Instrument Expert
Original factory packaging
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Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User's Manual Technical Drawing
The SI-4HR infrared radiometer is developed for road weather networks specifically, with a 10° vertical field of view, allowing for remote detection of a narrow and distant target roadway. The rectangular-shaped aperture maximizes the horizontal field of view allowing for a larger integrated measurement without including undesired target areas such as sky or surrounding terrain. The elongated external shield is designed to better protect from snow and ice building up on the sensor. The SI-4HR has an SDI-12 digital output and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. The sensor has a response time of 0.6 seconds. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.
SI-4HR Drawing
| Input Voltage Requirement | 5.5 to 24 V DC |
| Current Draw | 1.5 mA (quiescent), 2.0 mA (active) |
| Calibration Uncertainty (-30 to 65 C), when target and detector temperature are within 20 C | 0.3 C |
| Calibration Uncertainty (-40 to 80 C), when target and detector temperature are different by more than 20 C | 0.5 C |
| Measurement Repeatability | Less than 0.05 C |
| Stability (Long-term Drift) | Less than 2 % change in slope per year when germanium filter is maintained in a clean condition |
| 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 | 5° vertical half angle; 16° horizontal half angle |
| Spectral Range) | 8 to 14 μm; atmospheric windown |
| Operating Environment | -50 to 80 C; 0 to 100 % relative humidity (non-condensing) |
| Dimensions | 23 mm diameter, 60 mm length |
| Mass | 219 g (with 5m of lead wire) |
| Cable | 5 m of four conductor, shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions), aditional cable available |
| Warranty | 4 years against defects in materials and workmanship |
| Manufactured | Made in the USA |
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