First-class pyranometer RSG1

µV, 0÷2Vdc, 4÷20mA, RS485/Modbus | 0 ÷ 2000 W/m² | 0.3 ÷ 3 µm | Class B (ISO 9060) | 255 x 162mm | IP67

Manufacturer: Nesa
Category: Meteorology – Climatology, Solar radiation - Light, SENSORS

The NESA RSG1 is a first-class thermopile pyranometer (class B according to ISO 9060) for measuring global solar radiation between 0.3 and 3 µm using the cosine law. It is WMO compliant for environmental monitoring and suitable for photovoltaic applications according to IEC 9060 and IEC 17025.

Measurement range from 0 to 2000 W/m², typical sensitivity of 10 µV/(W/m²), zero offset < 14 W/m², response time < 20 seconds, expected daily uncertainty < 5%. Double quartz glass dome (K5), IP67 aluminum housing, and natural output in µV, 0÷2Vdc, 4÷20mA or RS485 / Modbus.

Key points

First class (class B) according to ISO 9060; compliant with WMO
0 ÷ 2000 W/m², 0.3 ÷ 3 µm, 10 µV/(W/m²)
Zero offset < 14 W/m² (at 200 W/m²), stability < ±1.5% per year, non-linearity < ±1%
Outputs µV, 0÷2Vdc, 4÷20mA or RS485 / Modbus (ID 003)
Anodized aluminum, IP67, -40 ÷ +80 °C, < 630 g

Technical Frequently Asked Questions

What outputs does the RSG1 pyranometer have?

RSG1-N: natural thermopile, 10 µV/(W/m²). RSG1-A: 0÷2Vdc = 0…2000 W/m². RSG1-B: 4÷20mA = 0…2000 W/m², not powered by the loop. RSG1-C: RS485 / Modbus RTU (9600 baud, N, 8, 1; function 0x03; registers 40002 – 40003; standard ID 003).

What makes the RSG1 different?

It is first class: zero offset < 14 W/m², stability < ±1.5% per year, non-linearity < ±1% and expected daily uncertainty < 5%, with double quartz glass dome (K5).

How do I order it?

Sensor (RSG1), output (A, B, C or N), sensor-datalogger cable (05, 10 or xx, length in meters to be specified) and support (SS1 of l = 500 mm, SS2 of l = 900 mm or SS3 of l = 1500 mm). Manufacturer's example: RSG1 A 10 SS2.

Properties

Feature	Specification
Measurement and operating principle
Measured magnitude	Global solar radiation (cosine law)
Measurement range	0 ÷ 2000 W/m²
Spectral range	0.3 µm ÷ 3 µm (AM1.5G)
Typical sensitivity	10 µV/(W/m²) over 2π sr
Typical output constant	10 mV/(kW/m²)
Resolution	< 4 W/m²
Response time	< 20 s
Zero offset	< 14 W/m² (at 200 W/m²); < ±3 W/m² (ΔT = 5 K/h)
Long-term stability (1 year)	< ±1.5%
Cosine response	< ±16 W/m²
Temperature response (ΔT 50 K)	< 4%
Nonlinearity	< ±1 %
Response to tilt (0 – 90°)	< ±2%
Expected daily uncertainty	< 5%
Transducer	Thermopyle
Classification	First class (class B according to ISO 9060)
Regulatory compliance	ISO 9060; WMO; CE
Output signals and interface
Output (version N)	10 µV/(W/m²), direct from thermopile
Output (version A)	0÷2Vdc = 0…2000 W/m²
Output (version B)	4÷20mA = 0…2000 W/m², not powered by the loop
Output (version C)	RS485 / Modbus RTU (Half duplex); Standard ID 003; 9600 baud, N, 8, 1; Function 0x03; Registers 40002 – 40003 (IEEE754 32 bits)
Output impedance	< 40 Ω
Calibration	By comparison with a primary standard instrument of superior class and known constant
Power supply, environment, and mechanical data
Food and consumption	Self-powered in the N version; 10 ÷ 30Vdc < 0.1 W in the others
Protections	Protection against short circuits and lightning strikes
Operating conditions	-40 to +80 °C
Degree of protection	IP67
Material	Anodized aluminum and stainless steel screws
Dimensions	255 x 162 mm (see drawing)
Weight	< 630 g

Reference	Configuration
RSG1-ARSG1A	Model: RSG1 · Output signal: 0÷2Vdc · Supplied with: Calibration report
RSG1-BRSG1B	Model: RSG1 · Output signal: 4÷20mA · Supplied with: Calibration report
RSG1-CRSG1C	Model: RSG1 · Output signal: RS485 / Modbus (Standard ID 003) · Supplied with: Calibration report
RSG1-NRSG1N	Model: RSG1 · Output signal: Natural in µV (10 µV/(W/m²)) · Supply: With calibration report