MS-57 Pyrheliometer
Key Benefits
- NMI-traceable individual calibration for maximum measurement confidence
- Ultra-fast response time — less than 1 second for dynamic tracking applications
- Broad spectral range (200–4000 nm) capturing the full solar spectrum
- Designed for long-term unattended solar tracker deployment
- Thermopile detector with high sensitivity and low zero offset
- Compatible with EKO STR-series two-axis solar trackers
Primary Specifications
Direct Normal Irradiance Explained
Direct Normal Irradiance (DNI) is the component of solar radiation received from the direct beam of the sun, measured on a surface perpendicular to the sun's rays. It is the critical parameter for:
- Concentrated Solar Power (CSP) plant design and performance
- Separation of GHI into direct and diffuse components
- Solar resource assessment for high-value energy projects
- Climate monitoring and aerosol optical depth studies
- WMO Baseline Surface Radiation Network (BSRN) stations
Tracker Required
A pyrheliometer must be continuously pointed at the centre of the solar disc to measure DNI accurately. The MS-57 is designed for use with EKO's STR-21G two-axis solar tracker or equivalent precision tracking systems.
Full Feature Set
- Full solar spectrum coverage — 200 to 4000 nm spectral range
- Individual NMI-traceable calibration certificate supplied with each unit
- Sub-second response time supports dynamic solar tracking applications
- High sensitivity thermopile detector with low zero offset
- Precision collimator tube with correct 5° opening half-angle (WMO standard)
- Desiccant cartridge protects detector from humidity ingress
- Analogue millivolt output compatible with standard dataloggers
- Robust stainless steel and anodized aluminium construction
- Designed for continuous outdoor deployment with minimal maintenance
- Recalibration service available through EKO calibration laboratory
Where the MS-57 Is Used
The MS-57 is the instrument of choice wherever the highest DNI measurement accuracy is required.
Part of a Complete Solar Measurement System
Combine the MS-57 with the EKO MS-80 pyranometer and STR-21G solar tracker to build a full GHI / DNI / DHI measurement station — providing all three irradiance components needed for comprehensive solar resource characterization.
Measure Direct Normal Irradiance with Confidence
Contact us to request a quote, discuss NMI-traceable calibration requirements, or explore how the MS-57 fits into your solar monitoring station.