psychrometer sensor - lsi lastem · 2020-06-15 · mw9001-eng-07-15/06/2020. 22 lsi lastem srl via...

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Wet&Dry forced ventilation temperatures sensor.

Design made according to ISO7726 standard

Direct calculation of the Relative Humidity and Dew

Point using LSI-LASTEM’s data logger according to

ISO7726 standard

2% accuracy assured over the whole range (0-100%)

and wide operative temperature (0÷60°C)

High accuracy Pt100 1/3 DIN B sensitive elements

Forced ventilation on the sensitive elements: >2 m/s

Long term stability and robust principle. Applications

in polluted/salty air even near the saturation with high

temperatures

Internal ISO17025 accreditated calibration laboratory

RELATIVE HUMIDITY AND AIR TEMPERATURE

PN ESU102

Temperature Principle Wet&Dry bulbs with forced ventilation Pt100 1/3 DIN B

Measuring range -5÷60°C

Accuratezza 0,10°C (0°C)

Output 2xPt100 DIN-IEC 751 table (EN 60751)

Resolution 0,01°C (M/R/E-Log)

Response time (T90 Air) 1,5 min

Relative Humidity % Principle Psychrometric

Measuring range 0÷100%

Accuracy 2% (5÷45°C)

Resolution 1%

Response time (T90 Air) 1,5 min

Protection grade IP54 General Information

Ventilation on the sensitive elements

> 2 m/s

Power consumption 30 mA (forced ventilation on)

Operative temperature 0÷60°C

Cable L=1 m

Connector Double min-din

Input type on E/M/R-Log N. 2 analog

E/M/R-Log derived quantities obtained

• Pyshrometric Relative humidity

• Dew point

Mounting On BVA305-315 stands or on table

Psychrometer sensor

Technical Specifications

Psychrometer sensor with wet&dry bulbs and forced ventilation. Wet bulb is closed inside a wet cotton sock from a distilled water tank. This sensor has a very good stability because it is based on a direct measurement of temperature using 1/3 DIN element and it is not sensitive to the time drift of commonly used capacitive hygrometer elements. LSI-LASTEM data loggers can calculate Relative Humidity starting from wet&dry temperatures.

MW9001-ENG-07-15/06/2020

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LSI LASTEM Srl

Via Ex SP. 161 Dosso, 9

20090 Settala (MI)

Italy

Tel. +39 02 954141

Fax +39 02 95770594

Email [email protected]

www.lsi-lastem.com

Accessories

SVICA1102 Calibration certificate. ISO9001 type (Relative Humidity)

SVACA1105 Calibration certificate. ISO17025-ACCREDIA type (Relative Humidity)

MM3101 Spare cotton sock

Psychrometer sensor

There are several reasons to select psychrometer (wet&dry bulbs) or capacitive sensors to measure Relative Humidity. Here

above the list of advantage and disadvantage for both technologies:

Capacitive Wet&dry bulb

Water consumption No water Water must always be inside the water tank

Measurement below 0°C Can be used below 0°C Cannot be used below 0°C (because of the

water presence in the tank)

Measurement at high temperature

and RH values

Cannot discriminate when RH is above

95%

Can discriminate even above RH 95%

Temperature accuracy and re-

sponse time

Good temperature accuracy (0,1°C) Very good temperature accuracy (0,1°C). The

forced ventilation across the element facili-

tate the convective exchanges reducing the

response time

Measurements in severe conditions

(polluted, salty, corrosive air)

More fragile. When corrupted, sensor

needs to be fully replaced

Even in severe conditions the wet&dry bulb

is very rugged. Simple maintenance is re-

quired when the cotton sock becomes dirty

Sensor life time

(stand alone applications)

In fix applications, life time is about 2-

3 years

In fix applications the sensor life time is only

depending by the mechanical conditions.

Sensitive elements are very rugged

Power comsumption Low power consumption High power consumption because of pres-

ence of the forced ventilation by the fan

Application Can be used indoor and outdoor

(using a radiant screen)

Can be used indoor. Outdoor, only in above

freezing temperatures. In outdoor, it needs

to be closed in a Stevenson screen

M-Log (ELO009) reads wet&dry bulb temperatures and produces Rela-

tive Humidity and Dew Point values according to the ISO7726 standard

formulas.

mailto:info@lsi/lastem.com




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PN DMA672.1 ESU403.1

Output RH%: 0÷1 Vdc

°C: Pt100 DIN-IEC 751 table

Power supply 6÷18 Vdc

Connector L= 3 m free wires (8 wires) L= 3 m + N.2 Mini-Din connectors

Data logger compatibility

M-Log (ELO008) R-Log (ELR515.1)

E-Log, A-Log

M-Log (ELO009)

R-Log (ELR510.1)

Temperature Principle RTD Pt100 1/3 DIN B (Class AA EN60751)

Measuring range -50÷100°C

Accuracy 0,1°C (0°C)

Output Pt100 DIN-IEC 751 table (EN 60751)

Resolution 0,01°C

Response time (T90) 4 s (1 m/s air flow)

Long term stability <0,1°C/year

Common Technical Specifications

Thermohygrometer


Air temperature and RH% sensor with Pt100 output for temperature and 0÷1 Vdc output for RH%.

It is a precise and reliable sensor, suitable for a continuous measurement even in severe environments, in presence of pol-

lutants, deep thermal and hygrometric ranges in long-term monitoring.


Small dimensions and outstanding performances allow this

sensor to be used in a wide range of environmental applica-

tions

Measurement of both air temperature and Relative Humidity

Fast return after saturation

Standard dust filter to ensure good protection against

pollutants

4 4

LSI LASTEM Srl


20090 Settala (MI)

Italy

Tel. +39 02 954141

Fax +39 02 95770594


www.lsi-lastem.com

Relative humidity Principle Capacitive


Accuracy ±1% RH (5-95%)

Long term stability <±1%/year

Response time (T90) 10 s (1 m/s air flow)

Hysteresis <1%

Resolution 0,1%

General Information Protection grade IP66

Operative temperature -50÷100°C

Thermohygrometer (direct output)

Accessories

SVICA0003 Calibration certificate ISO9001 (Temperature)

SVACA0006 Calibration certificate ISO17025-ACCREDIA (Temperature)

SVICA1003 Calibration certificate ISO9001 (Relative Humidity)

SVACA1005.1 Calibration certificate ISO17025-ACCREDIA (Relative Humidity)

BVA305 Arm for fixing sensors on BVA304 tripod

BVA315 Arm for fixing sensors on BVA304 tripod

ESU403.1 thermo-hygrometric sensor is

connected to M-Log data logger/reader sys-

tem (ELO009) which reads Temperature and

Relative Humidity and produces Dew Point

values according to the ISO7726 standard

formula.

This system can be used as portable hand-

held solution or for middle term portable

monitoring solutions, in this case ESU403.1

can be fixed on the tripod by means of the

BVA305 stand.

Monitoring solution, tripod

mounting using BVA305 stand Hand-held solution





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Thermohygrometer (analogue, digital and radio outputs )

4÷20 mA, RS485-Modbus RTU and Radio outputs

version

Easy installation of the sensitive part, even in small

spaces or pipes

Cable lenght from 5 to 100 m

Dew Point calculation and output (replace RH%

output)

Simple replacement of the sensitive element

Outstanding accuracy (1,5%) for RH%

Sensor for measuring the air temperature and relative humidity in indoor environments or inside pipes.

In applications with dirty air, it is possible to mount the sensor inside the DYA225 shelter in order to prevent dirt from

accumulating directly on the sensitive element.

PN EXP815.1 DMA975.1 DMA875.1

Measurements °C/RH% °C/RH% °C/RH%

Output Radio RS485 2x0-4÷20 mA

Frequency 868 MHz - -

Radio transmission power

25 ± 3 mW - -

Radio transmission distance (line-of-sight)

600 m - -

Transmission rate 10’ - -

Battery life >2 years - -

Protocol - Modbus RTU®,

TTY-ASCII

-

Configuration - Hyperterminal -

RS485 protection - Galvanic insulation

(3 kV, UL1577)

-

RS485 speed - 1200÷115 kbps -



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Thermohygrometer

(analogue, digital and radio outputs )

PN EXP815.1 DMA975.1 DMA875.1

Power supply Battery (AA 3,6 V) 10÷30 Vac/dc 10÷30 Vac/dc

Power consumption <10 µW stand-by 120 mW in trasmissione

1 W 1 W

Electric protections NO (electrically insulated system)

Tranzorb and Emifilter Tranzorb and Emifilter

Temperature Principle RTD Pt100 1/3 DIN B (Class AA EN60751)

Measuring range Programmable: -40÷60°C, -50÷60°C, -50÷70°C, -30÷100°C

Accuracy 0,1°C (@0°C)

Resolution 0,01°C

Response time (T90) Typical 4 s (1 m/sec air flow)

Long term stability <0,1°C/year

Relative Humidity Principle Capacitive


Accuracy ±1% (@5÷95%)

Output Programmable: RH% or Dew Point

Long term stability <±1% / year

Response time (T90) Typical 10 s (1m/s air flow)

Hysteresis <1%

Resolution 0,1%

General Information Protection rate IP65

Operative temperature -50÷100°C


7 7

LSI LASTEM Srl


20090 Settala (MI)

Italy

Tel. +39 02 954141

Fax +39 02 95770594


www.lsi-lastem.com

SVICA0003 ISO9001 type calibration certificate (Temperature)

SVACA0006 ISO17025-ACCREDIA type calibration certificate (Temperature)

SVICA1003 ISO9001 type calibration certificate (Relartive Humidity)

SVACA1005.1 ISO17025-ACCREDIA type calibration certificate (Relative Humidity)

DWA505 Cable L= 5 m

DWA510 Cable L= 10 m




MG2251 7 pin free female connector

ML3015 Sensitive element (spare part) for DMA815.1-875.1. EXP815.1

EXP301 Radio signal receiver from EXP815.1 radio sensor. Output compatible with data loggers (M/E-Log) Maximum number of receivable sensors: 200 Battery: NiCd 9 V Power supply: 12 Vdc Connection cable to data logger: DWA601

DYA225 Open well for T+RH% sensors when mounted in ducts in presence of dirty air flow. Material: Iron Dimension: L. = 200 mm Ø 92 mm Support plate: 120x120 mm

Accessories

Thermohygrometer

(analogue, digital and radio outputs )





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Thermohygrometer (radio)

Radio sensor with built-in Temperature and RH% sensitive

elements

Version with additional external wired sensors: N.2 surface

temperatures (EXP811.2); lux and surface temperature sen-

sors (EXP813.2)

Design and features made for Museums applications

Long distance line of sight (600 m)

Because of 869,450 MHz radio frequency, good ability to cross the barriers

Long battery life: 2 years

Connection to LSI LASTEM’s data loggers by means of EXP301

radio receiver

Wireless sensors for ambient Air Temperature and Relative Humidity measurements with radio communication (869,450 MHz) to data logger. Three sensor versions are available, two of them have additional inputs for external sensors: - EXP811.2 (N.2 temperature sensors) - EXP813.2 (N.1 temperature sensor, N.1 lux sensor).

PN EXP812.1 EXP811.2 EXP813.2

Measurements Temperature + Relative Humidity

Aditional inputs for wired sensors

- N.2 Temperatures Pt100 N.1 Temperature Pt100 N.1 Lux sensor

Output values • Temperature

• Relative Humidity

• Battery voltage

• Battery charge (%)

• Air Temperature


• Battery voltage


• N.2 Temperatures

(external sensors)

• Air Temperature


• Battery voltage


• Temperature (external sensors)

• Lux sensor (external)



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Thermohygrometer

(radio)

Temperature Principle C-MOS (Silicon)

Range -20÷60°C

Accuracy 0,1°C (20-60°C); 0,2°C(<20°C, >60°C)

Resolution 0,01°C

Response time (T90 in air) 30 s (@ 0,2 m/s)

RH% Range 0÷100%

Accuracy ±1,8% (0-80% @25°C) ±2% (>80% @25°C)

Resolution 0,01°C

Response time (T90 in air) 8 s

Radio Output Radio

Frequency 869,450 MHz

Canalization 25 kHz

Radio Transmission Power 25 ± 3 mW

Radio Transmission distance (line-of-sight)

600 m

Radio Bit rate 9600 bps

Transmission rate 10’

Radio antenna Esternal (DEC254)

Configuration Dip switch

Battery AA 3,6 V, non rechargeable lithium battery

Battery life >2 years

Power supply Battery

Power consumption <10 µW stand-by, 250 mW during transmission

Receiver Model EXP301, RS232 output


Surface temperature

(EXP811.2, EXP813.2)

Principle Pt100 DIN A (Class A EN60751)

Measurement range -20÷60°C

Accuracy 0,15°C (@0°C)

Resolution 0,01°C (A/M/R/E-Log, P1)

Response time (T90) 35 s

Lux

(EXP813.2)

Principle Photodiode

Measurement range 0÷5000 lx

Accuracy 3%

Resolution 1 lx

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LSI LASTEM Srl


20090 Settala (MI)

Italy

Tel. +39 02 954141

Fax +39 02 95770594


www.lsi-lastem.com

Thermohygrometer

(radio)

EXP301 Radio signal receiver from EXPnnn radio sensors, RS232 output, compatible with data loggers (M/E-Log) Maximum number of receivable sensors: N.200 Battery: NiCd 9 V Power supply: 12 Vdc

DEC254 Omni-directional antenna EXP301

DWA601 Serial cable L= 10 m for connecting EXP301 to E/M-Log data logger RS232 port

DWA601.2 Serial cable L= 2 m for connecting EXP301 to E/M-Log data logger RS232 port

MG0510 AA 3,6 V spare battery for EXPnnn sensors

CLO311 Transparent plexiglass wall support for EXPnnn sensors

Accessories

EXP81n sensors range is especially designed for application where

advance technical specifications are needed, but even where the monitor-

ing system design must fit the architectural requirements, as in muse-

ums. In the picture on the left, two sensors used to monitor Temperature

and RH% in the “Last supper” room are shown.

Last Supper is a late 15th-century mural painting by Italian artist Leonar-

do da Vinci housed by the refectory of the Convent of Santa Maria delle

Grazie in Milan, Italy.





psychrometer sensor - lsi lastem · 2020-06-15 · mw9001-eng-07-15/06/2020. 22 lsi lastem srl via...

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