LSI Thermohygrometers User Manual

Environmental monitoring solutions
Thermohygrometers
User manual

Thermohygrometers

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 2020-2022 LSI LASTEM. All rights reserved.
Summary

Introduction

The LSI LASTEM thermohygrometers featured in this manual are sensors designed even for meteorologicalapplications. Precise and reliable, this sensor is suitable for continuous meteorological measurements also insevere environments and in presence of steep thermal and hygrometric variations.
DMA672.1, DMA672.4, DMA672.5 temperature output is Pt100 element and 0÷1 Vdc output for RH%.
DMA672.3 output is 0÷1 Vdc for both Temperature and RH%. DMA672.3 is very suitable for tropical weatherin continuous high temperature and RH conditions. For outdoor application it should be coupled with a antiradiant shield.
DMA875 and DMA975 are equipped with a high efficiency natural ventilation anti-radiant shield (with specialblack painting on the lower surface of the plates) ensures that the sensing element is protected by sun raysfor accurate air temperature readings. Output of the models DMA975 is RS485 using Modbus RTU® or TTYASCII protocols.
For even better results in low wind and high solar radiation conditions, model DMA867 is equipped with a forced ventilation shield.
EXP815 model is equipped with an internal radio to send measurement up to 600 m far to data logger equipped with radio receiver.

Versions

2.1 DMA672.x models

2.2 DMA867, DMA875, DMA975 and EXP815 models

and Emifilter
Ventilation| Natural| Forced
Resolution| Temp: 0.01 °C RH: 0.1%| Dipending on data acquisition
Temperature| Principle| RTD Pt100 1/3 DIN B (Class AA EN60751)
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Measuring range| Programmable: -40÷60 °C, -50÷60 °C, -50÷70 °C, -30÷100 °C
Accuracy| 0.1 °C (@0 °C)
Output| Pt100 DIN-IEC 751 table (EN 60751)
Response time (T90)| Typical 4 s (1 m/s air flow)
Long term stability| <0.1 °C/year
Relative Humidity| Principle| Capacitive
Measuring range| 0÷100%
Accuracy| ±1% (@5÷95%)
Output| Programmable: RH% or Dew Point
Resolution| 0.1%
Response time (T90)| 10 s (1 m/s air flow)
Long term stability| <±1%/year
Hysteresis| <1%
General Information| Protection type| IP66
Operative temperature| -40÷80 °C
Data logger compatibility| M-Log (ELO008) R-Log (ELR515) E-Log
A-Log using ALIEM module

Installation

For installation, choose a site where conditions are representative of the environment to be examined. The thermometers and thermohygrometers must be mounted in places where the morphological conditions of the surfaces, the urban structures and the environmental conditions reflect as much as possible the general conditions of the site where the measurements are to be made. It is important that, in the areas close to the installation, there are no structures that can radiate heat (concrete floors, asphalt, walls, etc.) The thermohygrometer should be installed at a distance of 1.5 – 2 m from the ground (see WMO n ° 8 part 2).
3.1 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.

3.2 Mechanical installation and connection
3.2.1 DMA672.x sensors
The installation of the DMA672.x sensors changes according to the type of anti-radiant shield used.
➢ Using DYA230 natural ventilation anti-radiant shield:

1. Fix the DYA049 supporting collar to the pole at a height of about 1.5 – 2 m.
2. Fix the DYA230 anti-radiant shield to the DYA049 supporting collar.

➢ UsingDYA233 natural ventilation anti-radiant shield:

1. Fix the DYA046 bar on the pole.
2. Fix the DYA233 anti-radiant shield to the DYA046 bar.

➢ Using DYA231 forced ventilatione anti-radiant shield:

1. Fix the DYA049 supporting collar to the pole at a height of about 1.5 – 2 m.
2. Fix the DYA231 anti-radiant shield to the DYA049 supporting collar
3. Insert the sensor stem inside the anti-radiant shield. The sensitive elements should result in the central position on the anti-radiant shield and then secure it using the cable gland.
4. Run the cable to the data logger.
5. Connect the cable to the data logger as specified in the drawing (DISACC) supplied with the sensor.

3.2.2 DMA867, DMA875 and DMA975 sensors

1. Remove the cover from the sensor box and set the dip-switches for:
2. 0…20 mA or 4…20 mA output
3. Temperature measurement range
4. Relative Humidity or Dew Point output
5. Fix the cover to the box.
6. Fix the DYA049 supporting collar to the pole at a height of about 1.5 – 2 m.
7. Fix the anti-radiant shield support to the DYA049 supporting collar.
8. Screw the DWA5xx cable connector onto the sensor box.
9. Connect the cable to the data logger as specified in the drawing (DISACC) supplied with the sensor.

3.2.3 EXP815 sensor

1. Fix the DYA049 supporting collar to the pole at a height of about 1.5 – 2 m.
2. Fix the anti-radiant shield support to the DYA049 supporting collar.
3. Remove the cover from the sensor box and move the ignition switch to ON; screw the cover to the box.
4. Place/install the EXP301 receiver near the PC or data logger.

3.3 LSI LASTEM data logger configuration
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 (eg DMA672.1) 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.

Operation check

To check the sensor output it is necessary to have the accompanying drawing (DISACC) of the sensor and a multimeter.
Identify the sensor output (§2). For sensors with analog output (current or voltage), proceed as follows:
➢ Current output (0/4÷20 mA):

1. Set the multimeter to measure signals in direct current (DC) 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. Read the value displayed on the multimeter and apply the formula shown in §4.1.

➢ Voltage output (V):

1. Set the multimeter to measure voltage signals and scale in V.
2. Connect the red test lead (+) of the multimeter to the wire corresponding to the positive signal (+ Sig) and the black test lead (-) to the negative signal wire (- Sig) of the sensor (it is not necessary to disconnect the sensor from the data logger.)
3. Read the value displayed on the multimeter and apply the formula shown in §4.1.

Verification of the digital output (RS485) can be done using a PC, equipped with an RS232 serial port and in which the third-party program modpoll: (https://www.modbusdriver.com/modpoll.html) is installed.

1. Connect the sensor serial cable to the PC serial port.

2. Open a DOS Prompt window and type the following command (it is assumed that the transmission parameters are set as follows: Baudrate: 9600 bps, Parity: None and that the PC serial port used is COM1):
   modpoll -a 1 -r 1 -c 3 -t34:float -p none -b 9600 com1 [Enter] For the list of available commands, type the command modpoll /help.

3. The program displays the values for the following quantities:
   Temperature, Relative Humidity, Dew Point.

For more information about the DMA975 sensor, refer to INSTUM_01371 user manual.
4.1 Calculation of the measurement value based on the sensor analog output
To calculate the value of the measurement, temperature or relative humidity or dew point, starting from the current or voltage value, apply the formula:
FORMULA:

where:
Mlow = lower measurement limit
Mrange = measurement range
Urange = output measurement range (V or mA)
Uout = measured output (V oppure mA)
Ulow = lower output limit (V o mA)
EXAMPLE:

With sensor with the following features:

• Temperature range: -50÷100 °C
• Output measurement range: 4÷20 mA
• Measured output: 12 mA

Maintenance

This sensor is a precision measurement apparatus. In order to maintain the specified measurement precision over the time, LSI LASTEM recommends to check it periodically (at least twice a year); it is moreover suggested the replacement of the measure element according to the place of installation (in persistent conditions of high humidity, pollution, dust and chemical substances presence, the sensitive element deteriorate faster than the one placed in a location with less adverse conditions). It is, anyway, a good rule to replace the sensitive element at least once every two years.
5.1 Cleaning of the anti-radiant shield and the porous filter
Referring to the picture of §5.2, proceed as follow:

1. Remove power from the sensor. Depending on the model, disconnect the cable from the Connector from DWA cable or from the data logger.
2. Unscrew Shield cable gland and pull down the Stem.
3. Clean the extern side of the Anti-radiant shield with the aid of a small brush or a wet rag.
4. Clean the stem using a wet rag.
5. Unscrew the Porous filter.
6. Clean the filter with a cold air jet.If the filter is particularly damaged, replace it.

After cleaning mount the sensor following the operations described above in reverse order.
5.2 Sensing element replacement
The sensing element is mounted on the stem. The stem replacement procedure is similar for all sensors.
Below we refer to the DMA975 model.

1. Remove power from the sensor. disconnecting the cable from the Connector from DWA cable of the Case.
2. Remove the Case cover.
3. Unscrew the wires from the Terminal block.
4. Unscrew the Case cable gland.
5. Unscrew Shield cable gland and pull down the Stem.
6. Insert the new Stem in the Shield cable gland until reaching the reference (the label); tighten Shield cable gland.
7. Insert the stem cable on Case cable gland and connect wires on the Terminal block as reported on the sensor drawing.
8. Tighten Case cable gland. 9. Montare il coperchio e collegare il cavo a Connettore cavo DWA. Mount the case cover and connect the cable to the Connector for DWA cable.

Accessories / Spare parts

data loggers M/E-Log)

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.

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

CE Conformity Declaration

EC Declaration of Conformity| Certificate No.| DV31.10g.16 007.3.00 N.EMV.docx
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as defined by the EC Directive
The manufacturer ceitifles that the following products are compliant with the specification of the EC Directive:

Manufacturer:| The physical devices are manufactured by: ROTRONIC AG
Grindelstrasse 6.
CH-8303 Bassersclorf, Switzerland.
http://www.rotronic.ch| Phone +41(44) 838’11’11
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Product designation

DVO4-31.0898.03.TST.EMV

Release confirnration:

EMC inspected by:| ROTRONIC AG
Grindelstrasse 6
CH-8303 Bassersdorf. Switzerland
http://www.rotronic.ch|
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EMC-Directive 2014/30/EU
RoHS-Directive 2011/65/EU
The following standards are applied:

EN 61000-6-1: 2007
IEC 610004-6-1: 2005 ed 2.0| Electromagnetic compatibidy (EMC) – Part 6-1: Generic standards – Immnunity for residential commercial and light- industrial environments
---|---
EN 61000-6-2: 2005
IEC 61000-6-2: 2005 ed 2.0| Electromagnetic compatibiMY (RC) – Part 6-2: Generic standards – for industrial environments
EN 61000-6-3: 2007+
Al :2011+AC:2012
IEC 61000-6-3: 2011 ed 2.1| Electromagnetic compatibility (EMC) – Part 6-3: Genetic standards -Emission standard for residential, comercial and light- industrial environments
EN 61000-6-4: 2007+
A1:2011
IEC 61000-6-4: 2011 ed2.1| Electromagnetic compatibility (EMC) – Part 6-4: Genetic standards -Emission standard for industrial environments
EN 50581: 2012
IEC 50581 : 2013- 02| Technical documentation for the assessment of electlical and electronic products with respect to the restriction of hazardous subtances
(Place, date)
Basserdorf, 20.04.16| |
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Ref. CE005l06
LSI Lastem Srl – Loc Dosso 20090 Settala ‘MI) Italy
Tel +39.02 95414.1
Fax +39.02.95770594
http://www.lsi-lastem.com
E.Mail info@lsi-lastem.it

CE CONFORMITY DECLARATION
Producer declaration about the warranty that the series production is up to the Certified sample.
Producer declaration about the conformity to the EMC European rules.
Name of the producer: LSI LASTEM Srl.
We hereby declare that all the products of the following series.
Product name: Temperature and Relative Humidity sensors.
Codes: DMA867.
Produced by our company are produced in the same way as the exemplar tested at the accredited centre NEMKO SpA’ [20853 Biassono (MB)] , that issued the Test Report “257775-1TRFEMC”.
The products satisfy the requirements imposed by the European rule.
EN 61326-1 (2006) , EN55011 — EN61000-3-2. EN61000-3-3.
Compliance with this directive implies conformity to the following European Norms (in brackets are the equivalent international standards).

• EN 50082 — 1
• EN 55011
• EN 55022 (CISPR 22)— Electromagnetic Interference
• EN 55024 (IEC61000-4-2,3,4,5,6,8,11)— Electromagnetic Immunity
• EN 61000-3-2 (IEC610000-3-2) — Power Line Harmonics
• EN 61000-3-3 (IEC610000) — Power Line Flicker
• EN 60950 (IEC60950) — Product Safety

In accordance to the aforesaid rules, products are marked CE.
The present declaration covers all the options derived by the specified product.
Dr. Giulio Certo.
General Manager and Rappresentative.

Ref. CE009/12 Date 10-Oct-2013

CE CONFORMITY DECLARATION
Producer declaration about the warranty that the series production is up to the Certified sample
Producer declaration about the conformity to the EMC European rules
We hereby declare that all the products of the following series:
Termoigromeler for envioronmental application:
DMA567.Dt0A575,DMA585,Dtv1E775,DME785, DMA 875
to witch this declaration relates; is in conformity with the relevant provisions of the following standard and other normative documents :
EN-61326 2006 Industrial Location
following the provision of the Directive:
89/336/EEC, 2004/108/CE
in accordance to the aforesaid rules, product are market CE The present declaration covers all the options derived by the specified product.

Dr. Giulio Certo
General Manager and Rappresentative

Experts in environmental technological measures

Declaration of conformity
Subject
Product code: DMA672.1, DMA672.2, DMA672.3, DMA672.4, DMA672.5, DMA672.6
Description ‘Thermo-hygrometer sensor.
Manufacturer
LSI LASTEM Srl Via ex S.P. 161 loc. Dosso 9 20049 Settala (MI) – Italy
Declaration
We declare that the products covered by this docu-ment have been designed in compliance with the following European Directives and harmonized standards:
2014/ 30/Eti – EMC eitcvorriognetic compotitiity directive.
EN 61000-6.1: 2007, EN 61000-64: 200S-Genenc standards for electromagnetic immunity in residential and industrial enwonments.
EN 61000.6.1: 2007.41 2011.AC 2012, EN 61000-64 2007.A1:2011- Genenc standards for electromagnetic erniniOnS in residential and indintrial mwonments 2011/65/EU –
The Re$07.00 of 14020,0014 Substances Directive. (Our products doh, contool the “subs tones” & -prepo,owns. (Arikk
Legal Representative.
Andrea Certo.
15/01/2021.

References

• lastem.com
• Environmental Monitoring Solutions - LSI LASTEM
• Environmental Monitoring Solutions - LSI LASTEM
• Free Modbus Master Simulator and Test Tool

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