COMET SYSTEM, s.r.o.
Bezrucova 2901
756 61  Roznov pod Radhostem
CZECH REPUBLIC
Tel.: +420 571 653 990

E-mail: info@cometsystem.com


 

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And Regulators
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Recorder with Printer
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Probes

COMETEO Multi-Plate Radiation Shield for Sensors, Naturally Ventilated

code: F8100
Newly developed meteorological screen for humidity and temperature transmitters.

Professional passive solar radiation and weather shelter for meteo sensors.


"Not only radiation shield, but the complete COMETEO system minimizing negative effects"

Applications:

- meteorological

- weather stations

- snow guns

- building management systems

 

Unique optimized design for best performance:

- passively ventilated, no power required

- measuring electronics entirely protected inside the shield

- prevention of condensation by downward sensor orientation

- advanced weather protection by maximised top cover area


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Features

Professional multi-plate radiation shield is used to protect air temperature and humidity sensors.

The shield minimizes radiation reaching the sensor, minimizes radiation absorbed by the shield and maximizes ambient air flow around the sensor.

The enlarged top plate is 210mm in diameter and designed to provide shade for high solar angles for lower plates.

Meteorological shield is made of ASA plastic which is resistant to mechanical damage and UV radiation. ASA is UV stabilized, antistatic and very stable over time. New design and material of plates for high reflectivity, low thermal conductivity and maximum weather resistance.

Optimium shield design is a function of location and climatology and the parameters of the sensor inside the shield. Climatological characteristics include maximum solar elevation angle, ground reflectance and probability of high radiation together with very low wind speeds.

 

Air Temperature in MeteorologyMeteo shield

The measurement of air temperature in meteorology is a difficult task. Accurate air temperature measurements require minimization of local effects (e.g. trees and buildings) and minimization of environmental effects that influence the actual sensing of the temperature at the position of the sensor.

World Meteorological Organization - WMO defines internationally  the temperature of the air nearby the earth's surface as “the temperature indicated by a thermometer exposed to the air in a place sheltered from direct solar radiation” (WMO, 1992).

The main functions of thermometer shields are to protect the sensor from direct or indirect radiation from the sun during the day and from radiation from the sensor to the sky at night and to protect the sensor from wetting. Wetting of the sensor and screen is caused by fog, drizzle or rain. But protection against radiation and wetting conflicts with the requirement of sufficient ventilation. Due to insufficient ventilation a microclimate develops within the screen. In fact, all screens develop their own microclimate and the difference with the ambient climate depends on screen type and design.

From the above, it follows that thermometer shields should have a high reflectivity to minimize heating of the plates and subsequent warming of the air as it flows over the plates to the sensor. To decrease the time the air is in contact with the plate, the plate radial distance should be as small as possible. To prevent the development of microclimates within screens, also the blockage of ambient airflow by the screen should be minimized by making the plate spacing as large as possible, taking into account the requirement that wetting of the sensor should be prevented. Any design of a thermometer screen is a result of compromises. Finding the optimal design is a serious challenge that may require the use of different methods for studying the behavior of screens.

In the field, the actual differences between the air temperature in the screens and the ambient air temperature depend mainly on the prevailing weather conditions. Also the state of the ground and humidity of the soil will affect the air temperature in the screen as radiation or reflection will cause screen dependent biases. This can easily occur in areas with snow cover and in deserts.

Technical Data


  size
doc Instruction manual 740 kB
doc Datasheet 1.1 MB

COMETEO Fan Aspirated Radiation Shield for Weather Sensors COMETEO Fan Aspirated Radiation Shield for Weather Sensors
code: F8200
Newly developed motorized meteorological screen for humidity and temperature transmitters.

Professional active solar radiation and weather shelter for meteo sensors.

COMETEO Universal Multi-plate Meteorological Shield for Weather Sensors COMETEO Universal Multi-plate Meteorological Shield for Weather Sensors
code: F8110
Newly developed multiplate meteorological screen for weather transmitters. Radiation and weather shelter is designed for the protection of any meteo sensor with a diameter of 13 to 18 mm.
T3113D Temperature and humidity duct probe with 4-20mA output T3113D Temperature and humidity duct probe with 4-20mA output
code: T3113D
Humidity, temperature transmitter. Outdoor, indoor use. Duct mount.
T0213D Temperature and humidity duct probe with 0-10V output T0213D Temperature and humidity duct probe with 0-10V output
code: T0213D
Humidity, temperature transmitter. Outdoor, indoor use. Duct mount.
T3413D Temperature and humidity duct mount transmitter with RS485 output T3413D Temperature and humidity duct mount transmitter with RS485 output
code: T3413D
Humidity, temperature transmitter. Outdoor, indoor use. Duct mount.
Web Sensor T7613D with PoE, duct mount - remote thermometer hygrometer barometer with Ethernet interface Web Sensor T7613D with PoE, duct mount - remote thermometer hygrometer barometer with Ethernet interface
code: T7613D
Ambient temperature, relative humidity, atmospheric pressure t-line Web sensor with Power over Ethernet feature. Remote alarm. Duct mount.
T0211 Temperature and humidity probe with 1m cable and 0-10V output T0211 Temperature and humidity probe with 1m cable and 0-10V output
code: T0211
Humidity, temperature transmitter. Outdoor, indoor use.
T3111   RH+T+Tdp cable probe, 1m cable length, output 4-20mA T3111 RH+T+Tdp cable probe, 1m cable length, output 4-20mA
code: T3111
Humidity, temperature transmitter. Outdoor, indoor use.
T7311 Industrial temperature, humidity, bar. pressure transmitter - RS232 output T7311 Industrial temperature, humidity, bar. pressure transmitter - RS232 output
code: T7311
Temperature, humidity, atmospheric pressure transmitter. Outdoor, indoor use.
T7411 Industrial temperature, humidity, bar. pressure transmitter - RS485 output T7411 Industrial temperature, humidity, bar. pressure transmitter - RS485 output
code: T7411
Humidity, temperature transmitter with T+RH probe on the cable. Outdoor, indoor use. For environmental monitoring.
Web Sensor T7511 - remote thermometer hygrometer barometer with Ethernet interface Web Sensor T7511 - remote thermometer hygrometer barometer with Ethernet interface
code: T7511
Ambient temperature, relative humidity, atmospheric pressure t-line Web sensor. Remote alarm.
P0122 - Duct mount temperature probe -30 to +80°C / 4 to 20mA, IP65 P0122 - Duct mount temperature probe -30 to +80°C / 4 to 20mA, IP65
code: P0122
Remote transmitter with temperature sensor at 120mm stem. Outdoor, indoor use.
P0212 Duct mount temperature transmitter with 0-10V output, stem length 120mm P0212 Duct mount temperature transmitter with 0-10V output, stem length 120mm
code: P0212
Duct temperature transmitter with 0-10V output is built in a durable watertight case. The length of stainless steel stem is 120mm. Output temperature range is user adjustable.
T4111 Temperature transmitter with 4-20mA output T4111 Temperature transmitter with 4-20mA output
code: T4111
Temperature transmitter for Pt1000/3850ppm sensor with 4-20mA output for two-wire connection is built in a durable watertight case. Output temperature range is user adjustable. Degrees Celsius and Fahrenheit are user selectable.
T4211 Temperature transmitter with 0-10V output T4211 Temperature transmitter with 0-10V output
code: T4211
Temperature transmitter for Pt1000/3850ppm sensor with 0-10V output is built in a durable watertight case. Output temperature range is user adjustable. Degrees Celsius and Fahrenheit are user selectable. Large dual line LCD is an advantage. Display is possible to switch off.
T4311 Temperature transmitter with RS232 interface T4311 Temperature transmitter with RS232 interface
code: T4311
Temperature transmitter for Pt1000/3850ppm sensor is built in a durable watertight case. Degrees Celsius and Fahrenheit are user selectable. Large dual line LCD is an advantage. Display is possible to switch off.
T4411 Temperature transmitter with RS485 interface T4411 Temperature transmitter with RS485 interface
code: T4411
Temperature transmitter for Pt1000/3850ppm sensor is built in a durable watertight case. Degrees Celsius and Fahrenheit are user selectable. Large dual line LCD is an advantage. Display is possible to switch off. Computerized design ensures maximum long term stability and failure indication.
Web sensor T4511 - remote thermometer with Ethernet interface Web sensor T4511 - remote thermometer with Ethernet interface
code: T4511
Ambient temperature t-line Web sensor for Pt1000 sensor. Remote alarm.
P4121 Temperature Transmitter  Pt1000 -30°C to +80°C/ 4 to 20 mA P4121 Temperature Transmitter Pt1000 -30°C to +80°C/ 4 to 20 mA
code: P4121
Temperature transmitter for Pt1000 sensors. Outdoor, indoor use.
Thermo-hygrometer with external probe Thermo-hygrometer with external probe
code: S3121
Data logger is designed for record of temperature and humidity. Values are stored to a non volatile electronic memory. Data transfer to the personal computer for further analysis is performed via USB, RS232, GSM.
D4141 Thermo-hygro-barometer D4141 Thermo-hygro-barometer
code: D4141
Thermometer, hygrometer, barometer is designed for measurement and datalogging of temperature, relative humidity and atmospheric pressure into the internal non-volatile memory.
Ethernet Multilogger M1140 - thermo hygro meter with 4 MiniDIN inputs Ethernet Multilogger M1140 - thermo hygro meter with 4 MiniDIN inputs
code: M1140
Universal datalogger with 4 hardware MiniDIN inputs for connecting temperature and humidity probes.
Multilogger can be installed permanently to Ethernet network or work as portable device.
Included is traceable calibration certificate in accordance with EN ISO/IEC17025.