Class A pyranometer 3S-TP-MB-A

Modbus RTURS-485Modbus

Product overview
The SEVEN 3S-TP-MB-A thermopile pyranometer measures solar irradiance (W/m²) and meets ISO 9060:2018 Class A and IEC 61724-1:2021 Class A requirements. Its advanced thermopile detector and optical diffuser deliver stable, fast and spectrally‑flat measurements across 280–3000 nm, suitable for solar resource assessment, PV monitoring, meteorology and agricultural applications.

How it works

• The sensor converts the temperature difference generated on the thermopile absorbing surface into a voltage proportional to irradiance.
• A glass dome captures both direct and diffuse radiation over the hemisphere (2π sr) to provide accurate W/m² readings for GHI or, when mounted on a tilted plane, POA.
• Spectral response and low zero‑offset ensure reliable data under varying environmental conditions.

Key features

• Class A performance according to ISO 9060:2018 and IEC 61724-1:2021.
• Measures GHI or POA irradiance plus internal & housing temperature, internal humidity and pressure, and sensor tilt angle.
• Spectral range 280–3000 nm; irradiance range to +4000 W/m²; resolution 0.1 W/m².
• Fast response (95% in 0.5 s), low zero offsets and excellent long‑term stability.
• RS485 output up to 38400 Baud with Modbus RTU (option for Modbus TCP/IP).
• Rugged, weather‑resistant design with anodized aluminum housing and IP68 protection.

Installation and maintenance

• Unpack and inspect: verify all components and check for transport damage.
• Site selection: choose a location with an unobstructed 180° view of the sky and no shading.
• Mounting: install the instrument level and secure it to a stable support; use the bubble level for precise leveling.
• Electrical connection: connect 12–30 V DC power and RS485 to the data logger following the wiring diagram in the manual.
• Configuration: set communication parameters with the configuration tool and verify sampling/output rate.

Maintenance

• Daily: visual inspection for damage or obstructions.
• Weekly: clean the glass dome to remove dust, bird droppings or debris.
• Monthly: check data output and system integration; confirm sensor tilt and bubble level.
• Annually: full system check and calibration verification.
• Recalibration recommendation: standard practice every two years; diffuser stability may allow up to five years between recalibrations subject to site conditions.

Documents
Datasheet and user manual (PDF) available for download. Calibration certificate and technical drawings can be provided on request.

Technical specifications

• Item Code — 3S-TP-MB-A
• Measured Data — GHI or POA irradiance; internal & housing temperature; internal humidity & pressure; sensor tilt angle
• Sensor Type — Thermopile
• Spectral Range (50% points) — 280–3000 nm
• Irradiance Range — -10 … +4000 W/m²
• Nominal Sensitivity — 8–14 µV/(W/m²)
• Response Time (95%) — 0.5 s
• Zero Offset A — Thermal radiation (200 W/m²): ±1 W/m²
• Zero Offset B — Temperature change (5 K/hr): ±1.5 W/m²
• Total Zero Offset C — ±3 W/m²
• Non‑stability (change/year) — <0.5%
• Non‑linearity (100–1000 W/m²) — ±0.2%
• 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 — 0–100% RH; accuracy ±1% RH (20–70%) @25°C; resolution 1%
• Internal Temperature — -40°C to +85°C; accuracy ±0.1°C (5–60°C) @20–80% RH; resolution 0.1°C
• Housing Temperature — -40°C to +85°C; accuracy ±0.2°C; resolution 0.1°C
• Sensor Tilt Angle — 0°–180°; accuracy ±0.5°; resolution 0.1°
• Internal Pressure — 260–1260 hPa; accuracy 0.5 hPa; resolution 0.1 hPa
• 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 Range — -40°C to +85°C
• Supply Voltage — 12–30 V DC
• Power Consumption — 45 mA @ 24 V DC
• Cable — 3x2x0.14 mm² LI2(ST)C11Y‑PUR, 26 AWG, UV and weather resistant
• Cable Length — 3 m standard (custom lengths available)
• Galvanic Isolation — 1000 V between power supply and RS485 bus
• IP Rating — IP68
• Dimensions — Ø 140 mm x 120 mm
• Sensor Housing Material — Anodized aluminum
• Shade Disk Material — ABS
• Weight — 0.68 kg
• Standards — ISO 9060:2018 (Fast Response Spectrally Flat Class A); IEC 61724-1:2021 Class A; ISO/TR 9901:1990; ISO 9847