbus TCP/IP)
• Output rate: 1/s
• Operating temperature: -40°C to +85°C
• Supply voltage: 12–30 V DC
• Power consumption: 20 mA @ 24 V DC
• Cable: 3x2x0.14 mm² LI2(ST)C11Y-PUR, UV and weather resistant; standard length 3 m (custom lengths available)
• Galvanic isolation: 1000 V between power supply and RS485 bus
• IP rating: IP67
• Dimensions: Ø 140 mm x 110 mm
• Sensor housing material: alloy aluminum
• Shade disk material: ABS
• Weight: 0.98 kg
• Standards: ISO 9060:2018 (Fast Response Spectrally Flat Class A, Secondary Standard); IEC 61724-1:2021 Class A; ISO/TR 9901:1990; ISO 9847