Meteorological Instruments

This is a Micro controller based Automatic Weather Station reflect state of the art in micro controller based low cost instrumentation design.

All sensors can be attached with this data logger for the collection of real time data automatically. The micro controller converts the analog signals from these sensors to digital format. The micro controller has their individual operating software’s programmed in their internal EEPROMS and the data acquired by them is stored in their internal data RAMS. This micro controller remains in the sleep mode and wake up only when either a signal from the sensors is available or when they receive control signals from the master controller for acquiring the stored data. The micro controller has its internal memory along with an additional 512K EEPROM, a real time clock with an LCD (16 X 2) to display the instrument status.

A cup anemometer is used to calculate the velocity of wind. The three flat aligned sphere-shaped cups, which are static at right angles or in a stellar form on the perpendicular axis of the cup anemometer, measure the breeze velocity.

It working principle is very simple the resilient the breeze blows, the quicker the partial open plastic cups move. The velocity of the cross revolution regulates the breeze speed. 

The cup anemometer measures the numeral of revolutions per minute and thus the breeze velocity very precisely. The breeze velocity can be expediently read out from the LCD show (28 x 19 mm) of the cup anemometer.

Measuring Range: 0 to 1200 meters per minute (approximately 0 to 72 km/h).

Accuracy: ±1% at 20 m/s wind speed (approximately 72 km/h).

Resolution: 0.1 km.

Starting Threshold: Wind speed of approximately 1.5 m/s (approximately 5.4 km/h).

Temperature Range: 0°C to 80°C.

Humidity: Up to 95% relative humidity.

A cup anemometer is used to calculate the velocity of wind. The three flat aligned sphere-shaped cups, which are static at right angles or in a stellar form on the perpendicular axis of the cup anemometer, measure the breeze velocity.

It working principle is very simple the resilient the breeze blows, the quicker the partial open plastic cups move. The velocity of the cross revolution regulates the breeze speed.

This PCE breeze flow meter, also denoted as the cup anemometer, proposals an important benefit in association to the typical impeller anemometers.

The breeze track is not of vital significance in the calculation of the movement rate. In instruction to be capable to finds the breeze velocity finely, the cup anemometer, an alteration to the impeller anemometer, does not have to be retained correctly in the breezeway.

The placement of the half cups in changed directions confirms that the cup stellar is fixed in indication free of the path. Thus, the flat and less weight cup responds to even the lowest movement speeds. With the perseverance of 0.1 m /seconds, the gaging assortment of the cup anemometer is from 0.9 m / s up to 35 m / s. There are dissimilar components for the movement speeds with m /second, km/hour, knots, miles/hour, ft/min accessible.

The cup anemometer measures the numeral of revolutions per minute and thus the breeze velocity very precisely. The breeze velocity can be expediently read out from the LCD show (28 x 19 mm) of the cup anemometer.

The anemometer of PCE Tools stocks extreme and least standards, which can be suitably delivered over on the display far ahead.

To confirm that the previous dimensions’ consequences showed can be observed again, the cup anemometer also has a concrete data grasp task. The calculation statistics are noted and stowed by a valuable 100 point statistics logger.

The cup anemometer is manifest IP 65, encounters all the circumstances, and is thus secure in contrast to the dispersion of dirt and humidity.

To save the battery of an anemometer to discharge when it is not in working condition, the meter has an auto power-off controller. After some meter turns off when it finished its working.

Lakshmi make Cup Type water current meter along with Micro-controller based Digital Water Velocity Indicator has-been designed to measure the Velocity of water in a flowing stream or open Canal. It comprises a Cup Type Water Current Meter & Microcontroller based Digital Water Velocity Indicator. Micro- controller calculates velocity of water as per the calibration equation provided with the Sensor and displayed on the 16x2 LCD display. You can save upto 56 readings. This instrument is portable, hand-held easy to use, Battery status indication, User Friendly Menu driven programmable functions. This instrument has a Cup type current meters are scaled two fifths as large as the standard type current meter, it does not have a tailing assembly and is used with the wading rod. Its range of operations is 0.3 to 3.3 meter per second. The 2 inch diameter bucket wheel contains cups a single contact closure is made each movement of the bucket wheel. The calibration chart provided with the meter gives the velocity in m/sec.

The amount of evaporation measured from open pan type evaporimeter is incorrect due to considerable amount of extraneous losses caused by birds, especially during the hot summer months in tropics, Electronic alarm device is designed to prevent the birds drinking or disturbing the water from the evaporimeter and to get reliable data of evaporation. The comparative study of reading from two evaporimeters, one with the electronic attachment and the other without it, clearly indicates the utility of the arrangement.

The evaporation pan of this standard set is made of stainless steel and has the dimensions of a “class A“ evaporation pan, namely 54 mm (10 inches) in height and 1206 mm (47.5 inches) in diameter. The evaporation pan is installed on the wooden support, which is set and levelled on the ground in a grassy location, away from bushes, trees and other obstacles which obstruct a natural air flow around the pan, thus representing open water in an open area.

Daily the result of evaporation and precipitation is measured within the still well, by means of a high quality evaporation micrometer with a measuring range of 100 mm and an accuracy of 0.02 mm. This accuracy can be obtained because the still well prevents rippling of the water surface.

The amount of evaporation is a function of temperature, humidity, wind and other ambient conditions. In order to relate the evaporation to wind current or expected conditions, the maximum and minimum temperature as well as the amount of air passed are recorded with the evaporation. For a more exact use of the evapora- tion pan it is recommended to use an additional wind path meter.

The A-55, 104-010, Sounding Reel is used to position stream gaging and sample collection equipment. The reel is used with weights up to 100 pounds (45 kg) and holds 75 feet (22.9 m) of 0.10-inch (0.25cm) cable. The reel can be mounted on Type A and Type E cranes, the bridge board, the sit-down or stand-up cable car, and the boat boom assembly.

The A-55 reel is equipped with a USGS-type computing depth indicator to read in English units. (see model A-55M for metric units). The computing depth indicator has a main dial graduated in feet. The numbered inner dial shows total depth. The main dial has a graduated spiral to indicate directly the 0.8 depth position. Additionally, each reel is equipped with a removable crank, 0.10-inch (0.25 cm) cable and electrical connections for two-conductor cables; and comes in a carrying case for ease of transporting. The reel is supplied with a pressed sleeve connector.

These screens are manufactured as per IS: 5948: 1970 and are suitable for housing, dry and wet bulb, Thermometer and Maximum-Minimum Thermometer. Basically these are manufactured from best quality Indian Wood and accurately assembled with side louvers.

The LEW Current Meter is a world recognised design instrument for measuring the velocity of water in shallow natural water courses, rivers, canals, and pipe line. The provides solutions for all velocity measuring applications.

One of the great features of the is it can be used with 20 mm diameter wading rod and relocating device, streamlined suspension tube, portable winches and permanent cableway installations, with streamlined or ground feeling weights. A tail fin assembly is provided to control directional stability during suspended measurements.

The comes with lots of accessories which enable the user to endure water flow measurement easily and accurately.