SMP21 Smart Pyranometer

Quick Overview

The SMP21 Pyranometer is a secondary standard pyranometer with an amplified analogue and RS485 Modbus RTU output. The SMP21 is identical to the CMP21 pyranometer but includes a Modbus interface allowing for an improved response time and rescaleable, temperature corrected measurement data. The amplified output options are 0-1V or 4-20mA and these are identically configured to allow for easy installation and exchange during recalibration. The SMP21 has two, 2mm thick, high quality concentric domes which reduces directional error and improves thermal isolation. The SMP21 has an internal 10K thermistor, or PT100, sensor to monitor the housing temperature, along with individual temperature and direction response values for post-processing of recorded data. The SMP21 also has a refillable desiccant chamber. Spectral range of 285 to 2800nm. The SMP21 is an ideal choice for scientific use and in top level solar radiation monitoring networks, such as the World Meteorological Organisation and the ability to switch units without any adjustment is a big advantage.

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Details

The SMP21 is a secondard standard pyranometer that combines the sensor technology of the CMP21 with the added benefits of the both a RS485 Modbus interface and a standardised analogue output. The SMP21 uses a 32-junction thermopile sensing element under two, 2mm thick, high quality concentric domes which reduces directional error and improves thermal isolation. The housing include a screw-in drying cartridge that can simply be removed using a coin. This allows the desiccant to be replaced on site without the need for specialist equiment. Convenient desiccant refill packets are available to make this process as simple as possible.

The housing design of the SMP 21 is designed with a sensor to monitor the housing temperature and the SMP 21 uses a passive temperature compensation circuit with a standardised linear function to allow for individual temperature compensation. Each instrument is supplied with its own individual temperature and directional response data for improved post processing of recorded data. This individualised data is the reason the SMP21 is the choice for scientific use and in top level solar radiation monitoring networks such as the Baseline Surface Radiation Network (BSRN) and Global Atmospheric Watch (GAW) of the World Meteorological Organisation (WMO).

The SMP21 come with a 0-1V or 4-20mA analogue output and these can be rescaled by the user with the supplied PC software. The units are configured with the 0-1V output set as -200 to 2,000Wm² and the 4-20mA output as a 0-1,600Wm². Negative ranges are provided to allow the sensor to show levels at night when there is heat emitted from the sensor. All SMP's have the RS485 Modbus RTU interface, very low power requirements and are supplied with comprehensive, traceable, calibration certificates. Calibrations are traceable to the World Radiometric Reference (WRR) in Davos Switzerland and are performed in accordance with ISO 9847, Annex A.3 'Calibration of Field Pyranometers by comparison to a Reference Pyranometer'.

Diagram

SMP 21 Diagram

Specification

ISO 9060:1990 Classification	Secondary Standard
Spectral Range	285 to 2800nm
Response Time	<2s
Zero Offset A	<7 W/m²
Zero Offset B	<2 W/m²
Directional Error	<10 W/m² (Up to 80º with 1000 W/m² beam)
Temperature Dependence of Sensitivity	<0.3% (-20 to 50°C) <0.3% (-40 to 70°C)
Analogue Output	-V version: 0-1V -A version: 4-20mA
Analogue Output Range	-V version: -200 to 2000W/m² -A version: 0 to 1600W/m²
Digital Output	2 wire RS485 Modbus RTU
Digital Output Range	-400 to 4000W/m²
Operating Temperature	-40 to +80°C
Supply Voltage	5 to 30vDC
Power Consumption (at 12vDC)	-V version: 55mW -A version: 100mW
Ingress Protection	IP67

SMP21 instruments have an 8-pin socket and can be connected to a standard cable with a pre-wired waterproof 8 pin plug and flying leads. Cable lengths of 10m, 25m, 50m and 100m are available.

Availability: Stock Item

Components / Downloads

For further information, technical advice, or a quotation please call or email us. If you are not sure which product you need one of our technical sales advisors will be happy to discuss your application. We also accept company purchase orders by fax or post. Credit card orders can also be placed over the phone for any product.

REF	DESCRIPTION	PRICE	ORDER ITEM

SMP21-V Smart Pyranometer with 0-1vDC output
0374930-100	SMP21 Smart Pyranometer with a configurable 0-1vDC output. Secondary standard pyranometer with a 32-junction thermopile sensing element under two, 2mm thick, high quality concentric domes. Integrated leveling. Sun shield. Spectral range 285 - 2800nm, response time less than 2 sec (95%), Operating temperature -40 to +80°C. Thermopile detector. 2 wire RS485 Modbus and 0-1V output. Analogue output range -200 to 4,000W/m², Digital output range -400 to 4,000W/m². Power Supply 5 to 30vDC. Supplied with no plug or cable.	£2,555.00	or call us for a quote
0374930-102	SMP21 Smart Pyranometer with a configurable 0-1vDC output. Secondary standard pyranometer with a 32-junction thermopile sensing element under two, 2mm thick, high quality concentric domes. Integrated leveling. Sun shield. Spectral range 285 - 2800nm, response time less than 2 sec (95%), Operating temperature -40 to +80°C. Thermopile detector. 2 wire RS485 Modbus and 0-1V output. Analogue output range -200 to 4,000W/m², Digital output range -400 to 4,000W/m². Power Supply 5 to 30vDC. Supplied with waterproof 8-pin plug connector with 10m of pre-wired yellow signal cable.	£2,645.00	or call us for a quote

SMP21-A Smart Pyranometer with 4-20mA output
0374930-200	SMP21 Smart Pyranometer with a configurable 4-20mA output. Secondary standard pyranometer with a 32-junction thermopile sensing element under two, 2mm thick, high quality concentric domes. Integrated leveling. Sun shield. Spectral range 285 - 2800nm, response time less than 2 sec (95%), Operating temperature -40 to +80°C. Thermopile detector. 2 wire RS485 Modbus and 4-20mA output. Analogue output range 0 to 1,600W/m², Digital output range -400 to 4,000W/m². Power Supply 5 to 30vDC. Supplied with no plug or cable.	£2,555.00	or call us for a quote
0374930-202	SMP21 Smart Pyranometer with a configurable 4-20mA output. Secondary standard pyranometer with a 32-junction thermopile sensing element under two, 2mm thick, high quality concentric domes. Integrated leveling. Sun shield. Spectral range 285 - 2800nm, response time less than 2 sec (95%), Operating temperature -40 to +80°C. Thermopile detector. 2 wire RS485 Modbus and 4-20mA output. Analogue output range 0 to 1,600W/m², Digital output range -400 to 4,000W/m². Power Supply 5 to 30vDC. Supplied with waterproof 8-pin plug connector with 10m of pre-wired yellow signal cable.	£2,645.00	or call us for a quote

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SMP21 Smart Pyranometer

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SMP21 Smart Pyranometer

Quick Overview

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