LSI LASTEM INSTUM 05328 Direct Radiometer Heliophanometer User Manual

Environmental monitoring solutions Direct radiometer
Heliophanometer
User manual

Revisions list

About this manual

The information contained in this manual may be changed without prior notification. No part of this manual may be reproduced, neither electronically nor mechanically, under any circumstance, without the prior written permission of LSI LASTEM.
LSI LASTEM reserves the right to carry out changes to this product without timely updating of this document.
Copyright 2023 LSI LASTEM. All rights reserved.

Introduction

The LSI LASTEM direct radiometer and heliophanometer is a sensor for measuring radiation coming directly from the sun and sunshine duration (referring to a certain threshold). Measurement is at visible and near infrared wavelength, with performances of a WMO II class pyranometer.
Being set the measurement site latitude, the instrument does not require any other seasonal repositioning for an ordinary precision relief. Higher precision are obtained with two seasonal repositioning only.
The sensor furnishes sunshine state: sun is “present” when the direct radiation is greater than 120 Wm -2 (WMO standard – 1981).
Sensor has two heaters: one for atmospheric moisture and the other for frost. In darkness, the rotating band is stopped and the logic output for sunshine presence is switched to “off”. Normalized outputs let the instrument compatible with the most part of other instrument: data logger, printer, timer.
1.1 Principle of measurement
The sensitive element is made up of a radiation sensing sphere, which receives radiation from an anular sky portion of an amplitude of 90°. A rotating band shadows the sensing sphere as it passes behind the sun: the difference of radiation values in the opposite condition (shadow – light) is, with a good approximation, the direct sunshine radiation.

Technical specifications

| DPD504.1
---|---
Direct radiation| Measurements| • Direct radiation
• Sunshine status
Principle| Non-tracking sensor
Sensitive element| Photodiode
Spectral range| 300÷1100 nm
Measuring range| 0÷1500 Wm -2
Accuracy| 15% (daily totals)
Non linearity| < 1.5%
Thermic drift| < 2% (-10÷40 °C)
Output| 4÷20 mA
Sunshine duration| Threshold| 120 Wm-2  of direct radiation
Accuracy| < 0.1 h (in clear sky)
Output| ON / OFF TTL 0÷5 V
General information| Power supply| 10÷14 Vdc
Power consumption| • Sensor: 0.7 W
• Anti-condensation heater: 1 W
• Defrosting heater: 20 W
Operative temperature| 0÷60 °C (-30÷60 °C with heating)
Rotating band speed| 1 rps
Operating latitude| 0÷60 °
Mounting| For Ø 45÷65 mm pole using DYA041 arm and DYA049 collar
Recalibration| Every 2 years
Protection grade| IP66
Weight| 1.5 kg
EMC| EN 61326-1:2013
Actuation time| Always ON recommended (in any case > 2 min)
Data logger compatibility| • M-Log (ELO008)
• R-Log (ELR515.1)
• E-Log
• Alpha-Log (using ALIEM module)

Report of Calibration

Each sensor is supplied with a Calibration Report produced by comparison, under the sun with a certified pyrheliometer.
The Calibration Report reports the measurement of direct radiation at zero and under the sun.
It is not necessary to re-calibrate the instrument frequently. However, it is recommended to do it every 2 years.
Example of Report of Calibration of DPD504.1.

Installation

The sensor must be installed away from buildings, trees and other obstacles that may generate shadows or  improper light diffusion in each day time and for every day of the year.
4.1 General safety rules
Please read the following general safety rules in order to avoid injuries to people and prevent damages to the product or to possible other products connected with it. In order to avoid any damages, use this product exclusively according to the instructions herein contained.
The installation and maintenance procedures must be carried-out only by authorized and skilled service personnel.
Power the instrument in a suitable manner. Pay attention and observe the power supplies like indicated for the model in your possession.
Carry-out all connections in a suitable manner. Pay strict attention to the connection diagrams supplied with the instrument.
Do not use the product in case of suspected malfunctions. In case of suspected malfunction, do not power the instrument and contact authorized technical support immediately.
Before you carry-out any operation on electrical connections, power supply system, sensors and communication apparatus:

• Disconnect the power supply.
• Discharge the accumulated electrostatic discharges touching an earthed conductor or apparatus.

For safety regulations please refer to manual INSTUM_05290.
4.2 Mechanical installation
The sensor must be installed with the red nose pointing in the direction of the equator, in an unshaded place all day in any season. Preferably place the sensor at a height of 2 m above a grassy ground. Installation can take place on a pole using the DYA049 collar and DYA041 support. Proceed as indicated:

1. Fix the DYA041 support to the DYA049 collar and mount them on pole.
   

2. Turn the support until it points to the terrestrial equator.

3. Mount the sensor on DYA041 support.

4. Using the notch on the support as a reference, tilt the sensor up to an angle corresponding to the latitude of the site, then tighten the fixing screw.

5. Connect the DWA5nnA cable to the sensor.

4.3 Modes of operation
The sensor is endowed with heating for atmospheric moisture and with a no frost system in order to prevent frost forming on the glass dome. By default setting no frost system is ON, while the heating is OFF. In order to change this configuration, operate on instrument electronic board as described in the picture below. For optimal operation, LSI LASTEM recommends keeping the power supply permanent in order to allow the heaters to be more efficient.
If not allowed by the power supply system, however, maintain an actuation time greater than two minutes.
4.4 Electrical connection
Wiring connections must be performed as following:

Read also ANNEX 1.
4.5 Calibration factor
Measurement obtained by the sensor signal output, in voltage or in current depending on the model, must be multiplied, on the data acquisition system, by the Calibration factor, this is to obtain the most accurate radiation value results.
Example

Wm-2

4.6 Use with LSI LASTEM data logger
If the sensor is used with an LSI LASTEM data logger, proceed with the configuration of the data logger using the 3DOM software:
➢ Open the data logger configuration.
➢ Add the sensor by selecting its code (DPD504.1) from the 3DOM Sensor Library.
➢ Check the acquisition parameters (input, rate, etc.)
➢ Save the configuration and send it to the data logger.
For more information about the configuration, refer to the manual of the data logger in use.

Operational check

The sensor is equipped with a rotating band. Check that, in the presence of solar radiation, it rotates around the small sphere positioned in the center of the sensor.
To check the sensor output it is necessary to have the accompanying drawing (read ANNEX 1) of the sensor and a multimeter.
To check the direct radiation output, proceed as follows:

1. Set the multimeter to measure signals in direct current (DCA) and 20 mA scale.
2. Disconnect the wire corresponding to the negative signal (- Sig) and connect it to the red test lead (+) of the multimeter. The black test lead (-) fix it in place of the disconnected wire.
3. Darken the sensor with a black cloth; the multimeter should measure approximately 4 mA.
4. With the sensor exposed to the solar radiation the multimeter should measure a value greater than 4 mA.

The radiation measurement value can be compared with other radiometers installed in the same system as long as they are of the same model.
The procedure for verifying the ON/OFF TTL output of the heliophane is the same for all sensors.

1. Set the multimeter to measure signals in direct voltage (DC) and 5 V scale.
2. Connect the red test lead (+) of the multimeter to the red wire (signal output 2) and the black test lead (-) to the grey wire (common output).
3.  Darken the sensor with a black cloth; the multimeter should measure approximately 0 V (state OFF).
4. With the sensor exposed to solar radiation greater than a 120 Wm -2 the multimeter should measure approximately 5 V.

Maintenance

The sensor requires no special maintenance, just wiping with a damp cloth to keep the glass dome clean. It  is also advisable to check:
➢ the integrity of the sensor
➢ the inclination of the sensor which must correspond to the latitude of the place
For calibration, refer to §3.

Handling

Avoid the introduction of electrostatic discharge (ESD). The product, or part of it, is fragile, avoid mechanical shocks, abrasions or scratches on the surface and dome.

Storage, packaging, preservation, delivery

For storage, respect the humidity (10÷100% non-condensing) and temperature (-40÷80 °C) limits. Avoid direct sun exposure.
For delivery and storage, use the packaging supplied with the product.
For preservation, it is recommended to respect the environmental limits of humidity (15÷80% noncondensing) and temperature (-10÷50 °C).
Upon receipt of the material, visually check the package for signs of crushing or perforation; in the presence of these signs, check the integrity of the product inside.

Disposal

This product is a device with high electronic content. In accordance with the standards of environmental protection and collection, LSI LASTEM recommends handling the product as waste of electrical and electronic equipment (RAEE). For this reason, at the end of its life, the instrument must be kept apart from other wastes.
**** LSI LASTEM is liable for the compliance of the production, sales and disposal lines of this product, safeguarding the rights of the consumer. Unauthorized disposal of this product will be punished by the law.
Recycle or dispose of the packaging material according to local regulations.

Accessories and spare parts

How to contact LSI LASTEM

In case of problem contact the technical support of LSI LASTEM sending an e-mail to support@lsi-lastem.com, or compiling the technical support request module at www.lsi- lastem.com.
For further information refer to addresses and numbers below:

• Phone number +39 02 95.414.1 (switchboard)
• Address: Via ex S.P. 161 – Dosso n. 9 – 20049 Settala Premenugo, Milano
• Web site: www.lsi-lastem.com
• Commercial service: info@lsi-lastem.com
• After-sales service: support@lsi-lastem.com, Repairs: riparazioni@lsi-lastem.com

EC Declaration of Conformity

ANNEX 1

13.1 DPD504.1 sensor schematic drawing

LSI LASTEM SRL
INSTUM_05328

References

• lastem.com
• Environmental Monitoring Solutions - LSI LASTEM
• Environmental Monitoring Solutions - LSI LASTEM

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>