DR01 specifications:
ISO classification First Class
Spectral Range 200 - 4000 nm
Response Time (95%) 18s
Full opening view angle 5 degrees
Slope angle 1 degree
Irradiance range 0 to 2000 W/m2
Sensitivity (nominal) 10 μV/ Wm-2
Temperature range -40 - +80 °C
Temperature dependence < 0.1%/°C
Non stability (drift) < 1% per year
Calibration traceability WRR
Cable length 5 standard (longer lengths optional)
Figure 1: DR01 pyrheliometer: (1) protection cap, (2) window with heater, (3) sight, (5) sensor, (7) humidity indicator, (10) cable for heater
Figure 2: DR01 dimensions

The DR01 is a research grade normal incidence direct solar irradiance sensor (also known as a pyrheliometer). Suitable for tracker mounted operation, the DR01 is intended for short-wave direct solar irradiance measurement of the sun. The DR01 is a "First Class" compliant pyrheliometer, as per the latest ISO and WMO standards.

A nice clear print of the original product brochure.


The DR01 foreoptic assembly features a precision ground and polished quartz window/lens, for true spectral solar transmission ranging from 0.2 - 4.0 μm. As per the latest ISO-9060 and WMO standards, the full opening view angle of the DR01 is collimated precisely to 5.0 degrees, making the sensor ideally suited for normal incidence direct solar irradiance measurement.
Capable of measuring up to two suns, 2000 W/m2, the DR01 pyrheliometer can be deployed anywhere on earth. The instrument employs a passive thermopile-based sensing technology that generates a low level DC millivolt output signal proportional to the normal incident direct solar flux received at the detector surface. The DR01 also features a thermally isolated low power window/lens heater in the foreoptic; when cycled on/off prior to sunrise the heater effectively eliminates the formation of dew on the pyrheliometer window/lens, thus resulting in improved post sunrise early morning measurement accuracy.
Determining direct solar irradiance with the DR01 requires connection to a data acquisition device with a measurement resolution of ten micro-volts or better, and an autonomous two-axis solar tracker platform. Typical DR01 measurement applications include scientific meteorological/climate observations, material testing research, solar collector/PV panel efficiency and solar renewable resource assessment. The signal cable of the DR01 can be easily replaced by the user onsite, thus minimizing down-time and expense otherwise associated with instrument re-cabling and/or cable connector replacement by the manufacturer. Each DR01 is calibrated upon manufacture and delivered standard with a WRR (World Radiometric Reference) traceable certificate of calibration.

Suggested Use

  • climatology / meteorology
  • material testing research
  • solar collector and PV panel efficiency validation
  • solar renewable resource assessment

More Information

Optional: extended cable, AC100 / AC420 amplifiers.
Various tracking solutions can be offered by Hukseflux

Version 0814