Class C pyranometer SMP3-A

analogdigitalwith amplified output

Overview
The Kipp & Zonen SMP3-A is a smart pyranometer for industrial and meteorological applications, providing amplified analogue and digital outputs with low maintenance requirements. Based on CMP3 technology, the SMP3 adds a Modbus® interface, improved response time and temperature-corrected measurements. Its wide supply range (5–30 VDC) and protection against over-voltage, reverse polarity and short circuits simplify integration into measurement stations. Identical sensitivity and connections across units enable quick replacement during recalibration.

Benefits

• ISO / IEC classification: Spectrally Flat Class C (ISO 9060) with ISO / IEC 17025 calibration.
• Low maintenance: internal drying cartridge — no replacement needed for 10 years; 5-year warranty and high MTBF.
• Smart outputs and low power: Modbus RTU (2-wire RS-485) plus analogue outputs (4–20 mA), temperature correction and minimal post-recalibration adjustments.

Technical specifications

• Non‑stability: < ±1% (change/year)
• Drying cartridge & maintenance: internal, no replacement necessary
• Zero offset B: < ±5 W/m²
• Operating humidity: 0 to 100 %
• Irradiance saturation: 2000 W/m² (max)
• Enclosure material: aluminium, anodised
• Digital outputs: Modbus RTU 2‑wire RS‑485
• Weight: 300 g (0.7 lb)
• Non-linearity: < ±3% (0 to 100 W/m²)
• Directional response: < 20 W/m² (up to 80° with 1000 W/m² beam)
• Zero offset A: < ±15 W/m²
• Spectral range / accuracy: 300 to 2800 nm
• Ingress protection: IP67
• Classification: Spectrally Flat Class C (ISO 9060:2018)
• Temperature correction: < ±3% (-20 to +50 °C)
• Operating temperature range: -40 to +70 °C
• Response time: < 1.5 s (63%), < 12 s (95%)
• Analogue outputs: 0 to 1 V (V-model) or 4 to 20 mA (A-model)
• Cable lengths available: 10, 25, 50, 100 m
• Sensitivity: N.A.