Analog Class A & B pyrheliometers

DR20-A1 & DR15-A1 Analog Class A & B pyrheliometers with heating DR20-A1 and DR15-A1 are high-accuracy, direct (normal incidence) solar radiation sensors, also known as pyrheliometers. DR20-A1 complies with Class A and DR15-A1 with Class B specifications of the ISO 9060:2018 standard. These instruments are designed for tracker-mounted operation and offer analog millivolt outputs. Both pyrheliometers have superior window heating that leads to high data availability by mitigating dew and frost. Hukx’s DR15-A1 pyrheliometer is an ISO 9060 spectrally flat Class B instrument and replaces the older...

Heated for high data availability High data availability is attained by heating the front window, which suppresses dew and frost deposition at a very low power consumption. DR20-A1 and DR15-A1 only require 1 W to keep their window free from dew and frost. Liabilities covered: test certificates As required by ISO 9060 for Class A classification, each DR20-A1 is supplied with test results for the individual instrument: – sensitivity – response time – temperature response DR15-A1 certificates include sensitivity and response time only. DR20-A1 and DR15-A1 use A pyrheliometer is designed for tracker-mounted...

– solar energy surveys – solar resource assessments – meteorological networks – sites with dew and frost issues – DR30-D1 digital pyrheliometer with heating, internal tilt sensor, and humidity measurement – View our complete product range of sensors. Uncertainty evaluation The uncertainty of a measurement under outdoor conditions depends on many factors. Guidelines for uncertainty evaluation (according to the “Guide to Expression of Uncertainty in Measurement” or GUM) can be found in our manuals. We provide spreadsheets to assist you in evaluating the uncertainty of your measurements. Figure...

Figure 6 The offset of the latest models DR20-A1, DR15-A1 (and also the digital DR30-D1) when heating is significantly improved compared to the older DR01, DR02, and DR03 models. DR20-A1 and DR15-A1 have a 12 VDC, 1 W heater, which produces a negligible offset. The older models had offsets of the order of 1 W/m2 at the same heating level. In addition, the temperature of the front window of DR20-A1 and DR15-A1 is 4 times higher than that of the older models, at the same heating power. Figure 7 Comparison of the measured data with and without heating on a typical winter morning using model DR30-D1,...

General specifications measurand ISO classification calibration uncertainty response time (95 %) full field of view angle slope angle zero offset a (5 K/hr) calibration traceability analog output direct solar radiation spectrally flat pyrheliometer DR20-A1: Class A DR15-A1: Class B spectral range rated operating temperature range temperature response calibration certificate temperature response test of individual instrument standard cable length with correction in data processing:

About Hukx Hukx is the leading innovator in solar radiation and heat flux sensor technology. We are proud to set the standard in high-accuracy measurement, and to be working at the heart of the energy transition. Customers worldwide rely on our bestselling pyranometers, pyrheliometers, and heat flux sensors. From sensor design and selection to supply and recalibration, we support you across the entire lifecycle. Hukx is headquartered in the Netherlands, with locally owned representative sales offices in the USA, Brazil, India, China, Southeast Asia, and Japan. Let us help you select the best...