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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.
Specification
| 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 |
