Ramkala Manufacturers Metal Cup Counter Anemometer, For Wind Speed

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  -  Copper Sheet/ Aluminium 0.71 Mm Thick
• Cup Arm & Socket  -  Aluminium Alloy
• Body & Lid  -  Cast Aluminium/ Brass
• Centre Spindle  -  Stainless Steel Rod
• Worm  -  Manganese Bronze Alloy
• Worm Wheel  -  Hard Brass
• Other Parts -  Made from Non Rusting 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

• General Description :
  
  • The wind speed is measured using anemometer. The instrument has a cup wheel consisting of three conical cups with beaded edges, free to rotate in a horizontal plane. The cup wheel spindle is connected by worm gearing to a revolution counter mounted inside a waterproof housing. The gear ratio between the cup and counter spindles is so chosen that the run of the wind is shown directly in kilometers.
  • The surface wind for synoptic purpose is reported in knots. To determine the wind speed at the time of observation, take two successive readings of the anemometer at an interval of three minutes. Subtract the first reading from the second one and multiply the difference by 20. This gives the mean wind speed over a period of three minutes in kilometers per hour. To obtain the mean windspeed in knots multiply this by 0.54.

Specifications :

• Material :
  
  • Cups - Copper or aluminium sheets 0.71 mm thickness
  • Centre spindle - Stainless steel rod
  • Worm on center spindle - Cut from manganese bronze alloy
  • Worm wheel - Hard brass

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 -

• Speed - Tolerance
• Below 10 km/h - ±1 kmph
• Above 10 km/h - ±10%