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Summary of Contents for GHM Delta OHM LPPIRG01
- Page 1 English Operating manual Pyrgeometer LPPIRG01 Companies / Brands of GHM www.deltaohm.com Keep for future reference.
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Page 2: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ....................3 WORKING PRINCIPLE ................... 4 INSTALLATION ..................... 6 ELECTRICAL CONNECTIONS .................. 9 LPPIRG01 ..................9 CONNECTIONS LPPIRG01S .................. 10 CONNECTIONS MEASUREMENT IN THE MODEL WITH ANALOG OUTPUT ........11 RS485 MODBUS-RTU OUTPUT ................13 ............... 13 ETTING THE COMMUNICATION PARAMETERS -RTU .......... -
Page 3: Introduction
INTRODUCTION LPPIRG01 pyrgeometer measures the far infrared radiation (FIR). The measures are referred to radiations with wavelength greater than 4.5 µm. The far infrared radiation derives from the measure of the thermopile output signal and from the knowledge of the instrument temperature. The temperature is measured with a 10 kΩ... -
Page 4: Working Principle
2 WORKING PRINCIPLE LPPIRG01 pyrgeometer is based on a thermopile sensor. The thermopile sensitive sur- face is coated with a black matt paint, which allows the pyrgeometer not to be selective at different wavelengths. The sensor is covered by a silicon window that has two basic purposes: 1. - Page 5 ↓ = E + σT term Where: = net radiation (positive or negative) measured by the thermopile (W m term σ = Stefan-Boltzmann constant (5.6704 x 10 = pyrgeometer temperature (K), obtained by the reading of the NTC resistance (see table 5.1).
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Page 6: Installation
3 INSTALLATION Before installing the pyrgeometer, refill the cartridge containing silica-gel crystals. Sil- ica-gel absorbs humidity inside the instrument and prevents, in particular climatic con- ditions, condensation on the internal surface of the silicon window and measurement alteration. Do not touch the silica gel crystals with your hands while refilling the cartridge. Carry out the following instructions in an environment as drier as possible: 1. - Page 7 • The pyrgeometer must be mounted in an easy-to-reach location in order to clean the silicon window regularly. At the same time, make sure that no buildings, construc- tions, trees or obstructions exceed the horizontal plane where the pyrgeometer lies. If this is not possible, select a site where obstructions do not exceed 10°.
- Page 8 Fig. 3.3: fixing accessories LPPIRG01 V2.1...
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Page 9: Electrical Connections
4 ELECTRICAL CONNECTIONS The pyrgeometer has a 8-pole connector and uses the CPM12AA8PG... (LPPIRG01) or CPM12-8D... (LPPIRG01S) optional cables in UV resistant PTFE, with 8-pole connector on one side and open wires on the other side. The metallic housing of the pyrgeometer should preferably be grounded ( ) locally. -
Page 10: Lppirg01S Connections
4.2 LPPIRG01S CONNECTIONS The pyrgeometer LPPIRG01S has RS485 Modbus-RTU output and requires 5…30 Vdc external power supply. It is to be connected to a power supply and to a PLC, a data logger or a RS485/USB or RS485/RS232 converter for PC as shown in fig. 4.2. The RS485 output is not isolated. -
Page 11: Measurement In The Model With Analog Output
5 MEASUREMENT IN THE MODEL WITH ANALOG OUTPUT Measure the NTC resistance R (Ω) and calculate the pyrgeometer temperature T by using the formula 3: = a + b log(R ) + c log(R Where: a = 10297.2 x 10 b = 2390.6 x 10 c = 1.5677 x 10 The temperature is expressed in Kelvin. - Page 12 Once the pyrgeometer temperature T in Kelvin and the thermopile output signal U in µV (measured with a multimeter) are known, irradiation E ↓ (W m ) is obtained from the formula 4: ↓ = + σT Where: σ = Stefan-Boltzmann constant (5.6704 x 10 = sensitivity of the instrument expressed in µV/(Wm ) and shown in the label on the pyrgeometer (and in the calibration report).
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Page 13: Rs485 Modbus-Rtu Output
6 RS485 MODBUS-RTU OUTPUT Before connecting the pyrgeometer to the RS485 network, an address must be assigned and the communication parameters must be set, if different from the factory preset. 6.1 S ETTING THE COMMUNICATION PARAMETERS Connect the pyrgeometer to the PC in one of the following two ways: A. - Page 14 4. Within 10 seconds from the pyrgeometer power on, send the @ command and press Enter. Note: if the pyrgeometer does not receive the @ command within 10 seconds from power on, the RS485 MODBUS mode is automatically activated. In such a case, it is necessary to switch off and on again the pyrgeometer.
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Page 15: Reading The Measures With The Modbus -Rtu Protocol
6.2 R -RTU EADING THE MEASURES WITH THE ODBUS PROTOCOL In MODBUS mode, you can read the values measured by the pyrgeometer through the function code 04h (Read Input Registers). The following table lists the quantities avail- able with the appropriate register address: Number Address Quantity... -
Page 16: Maintenance
7 MAINTENANCE In order to grant measurements high accuracy, it is important to keep the silicon win- dow clean. Consequently, the more the dome will be kept clean, the more measure- ments will be accurate. You can wash it using water and standard papers for lens. If necessary, use pure ETHYL alcohol. -
Page 17: Technical Specifications
8 TECHNICAL SPECIFICATIONS Sensor Thermopile Typical sensitivity 5÷10 µV/Wm Impedance 33÷45 Ω Measuring range -300÷+300 W/m Viewing angle 160° Spectral range (50%) 5.5÷45 µm (transmission of the silicon window) Operating temperature -40÷80 °C Output Analog in µV/Wm (LPPIRG01) Digital RS485 Modbus-RTU (LPPIRG01S) Power supply 5÷30 Vdc (LPPIRG01S) Connection... -
Page 18: Safety Instructions
9 SAFETY INSTRUCTIONS General safety instructions The instrument has been manufactured and tested in accordance with the safety stand- ard EN61010-1:2010 “Safety requirements for electrical equipment for measurement, control and laboratory use” and has left the factory in perfect safety technical condi- tions. -
Page 19: Ordering Codes
10 ORDERING CODES LPPIRG01 Pyrgeometer. Complete with shade disk, cartridge for silica-gel crystals, 2 spare sachets, levelling device, M12 8-pole connector and Calibration Report. CPM12AA8PG… cable has to be or- dered separately. LPPIRG01S Pyrgeometer. Complete with shade disk, cartridge for silica-gel crystals, 2 spare sachets, levelling device, M12 8-pole connector and Calibration Report. - Page 20 OTES LPPIRG01 V2.1...
- Page 21 OTES LPPIRG01 V2.1...
- Page 22 OTES LPPIRG01 V2.1...
- Page 24 G U A R A N T E E TERMS OF GUARANTEE All DELTA OHM instruments are subject to accurate testing, and are guaranteed for 24 months from the date of purchase. DELTA OHM will repair or replace free of charge the parts that, within the warranty period, shall be deemed non efficient according to its own judgement.
- Page 25 GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY Phone +39 049 8977150 | Fax +39 049 635596 www.deltaohm.com | info@deltaohm.com The quality level of our instruments is the result of the constant development of the product. This may produce some differences between the information written in this manual and the instrument you have purchased.
- Page 26 GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY Phone +39 049 8977150 | Fax +39 049 635596 www.deltaohm.com | info@deltaohm.com V2.1 10/09/2020...
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