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Open Pan Evaporimeter is used to calculate the evaporation loss of water in the atmosphere. It consists of Copper / Galvanize Pan, Wire Mesh, Fixed Point gauge, Measuring Cylinder, Thermometer & Wooden Platform. The Pan Evaporimeter consists of a cylindrical reservoir of Fixed diameter & depth is filled with water to a few centimeters below the rim. A fixed point gauge in a stilling well serves to indicate the level of water in the pan. A calibrated measuring cylinder is used to add or remove water at each observation to bring the water level to the fixed point. The cross - sectional area of the measuring cylinder is such that the number of millimeters of water added from the measuring cylinder divided by 100 gives the amount of water in millimeters which has evaporated from the pan during a given interval of time. The reservoir is covered with wire-mesh netting to protect the pan from birds & animals. A thermometer records the temperature of the water in the pan
Material
Specifications :
Dimensions : The dimensions of the pan evaporimeter shall be as given in figs. 8.1, 8.2, 8.3 and 8.4
The Cup Counter Anemometer is used for measuring the wind speed. The instrument has a cup wheel comprising of three conical cups with bedded edges and free to rotate in a horizontal plane. The cup wheel spindle is connected by worm gearing to a revolution counter mounted inside a water proof housing. The gear ratio between the cup and counter spindles is so chosen that the run of the wind is shown directly in kilometers and tenths. The counter mechanism has five figures and reads upto 9999.9 km. before repeating itself
Material :
Cup Rotar Assembly : Each of the three rotor cups shall have an internal Dia. of exactly 127.0 mm and be semi conical in shape. The spindle is supported on two bearings, ball bearing at top & thrust bearing at bottom. The assembly is made as per the instruction laid in IS - 5912
Worm & Worm Wheel : The worm wheel shall engage true with the threads on the worm without friction. The worm wheel shall be secured to the shaft of the counter by means of a steel pin. The gearing ratio shall be such that 32 revolutions of cup rotor produce one revolution of the worm wheel.
Body & Lid : The body and the lid are made from Aluminium casting and glass window only viewing the five figure wheels of counter. Each anemometer will be supplied with 18" long M.S. bar for fixing in concrete.
Counter : It is a non-reset, direct drive revolution counter adding one counter for each one tenth revolution. The figures of the counter shall be 7mm high is of white pigment colour on black background.
Anemometer
Specifications :
Dimension : The general arrangement and dimensions of the cup counter anemometer shall be as shown in fig. 7.1.
Counter : Any suitable non reset direct-drive revolution counter adding one count for each one-tenth revolution of the drive shaft in one direction or ten units for each complete revolution shall be used.
Accuracy : When tested in a wind tunnel, the speeds calculated from the readings of the anemometer counter shall agree with the true speeds within tolerances specified below -
Additional Information:
Payment Terms : L/C,
Packaging Details : Corogated Box
Delivery Time : 8 days
General Description : Thermometer screens are used for mounting the various meteorological thermometers. A screen should be, as far as possible, be designed to provide an enclosure with a uniform temperature the same as that of outside air. It should completely surround the thermometers and should exclude radiant heat and precipitation. The walls of such a screen should preferably be double-louvered and the floor should be made of staggered boards, but other types of construction may be found to meet the above requirements. The roof should be double-layered, with provision for ventilation of the space between the two layers.
Specifications : Two types of thermometer screens are available.
Dimensions :
All dimensions within ±5%. The screen should be constructed with seasoned teak or deodar wood and painted with non-hygroscopic zinc oxide paint. Refer figs. 4.1 and 4.2.
A Wind vane is used for indicating the direction from which the wind is blowing. A Wind vane consists of a horizontal Arm carrying a rectangular flat fin mounted by means of thrust rod and brass bushes in a support. The horizontal arm is balanced about its axis of rotation by counter weight attached to the end opposite to the fin. The vane and eight direction rods are supported on a suitable galvanized iron pipe threaded into a base. Casting Four direction arms carry the letter N, E, S & W which point towards the corresponding true direction while four direction rods indicate the intermediate directions. The position of the counter weight with respect to the eight direction arms indicate the wind direction and may easily be determined by interpolation to the nearest sixteen points of the compass.
Details :
General Description :
Surface wind is best measured by a wind vane and anemometer. Wind direction should be reported to the nearest ten degrees. Wind direction is defined as the direction from which the wind blows and is measured clockwise from geographical north. The windvane consists of a metal sheet of rectangular form fastened to a metal rod, pivoted and capable of rotating around a vertical axis with a minimum of friction. The weight of the metal sheet is balanced by a metal counter weight at the other end of the rod.
For the purpose of obtaining a satisfactory measurement, a windvane will be suitable if it is well balanced so as not to have a preferred position in case the axis is not vertical and if it is sufficiently well designed to have single equilibrium position with respect to each wind direction.
Dimensions : The general arrangment and main dimensions of windvane shall be as shown in figs. 6.1. and 6.2.
Accuracy : When the complete instrument on final assembly is held firm at bottom and the balance weight imparted an impact by a hammer weighing 0.72 Kg and having a handle length of 240 mm, it shall make not less than five and not more than ten complete revolutions.
Additional Information:
Payment Terms : L/C,
Packaging Details : Corogated Box
Delivery Time : 8 days
Specifications Of Material
The material used for the fabrication of the wind instrument shall be such that it may withstand permanent exposure in the open and have a long life extending over a number of years. Suitable materials for the various components of the instrument are suggested below :
Material | Component |
---|---|
Aluminium | Base, mounting ring for direction arms, collar, arm support and horizontal arm. |
Aluminium alloy | Fin andl bearing housing cap |
Aluminium casting | Support tube |
Brass | Spindle and cap nut · |
Galvanissd steal | Main support and direction letter |
Mild steel | Balance weight and direction letter |
Tin bronze | Bearing brush |
Thermometers
Specifications : The thermometers shall be of liquid-in-glass, solid-stem type with enamel back as follows :
The graduation intervals for all the thermometers should be 0.5oc. The accuracy of ordinary thermometers, maximum thermometers and soil thermometers should be +0.2oC and for minimum thermometers it sh ould be 0.3oc
The thermometers should be suitably mounted as per drawings given in IS:5681 1983. Each mounted thermometer with mount may be supplied in a wooden case with a hinged lid, of outer dimensions 400 x 110 x 65 mm. The thermometer with its mount shall be fixed to the box with two brass screws.
Additional Information:
Payment Terms : L/C,
Packaging Details : Corogated Box
Delivery Time : 8 days
Sunshine recorder consists of a glass sphere mounted concentrically in a section of spherical bowl, the diameter of which is such that when the instrument is exposed to the sun's rays, they are focused sharply on a card held in grooves in the bowl. Three overlapping pairs of grooves are provided in the bowl cards suitable for different seasons of the year. The sharply focused sun's rays burn a trace on the card which has a time scale printed on it. The length of the burn indicates the period of bright sunshine during the day.
Specifications :
Sunshine cards Properties and dimensions of sunshine cards are given in Appendix A of IS - 7243-1974.
The Sunshine Recorder is used for the accurate measurement of the duration of bright sunshine at a place. The Sunshine Recorder consists of a glass sphere mounted concentrically in a section of a spherical bowl. Three overlapping grooves are provided in the bowl to take cards suitable for different seasons of the year. The instruments is mounted on heavy base, The scale of degree of latitude from -5 to 45 Degree. The sphere support with the glass sphere and bowl can be tilted, adjusted and clamped at an angle to suit the latitude of the station. The focused Sun's rays burn a trace on the card to indicate the period of bright sunshine during the day.
Details :
Sunshine :
Campbell-Stokes sunshine recorder :
General Description : Sunshine recorder consists of a glass sphere mounted concentrically in a section of spherical bowl, the diameter of which is such that when the instrument is exposed to the sun's rays, they are focused sharply on a card held in grooves in the bowl. Three overlapping pairs of grooves are provided in the bowl cards suitable for different seasons of the year. The sharply focused sun's rays burn a trace on the card which has a time scale printed on it. The length of the burn indicates the period of bright sunshine during the day.
Specifications :
Sunshine cards Properties and dimensions of sunshine cards are given in Appendix A of IS: 7243-1974.
Additional Information:
Payment Terms : L/C,
Delivery Time : 45 days