Weather Station
AWS SENSOR LOCK-IN SPECIFICATION
WIND DIRECTION SENSOR: (1)Sensor : Wind vane coupled to a Linear endless Potentiometer, (2)Range : 0 to 359 degrees from North, (3)Accuracy : + 3 degrees., (4)Linearity: With in the accuracy limit, (5)Output: 0 to 5 K ohms resistance corresponding to the range option of 0 to 1 Volt or 0 to 2.5 Volt for the range, (6)Power input : 5 to 12 Volt depending on the users requirement., (7)Termination: On a 4/5 pin MS connector ( including Anemometer ),
WIND SPEED SENSOR:
Sensor: 3 cup rotor coupled to a chopper and IR emitter/ detector circuit.
Range: Wind speed 0 to 60 Meters /sec
Accuracy: + 2% of full scale
Starting Threshold : 0.3 Meters /sec
Linearity: Within the accuracy limits.
Output: TTL level pulses frequency proportional to W . Speed.
Approx. 15 Hz/ Mtr/sec OPTION – Voltage output 0 - 1 V or 0 – 2.5V for 0 to 60 Meters /sec
AIR TEMPERATURE SENSOR:
Sensor: Standard Platinum RTD element (PT1000 or PT100 mounted inside weather shield)
Range: - 40 degrees to + 60 degrees Celsius.
Resolution: 0.1 degrees Celsius.
Accuracy: + 0.2 degrees Celsius.
Output: Resistance
Weather Shield: Weather shield coated with weatherproof reflective white paint
Size of the body: 320(H) x 90 mm diameter (with weather shield).
Housing: Nylon body with weather shield and brass system to mount the Sensor: The sensor is fitted with a three-pin MS connector for easy removal.
HUMIDITY SENSOR:
·Sensing: Solid-state capacity type sensor. Resolution: 0.1 %.
Range: 0 to 100 % operating at - 40 ˚C to +50˚ C
Accuracy: ± 3% of full-scale reading.
Operating Temperature: - 40 ˚C to +50˚ C
Power requirement: + 5 volts DC.
Power consumption: ~ 4 mA.
Output : 0- 1V for 0 to 100% humidity
Weather Shield: Weather shield with weatherproof reflective white paint coating.
Size of the body: 250 (H) x 90 mm diameter. (With weather shield)
RAINFALL SENSOR: Sensor: Tipping bucket rain gauge.
Sensing: Magnet and reed switch (on-off output).
Resolution: 0.5 mm.
Accuracy: better than + 5%
Operating Temperature: -40 ˚ C to +50 ˚ C with built in heater (optional)
Rim diameter: 203 mm.
Collecting area: 325 mm².
The rain gauge is made of FRP.
Bucket is made of stainless steel and mounting assembly of powder coated brass.( SS316 body optional)
Capacity: Unlimited.
Sensitivity: 0.5 mm or, 0.2 mm (rainfall per pulse)..
SOLAR RADIATION SENSOR MODEL - DWR 8101:
Sensor : 72 element thermopile.
Spectral range: 0.3 to 3 µ meters
Sensitivity : ~ 20 micro volts/W/M ².
Time constant : < 30 seconds.
Range : 0 – 1500 W/ Sq.m
Output : 0 to 25 milli volts .
C02 SENSOR:
Specifications:
Co2 range 0-2000 ppm Output
0-10 Vdc for CDK 010
4-20 mA for CDK 420
Optical NDIR sensor
(non-dispersive Infra-red technology)
Self Calibrating
Including duct mounting flange IP65 enclosure with quick-locking screws
VISIBILITY SENSOR:
Measures Visibility (MOR)
Output Serial data
Range (visibility) 10m to 40km
Measurement Error <=10% at 10 km
<=15% at 20 km
<=20% at 30 km
Measurement principle Forward scatter meter with 39° to 51°
Outputs and Reports Output rate (seconds) 30 to 300 (selectable)
Serial outputs RS232, RS422 and RS485
Data Acquisition System has the following features:
DT80 has18 bit resolution with a built-in display
Robust, Real-Time & Standalone, low power data logger
The capability of Remote Monitoring & Control using various communication methods such as RS232, RS485, GSM, Spread Spectrum
It has a Removable Terminal Base Assembly
It has User-definable memory allocation & mode
It comes with Easy Configurable Windows Based Software
The system will be able to transfer data continuously from the monitoring site to the central lab.
It has the capability of putting SMS alerts.
The system will be provided with battery backup so that in case of supply failure it will be automatically switched on to Battery.
A display will be provided separately which can show all the mentioned weather parameters continuously.
Analog Inputs:
5 -15 number of analog channels
DT 80 can measures voltage, current, resistance and frequency
Resolution up to 0.25 µV and 2.5 nA, 1.5 mΩ.
Accuracy 0.1%
There is isolation between the inputs
Input impedance > 100 MΩ programmable
Sampling Resolution: 18 bit
Linearity : 0.01 %
Facility to expand the number of channels to at least 300 channels.
One analog output.
Digital Channels:
12 Flexible Digital channels
8 Bi-directional channels for state & count input and state output
Digital Input Type: 8 logic level measures state or low-speed count
Digital Output type: 4 with open-drain FET
1 latching relay
It has 4 dedicated counters or 2 phase encoders
4 SDI – 12 inputs, shared with digital channels
2 channels are available and programmable for data to be logged from smart sensors with Host and Dedicated port
Memory:
Internal storage capacity is 128 MB i.e 100,00,000 data points which can be expanded 90,000 data points per 1MB using memory stick
DAQ system has up to11 numbers of schedules with schedule rates of 10 ms to days to program logging times and triggering facilities.
CEM 20(Channel expansion module).
CEM20
Channel expansion module.
Compact size.
Each CEM20 multiplexes 20 analog channels. In to one analog channel on the data logger.
One analog channel support three number of single ended channel.
20 analog input channels for sensors supported by DT80 range loggers, including thermocouples, VWSG, RTDs, 4-20mA loops, voltage, resistance, frequency, etc.
60 number single-ended channels.
40 number of differential channels.
Multiplexer.
Type: Relay multiplexer Maximum Input Voltage: 30Vdc Maximum Sampling Speed: 12Hz
POWER SUPPLY
Power Supply Recommended: Logger’s switched 12V output Alternative: External regulated 12Vdc ± 5% Power Consumption Sampling: 0.36W (12V 30mA) Idle: CEM20 is automatically turned off when not sampling.
Physical environment.
Physical and Environment Construction: Powder coated steel and anodized aluminium Dimensions: 180 x 100 x 50mm Weight: 0.55kg Temperature Range: -45°C to 70°C Humidity: 85% RH, non-condensing
Pyranometer
A pyranometer is a device used to measure the amount of irradiance that reaches the earth’s surface. As with almost any type of measurement device, there exists a broad range of pyranometers ranging from highly complex, expensive units to fairly inexpensive simple units. This article will explore two types thermopile and photodetector.
Sunshine Recorder
Sunshine recorders automatically registering time and duration of insolation are used at meteorological and climatological research centres, observatiories, spas and health resorts, in agriculture, horticulture, viticulture and vegetable gardening. The instruments are set up on flat roofs or on clear ground in such manner as to be well exposed to solar radiation, during the whole day.
The type of instrument to be chosen depends on the latitude of the place installation. This recorder consists essentially of a glass sphere mounted concentrially in a section of a spherical metal bowl, the diameter of which is such that the sun’s rays are focussed sharply on a card held in the grooves, in the bowl. Three overlapping pairs of grooves are provided in the bowl to taken up cards suitable for the different seasons of the year. The sphere is made of uniform and well annealed colourless glass and is carefully ground and polished with great precision.
