ES4 – SDI-12 Digital Pyranometer

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The ES4 is a digital sensor with SDI-12 communication protocol.

The sensor incorporates a silicon-cell photodiode with a rugged, self-cleaning sensor housing design, and high-quality cable and M-12 connector for easy connection to Delta-T Devices SDI-12 networks.

Typical applications include shortwave radiation measurement in agricultural, ecological, and hydrological weather networks. It can also used to optimize photovoltaic systems.

Sensor includes IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement for maintenance and recalibration.



ISO 9060:2018 Class C (fast response)
Input Voltage Requirement 5.5 to 24 V DC
Current Drain 1.5 mA (quiescent), 1.9 mA (active)
Output Range 0 to 2000 W mˉ²
Calibration Uncertainty at 1000 W mˉ² Less than 3%
Measurement Repeatability Less than 1 %
Non-stability (Long-term Drift) Less than 2 % per year
Non-linearity Less than 1 % (up to 2000 W mˉ²)
Response Time 0.6 s, time for detector signal to reach 95 % following a step change, fastest data transmission rate for SDI-12 circuitry is 1 s
Field of View 180˚
Spectral Range 360 to 1120 nm (wavelengths where response is 10 % of maximum)
Directional (Cosine) Response ± 5 % at 75˚ zenith angle
Temperature Response 0.04 ± 0.4 % per C
Operating Environment -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Dimensions 30.5 mm diameter, 37 mm height
Mass (with 5 m of cable) 140 g



Main components and software

Mountings and enclosures

Installation accessories

Cables and networks

Remote communications

Spares and consumables

Power options


Product Resources

Data Sheets



Technical Notes